Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Notes Payable [Line Items]    
Fixed rate mortgages $ 820,068 $ 789,776
Scheduled maturity period 9 years 9 months 15 days [1]  
Total notes payable 820,068 827,776
Interest rate during period 5.53% [1]  
Fixed Rate Mortgage Notes Payable
    
Notes Payable [Line Items]    
Fixed rate mortgages 789,872 774,831
Interest rate 5.67% [1]  
Scheduled maturity period 10 years 1 month 0 days [1]  
Fixed Rate Mortgage Notes Payable | 7.67% due October 2012
    
Notes Payable [Line Items]    
Fixed rate mortgages 0 [2] 15,750
Fixed Rate Mortgage Notes Payable | 6.12% due January 2013
    
Notes Payable [Line Items]    
Fixed rate mortgages 0 [3] 6,936
Fixed Rate Mortgage Notes Payable | 7.88% due January 2013
    
Notes Payable [Line Items]    
Fixed rate mortgages 0 [4] 13,875
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015
    
Notes Payable [Line Items]    
Fixed rate mortgages 16,128 [5] 16,798
Interest rate 7.45%  
Scheduled maturity   2015-06
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018
    
Notes Payable [Line Items]    
Fixed rate mortgages 33,246 [6] 34,373
Interest rate 6.01%  
Scheduled maturity   2018-02
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019
    
Notes Payable [Line Items]    
Fixed rate mortgages 36,937 [7] 38,388
Interest rate 5.88%  
Scheduled maturity   2019-01
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019
    
Notes Payable [Line Items]    
Fixed rate mortgages 11,949 [8] 12,418
Interest rate 5.76%  
Scheduled maturity   2019-05
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019
    
Notes Payable [Line Items]    
Fixed rate mortgages 16,501 [9] 17,145
Interest rate 5.62%  
Scheduled maturity   2019-07
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019
    
Notes Payable [Line Items]    
Fixed rate mortgages 16,419 [10] 17,040
Interest rate 5.79%  
Scheduled maturity   2019-09
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020
    
Notes Payable [Line Items]    
Fixed rate mortgages 14,610 [11] 15,176
Interest rate 5.22%  
Scheduled maturity   2020-01
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020
    
Notes Payable [Line Items]    
Fixed rate mortgages 11,159 [12] 11,421
Interest rate 5.60%  
Scheduled maturity   2020-05
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020
    
Notes Payable [Line Items]    
Fixed rate mortgages 9,921 [13] 10,288
Interest rate 5.30%  
Scheduled maturity   2020-06
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020
    
Notes Payable [Line Items]    
Fixed rate mortgages 42,462 [14] 43,424
Interest rate 5.83%  
Scheduled maturity   2020-07
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021
    
Notes Payable [Line Items]    
Fixed rate mortgages 8,649 [15] 8,934
Interest rate 5.81%  
Scheduled maturity   2021-02
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021
    
Notes Payable [Line Items]    
Fixed rate mortgages 6,233 [16] 6,359
Interest rate 6.01%  
Scheduled maturity   2021-08
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022
    
Notes Payable [Line Items]    
Fixed rate mortgages 35,981 [17] 36,699
Interest rate 5.62%  
Scheduled maturity   2022-06
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022
    
Notes Payable [Line Items]    
Fixed rate mortgages 10,930 [18] 11,129
Interest rate 6.08%  
Scheduled maturity   2022-09
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023
    
Notes Payable [Line Items]    
Fixed rate mortgages 11,795 [19] 11,989
Interest rate 6.43%  
Scheduled maturity   2023-04
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024
    
Notes Payable [Line Items]    
Fixed rate mortgages 15,598 [20] 16,247
Interest rate 6.28%  
Scheduled maturity   2024-02
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024
    
Notes Payable [Line Items]    
Fixed rate mortgages 17,123 [21] 17,469
Interest rate 7.35%  
Scheduled maturity   2024-06
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024
    
Notes Payable [Line Items]    
Fixed rate mortgages 14,849 [22] 15,140
Interest rate 7.60%  
Scheduled maturity   2024-06
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024
    
Notes Payable [Line Items]    
Fixed rate mortgages 26,153 [23] 26,635
Interest rate 7.02%  
Scheduled maturity   2024-07
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024
    
Notes Payable [Line Items]    
Fixed rate mortgages 31,093 [24] 31,709
Interest rate 7.45%  
Scheduled maturity   2024-07
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025
    
Notes Payable [Line Items]    
Fixed rate mortgages 30,894 [25] 31,490
Interest rate 7.30%  
Scheduled maturity   2025-01
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026
    
Notes Payable [Line Items]    
Fixed rate mortgages 16,087 [26] 16,419
Interest rate 6.18%  
Scheduled maturity   2026-01
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026
    
Notes Payable [Line Items]    
Fixed rate mortgages 118,128 [27] 120,822
Interest rate 5.31%  
Scheduled maturity   2026-04
Fixed Rate Mortgage Notes Payable | 4.30% due October2026
    
Notes Payable [Line Items]    
Fixed rate mortgages 36,075 [28] 36,986
Interest rate 4.30%  
Scheduled maturity   2026-10
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026
    
Notes Payable [Line Items]    
Fixed rate mortgages 40,974 [29] 41,970
Interest rate 4.53%  
Scheduled maturity   2026-11
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026
    
Notes Payable [Line Items]    
Fixed rate mortgages 19,118 [30] 19,569
Interest rate 4.70%  
Scheduled maturity   2026-12
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027
    
Notes Payable [Line Items]    
Fixed rate mortgages 70,856 [31] 72,233
Interest rate 5.84%  
Scheduled maturity   2027-05
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028
    
Notes Payable [Line Items]    
Fixed rate mortgages 17,718 [32] 0
Interest rate 4.04%  
Scheduled maturity   2028-04
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028
    
Notes Payable [Line Items]    
Fixed rate mortgages 34,391 [33] 0
Interest rate 3.51%  
Scheduled maturity   2028-06
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028
    
Notes Payable [Line Items]    
Fixed rate mortgages 17,895 [34] 0
Interest rate 3.99%  
Scheduled maturity   2028-09
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032
    
Notes Payable [Line Items]    
Fixed rate mortgages 0 [35] 0
Interest rate 4.88%  
Scheduled maturity   2032-09
Variable Rate Loans Payable
    
Notes Payable [Line Items]    
Variable rate loans 30,196 52,945
Interest rate spread on LIBOR 1.65%  
Scheduled maturity period 2 years 2 months 0 days [1]  
Variable Rate Loans Payable | Revolving credit facility
    
Notes Payable [Line Items]    
Scheduled maturity 2016-05  
Variable rate loans 0 [36] 38,000
Interest rate spread on LIBOR 1.60%  
Variable Rate Loans Payable | Northrock loan
    
Notes Payable [Line Items]    
Scheduled maturity 2016-02  
Variable rate loans 14,802 [37] 14,945
Interest rate spread on LIBOR 1.65%  
Variable Rate Loans Payable | Metro Pike Center bank loan
    
Notes Payable [Line Items]    
Scheduled maturity 2016-02  
Variable rate loans $ 15,394 [38] $ 0
Interest rate spread on LIBOR 1.65%  
[1] Interest rate and scheduled maturity data presented as of December 31, 2013. Totals computed using weighted averages.
[2] The loan, together with a corresponding interest-rate swap, was collateralized by, Metro Pike Center, and on a combined basis, required equal monthly payments of $86,000 based upon a 25-year amortization schedule and a final payment of $15.6 million at loan maturity. The loan was repaid in full and the swap was terminated in 2013.
[3] The loan was collateralized by Cruse MarketPlace and required equal monthly principal and interest payments of $56,000 based upon an amortization schedule of approximately 24 years and a final payment of $6.8 million at loan maturity. The loan was paid in full in 2013.
[4] The loan was collateralized by Seabreeze Plaza and required equal monthly principal and interest payments totaling $102,000 based upon a weighted average 26-year amortization schedule and a final payment of $13.3 million at loan maturity. The loan was paid in full in 2013.
[5] The loan is collateralized by Shops at Fairfax and Boulevard shopping centers and requires equal monthly principal and interest payments totaling $156,000 based upon a weighted average 23-year amortization schedule and a final payment of $15.2 million is due at loan maturity. Principal of $670,000 was amortized during 2013.
[6] The loan is collateralized by Washington Square and requires equal monthly principal and interest payments of $264,000 based upon a 27.5-year amortization schedule and a final payment of $28.0 million at loan maturity. Principal of $1.1 million was amortized during 2013.
[7] The loan is collateralized by three shopping centers, Broadlands Village, The Glen and Kentlands Square I, and requires equal monthly principal and interest payments of $306,000 based upon a 25-year amortization schedule and a final payment of $28.4 million at loan maturity. Principal of $1.5 million was amortized during 2013.
[8] The loan is collateralized by Olde Forte Village and requires equal monthly principal and interest payments of $98,000 based upon a 25-year amortization schedule and a final payment of $9.0 million at loan maturity. Principal of $469,000 was amortized during 2013.
[9] The loan is collateralized by Countryside and requires equal monthly principal and interest payments of $133,000 based upon a 25-year amortization schedule and a final payment of $12.3 million at loan maturity. Principal of $644,000 was amortized during 2013.
[10] The loan is collateralized by Briggs Chaney MarketPlace and requires equal monthly principal and interest payments of $133,000 based upon a 25-year amortization schedule and a final payment of $12.2 million at loan maturity. Principal of $621,000 was amortized during 2013.
[11] The loan is collateralized by Shops at Monocacy and requires equal monthly principal and interest payments of $112,000 based upon a 25-year amortization schedule and a final payment of $10.6 million at loan maturity. Principal of $566,000 was amortized during 2013.
[12] The loan is collateralized by Boca Valley Plaza and requires equal monthly principal and interest payments of $75,000 based upon a 30-year amortization schedule and a final payment of $9.1 million at loan maturity. Principal of $262,000 was amortized during 2013.
[13] The loan is collateralized by Palm Springs Center and requires equal monthly principal and interest payments of $75,000 based upon a 25-year amortization schedule and a final payment of $7.1 million at loan maturity. Principal of $367,000 was amortized during 2013.
[14] The loan and a corresponding interest-rate swap closed on June 29, 2010 and are collateralized by Thruway. On a combined basis, the loan and the interest-rate swap require equal monthly principal and interest payments of $289,000 based upon a 25-year amortization schedule and a final payment of $34.8 million at loan maturity. Principal of $962,000 was amortized during 2013.
[15] The loan is collateralized by Jamestown Place and requires equal monthly principal and interest payments of $66,000 based upon a 25-year amortization schedule and a final payment of $6.1 million at loan maturity. Principal of $285,000 was amortized during 2013.
[16] The loan is collateralized by Hunt Club Corners and requires equal monthly principal and interest payments of $42,000 based upon a 30-year amortization schedule and a final payment of $5.0 million, at loan maturity. Principal of $126,000 was amortized during 2013.
[17] The loan is collateralized by Lansdowne Town Center and requires monthly principal and interest payments of $230,000 based on a 30-year amortization schedule and a final payment of $28.2 million at loan maturity. Principal of $718,000 was amortized during 2013.
[18] The loan is collateralized by Orchard Park and requires equal monthly principal and interest payments of $73,000 based upon a 30-year amortization schedule and a final payment of $8.6 million at loan maturity. Principal of $199,000 was amortized during 2013.
[19] The loan is collateralized by BJ’s Wholesale and requires equal monthly principal and interest payments of $80,000 based upon a 30-year amortization schedule and a final payment of $9.3 million at loan maturity. Principal of $194,000 was amortized during 2013.
[20] The loan is collateralized by Great Falls shopping center. The loan consists of three notes which require equal monthly principal and interest payments of $138,000 based upon a weighted average 26-year amortization schedule and a final payment of $6.3 million at maturity. Principal of $649,000 was amortized during 2013.
[21] The loan is collateralized by Leesburg Pike and requires equal monthly principal and interest payments of $135,000 based upon a 25-year amortization schedule and a final payment of $11.5 million at loan maturity. Principal of $346,000 was amortized during 2013.
[22] The loan is collateralized by Village Center and requires equal monthly principal and interest payments of $119,000 based upon a 25-year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $291,000 was amortized during 2013.
[23] The loan is collateralized by White Oak and requires equal monthly principal and interest payments of $193,000 based upon a 24.4 year weighted amortization schedule and a final payment of $18.5 million at loan maturity. The loan was previously collateralized by Van Ness Square. During 2012, the Company substituted White Oak as the collateral and borrowed an additional $10.5 million. Principal of $482,000 was amortized during 2013.
[24] The loan is collateralized by Avenel Business Park and requires equal monthly principal and interest payments of $246,000 based upon a 25-year amortization schedule and a final payment of $20.9 million at loan maturity. Principal of $616,000 was amortized during 2013.
[25] The loan is collateralized by Ashburn Village and requires equal monthly principal and interest payments of $240,000 based upon a 25-year amortization schedule and a final payment of $20.5 million at loan maturity. Principal of $596,000 was amortized during 2013.
[26] The loan is collateralized by Ravenwood and requires equal monthly principal and interest payments of $111,000 based upon a 25-year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $332,000 was amortized during 2013.
[27] The loan is collateralized by Clarendon Center and requires equal monthly principal and interest payments of $753,000 based upon a 25-year amortization schedule and a final payment of $70.5 million at loan maturity. Principal of $2.7 million was amortized during 2013.
[28] The loan is collateralized by Severna Park MarketPlace and requires equal monthly principal and interest payments of $207,000 based upon a 25-year amortization schedule and a final payment of $20.3 million at loan maturity. Principal of $911,000 was amortized during 2013.
[29] The loan is collateralized by Kentlands Square II and requires equal monthly principal and interest payments of $240,000 based upon a 25-year amortization schedule and a final payment of $23.1 million at loan maturity. Principal of $996,000 was amortized during 2013.
[30] The loan is collateralized by Cranberry Square and requires equal monthly principal and interest payments of $113,000 based upon a 25-year amortization schedule and a final payment of $10.9 million at loan maturity. Principal of $451,000 was amortized during 2013.
[31] The loan in the original amount of $73.0 million closed in May 2012, is collateralized by Seven Corners and requires equal monthly principal and interest payments of $463,200 based upon a 25-year amortization schedule and a final payment of $42.3 million at loan maturity. Principal of $1.4 million was amortized during 2013.
[32] The loan is collateralized by Hampshire Langley and requires equal monthly principal and interest payments of $95,400 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $282,000 was amortized in 2013.
[33] The loan is collateralized by Beacon Center and requires equal monthly principal and interest payments of $203,200 based upon a 20-year amortization schedule and a final payment of $11.4 million at loan maturity. Principal of $609,000 was amortized in 2013.
[34] The loan is collateralized by Seabreeze Plaza and requires equal monthly principal and interest payments of $94,900 based upon a 25-year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $105,000 was amortized in 2013.
[35] The loan is a $71.6 million construction-to-permanent facility that is collateralized by and will finance a portion of the construction costs of Park Van Ness. During the construction period, interest will be funded by the loan. After conversion to a permanent loan, monthly principal and interest payments totaling $413,500 will be required based upon a 25-year amortization schedule. A final payment of $39.6 million will be due at maturity.
[36] The loan is a $175.0 million unsecured revolving credit facility. Interest accrues at a rate equal to the sum of one-month LIBOR plus a spread of 1.90%. The line may be extended at the Company’s option for one year with payment of a fee of 0.20%. Monthly payments, if required, are interest only and vary depending upon the amount outstanding and the applicable interest rate for any given month.
[37] The loan is collateralized by Northrock and requires monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. Principal of $161,000 was amortized during 2013.
[38] The loan is collateralized by Metro Pike Center and requires monthly principal and interest payments of approximately $48,000 and a final payment of $14.8 million at loan maturity. Principal of $206,000 was amortized during 2013.