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Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Parenthetical) (Detail) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2013
Metro Pike Center
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Dec. 31, 2013
White Oak Shopping Center
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Dec. 31, 2013
Beacon Center
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Dec. 31, 2013
Northrock
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Dec. 31, 2012
7.67% due October 2012
Metro Pike Center
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Dec. 31, 2012
6.12% due January 2013
Cruse Market Place
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Dec. 31, 2012
7.88% due January 2013
Seabreeze Plaza
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Dec. 31, 2013
7.45% due June 2015
Shops at Fairfax and Boulevard
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Dec. 31, 2013
6.01% due February 2018
Washington Square
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Dec. 31, 2013
5.88% due January 2019
Broadlands Village, The Glen and Kentlands Square I
Store
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Dec. 31, 2013
5.76% due May 2019
Olde Forte Village
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Dec. 31, 2013
5.62% due July 2019
Countryside
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Dec. 31, 2013
5.79% due September 2019
Briggs Chancy MarketPlace
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Dec. 31, 2013
5.22% due January 2020
Shops at Monocacy
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Dec. 31, 2013
5.60% due May 2020
Boca Valley Plaza
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Dec. 31, 2013
5.30% due June 2020
Palm Springs Center
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Dec. 31, 2013
5.83% due July 2020
Thruway
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Dec. 31, 2013
5.81% due February 2021
Jamestown Place
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Dec. 31, 2013
6.01% due August 2021
Hunt Club Corners
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Dec. 31, 2013
5.62% due June 2022
Landsowne Town Center
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Dec. 31, 2013
6.08% due September 2022
Orchard Park
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Dec. 31, 2013
6.43% due April 2023
BJs Wholesale
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Dec. 31, 2013
6.28% due February 2024
Great Falls Shopping Center
Note
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Dec. 31, 2013
7.35% due June 2024
Leesburg Pike
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Dec. 31, 2013
7.60% due June 2024
Village Center
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Dec. 31, 2013
7.02% due July 2024
White Oak Shopping Center
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Dec. 31, 2013
7.45% due July 2024
Avenel Business Park
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Dec. 31, 2013
7.30% due January 2025
Ashburn Village
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Dec. 31, 2013
6.18% due January 2026
Ravenwood
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Dec. 31, 2013
5.31% due April 2026
Clarendon Center
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Sep. 23, 2011
4.30% due October2026
Severna Park Market Place
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Dec. 31, 2013
4.30% due October2026
Severna Park Market Place
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Dec. 31, 2013
4.53% due November 2026
Kentlands Square II
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Dec. 31, 2013
4.70% due December 2026
Cranberry Square
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Dec. 31, 2013
5.84% due May 2027
Seven Corners
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Dec. 31, 2013
4.04% due April 2028
Hampshire Langley
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Dec. 31, 2013
3.51% due June 2028
Beacon Center
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Dec. 31, 2013
3.99% due September 2028
Seabreeze Plaza
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Oct. 25, 2013
4.88% due September 2032
Park Van Ness
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Dec. 31, 2013
4.88% due September 2032
Park Van Ness
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Dec. 31, 2013
Revolving credit facility
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Dec. 31, 2013
Revolving credit facility
One-month LIBOR
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Dec. 31, 2013
Northrock loan
Northrock
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| Notes Payable [Line Items] | |||||||||||||||||||||||||||||||||||||||||||
| Principal and interest payments | $ 48,000 | $ 86,000 | $ 56,000 | $ 102,000 | $ 156,000 | $ 264,000 | $ 306,000 | $ 98,000 | $ 133,000 | $ 133,000 | $ 112,000 | $ 75,000 | $ 75,000 | $ 289,000 | $ 66,000 | $ 42,000 | $ 230,000 | $ 73,000 | $ 80,000 | $ 138,000 | $ 135,000 | $ 119,000 | $ 193,000 | $ 246,000 | $ 240,000 | $ 111,000 | $ 753,000 | $ 207,000 | $ 240,000 | $ 113,000 | $ 463,200 | $ 95,400 | $ 203,200 | $ 94,900 | $ 413,500 | $ 47,000 | |||||||
| Amortization period | 25 years | 25 years | 20 years | 25 years | 25 years | 24 years | 26 years | 23 years | 27 years 6 months | 25 years | 25 years | 25 years | 25 years | 25 years | 30 years | 25 years | 25 years | 25 years | 30 years | 30 years | 30 years | 30 years | 26 years | 25 years | 25 years | 24 years 4 months 24 days | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 25 years | 20 years | 25 years | 25 years | 25 years | |||
| Debt instrument final payment | 14,800,000 | 18,500,000 | 14,200,000 | 15,600,000 | 6,800,000 | 13,300,000 | 15,200,000 | 28,000,000 | 28,400,000 | 9,000,000 | 12,300,000 | 12,200,000 | 10,600,000 | 9,100,000 | 7,100,000 | 34,800,000 | 6,100,000 | 5,000,000 | 28,200,000 | 8,600,000 | 9,300,000 | 6,300,000 | 11,500,000 | 10,100,000 | 18,500,000 | 20,900,000 | 20,500,000 | 10,100,000 | 70,500,000 | 20,300,000 | 23,100,000 | 10,900,000 | 42,300,000 | 9,500,000 | 11,400,000 | 9,500,000 | 39,600,000 | 14,200,000 | |||||
| Amortization of principal | 206,000 | 670,000 | 1,100,000 | 1,500,000 | 469,000 | 644,000 | 621,000 | 566,000 | 262,000 | 367,000 | 962,000 | 285,000 | 126,000 | 718,000 | 199,000 | 194,000 | 649,000 | 346,000 | 291,000 | 482,000 | 616,000 | 596,000 | 332,000 | 2,700,000 | 911,000 | 996,000 | 451,000 | 1,400,000 | 282,000 | 609,000 | 105,000 | 161,000 | |||||||||||
| Number of shopping centers | 3 | ||||||||||||||||||||||||||||||||||||||||||
| Number of notes | 3 | ||||||||||||||||||||||||||||||||||||||||||
| Debt instrument amount | $ 15,600,000 | $ 10,500,000 | $ 15,000,000 | $ 10,500,000 | $ 125,000,000 | $ 38,000,000 | $ 43,000,000 | $ 20,000,000 | $ 73,000,000 | $ 18,000,000 | $ 35,000,000 | $ 18,000,000 | $ 71,580,000 | $ 175,000,000 | |||||||||||||||||||||||||||||
| Interest rate spread on LIBOR | 1.65% | 1.65% | 1.90% | ||||||||||||||||||||||||||||||||||||||||
| Debt maturity extension period | 1 year | ||||||||||||||||||||||||||||||||||||||||||
| Debt instrument fee | 0.20% | ||||||||||||||||||||||||||||||||||||||||||
| Debt instrument frequency of periodic payment | Monthly | ||||||||||||||||||||||||||||||||||||||||||