Debt Maturities of Mortgages and Notes Payable, Including Balloon Payments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Scheduled Principal Payments For Borrowings [Line Items]    
Total $ 3,873,659 $ 3,778,218
Remaining average maturity of outstanding debt 4 years 8 months 12 days  
Mortgages and Notes Payable
   
Scheduled Principal Payments For Borrowings [Line Items]    
Remainder of 2014 72,481  
2015 303,917  
2016 941,218  
2017 970,909  
2018 294,296  
Thereafter 1,290,098  
Total 3,872,919  
Mortgages and Notes Payable | Scheduled Principal
   
Scheduled Principal Payments For Borrowings [Line Items]    
Remainder of 2014 42,720  
2015 58,123  
2016 51,888  
2017 45,745  
2018 45,445  
Thereafter 134,285  
Total 378,206  
Mortgages and Notes Payable | Balloon Payment
   
Scheduled Principal Payments For Borrowings [Line Items]    
Remainder of 2014 29,761  
2015 245,794  
2016 889,330  
2017 925,164  
2018 248,851  
Thereafter 1,155,813  
Total 3,494,713  
Mortgages and Notes Payable | 2019
   
Scheduled Principal Payments For Borrowings [Line Items]    
Thereafter 49,500  
Mortgages and Notes Payable | 2020
   
Scheduled Principal Payments For Borrowings [Line Items]    
Thereafter 294,500  
Mortgages and Notes Payable | 2021
   
Scheduled Principal Payments For Borrowings [Line Items]    
Thereafter 167,500  
Mortgages and Notes Payable | 2022
   
Scheduled Principal Payments For Borrowings [Line Items]    
Thereafter 292,200  
Mortgages and Notes Payable | 2023
   
Scheduled Principal Payments For Borrowings [Line Items]    
Thereafter $ 352,100