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Indebtedness - Summary of Indebtedness at Estimated Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Mortgage Loans Payable, Net, Carrying Amount $ 730,421 $ 763,616
Senior Unsecured Notes, Net, Carrying Amount 445,925 474,150
Unsecured Credit Facility, Carrying Amount 108,000 98,000
Total, Carrying Amount 1,284,346 1,335,766
Mortgage Loans Payable, Net, Fair Value 750,077 814,915
Senior Unsecured Notes, Net, Fair Value 481,764 516,943
Unsecured Credit Facility, Fair Value 108,400 98,192
Total, Fair Value $ 1,340,241 $ 1,430,050