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Fair Value Disclosure of Financial Instruments - Additional Information (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable $ 1,671,442,000 $ 1,653,646,000
Fixed Rate Debt
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable Excluding Interest Rate Swaps and Cap Agreements 748,759,000 732,382,000
Notes Payable, fair value 783,800,000 777,847,000
Variable Rate Debt
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable Excluding Interest Rate Swaps and Cap Agreements 922,683,000 921,265,000
Notes Payable, fair value $ 856,688,000 $ 850,581,000