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Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]                      
Total $ (2) $ (87) $ (65) $ (417) $ (18) $ (677) $ (2,019) $ 18 $ (572) $ (2,696) $ (94)
Interest rate swaps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Loss on derivative instruments-realized                 (895) (1,831)  
Loss on derivative instruments-unrealized                 510 763  
Interest rate caps [Member]
                      
Derivative Instruments, Gain (Loss) [Line Items]                      
Loss on derivative instruments-unrealized                 $ 187 $ 1,628