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Derivative Instruments - Summary of Amounts Recognized on Consolidated Statements of Operations Related to Company's Derivatives (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items]    
Gain on derivative instruments-unrealized $ 72 $ (5)
Total   (417)
Interest rate swaps [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Loss on derivative instruments-realized (72) (412)
Gain on derivative instruments-unrealized 72 147
Interest rate caps [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Loss on derivative instruments-unrealized   $ (152)