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Interest Rate Caps - Summary of Change in Rate Caps (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2015
Offsetting [Abstract]    
Balance at beginning of period $ 405  
Purchases   $ 577
Fair value adjustment included as an (increase) in interest expense (247) (419)
Balance at end of period, included in other assets $ 158 $ 158