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Interest Rate Caps - Summary of Change in Rate Caps (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Offsetting [Abstract]    
Balance at beginning of period $ 120  
Purchases 112 $ 577
Fair value adjustment included as an (increase) in interest expense (170) (457)
Balance at end of period, included in other assets $ 62 $ 120