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Gains and Losses Related to Derivative Financial Instruments Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Designated as Hedging Instrument | Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) recognized in OCI $ 17 $ (2) $ 13