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Gains and Losses Related to Derivative Financial Instruments Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Designated as Hedging Instrument | Interest Rate Contract    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) recognized in OCI $ 13 $ (43)