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Gains and Losses Related to Derivative Financial Instruments Designated as Hedging Instruments (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Designated as Hedging Instrument | Interest Rate Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (Loss) recognized in OCI $ (381) $ (4) $ (658) $ 10