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Derivatives - Schedule of Change in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Income [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives $ (274) $ (345) $ 1,428
Other Income [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives 64 10 0
Interest Income [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) on derivatives $ 2,049 $ 330 $ 0