Derivatives and Hedging Activities - Summary of Cash Flow Hedge Instruments (Detail) - Cash flow hedge instruments [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Notional Amount, Derivative assets	$ 367,330	$ 281,055
Notional Amount, Derivative liabilities	47,447	0
Notional Amount, Total	414,777	281,055
Fair Value, Derivative assets	16,027	8,404
Fair Value, Derivative liabilities	(813)	0
Fair Value, Total	15,214	8,404
Accumulated other comprehensive income (loss) [Member]
Derivatives, Fair Value [Line Items]
Fair Value, Derivative assets	34,578	8,480
Fair Value, Derivative liabilities	(19,709)	0
Fair Value, Total	14,869	$ 8,480
Net gain related to cash flow hedges recorded in accumulated other comprehensive income (loss) that is expected to be recognized in next 12 months	$ 12,940