Commitments and Contingencies - Gains (Losses) Related to Interest Rate Derivatives Designated as Hedges of Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Derivative Gains (losses)	$ 158	$ (214)	$ 128
Interest Rate Swaps [Member] | Designated as Fair Value Hedge [Member] | Interest Income [Member]
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Derivative Gains (losses)	176	(13)	728
Interest Rate Swaps [Member] | Designated as Fair Value Hedge [Member] | Interest expense [Member]
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Derivative Gains (losses)	1,400	9,380	(3,774)
Interest Rate Caps and Swaps [Member] | Designated as Fair Value Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Income [Member]
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Derivative Gains (losses)	(176)	13	(728)
Interest Rate Caps and Swaps [Member] | Designated as Fair Value Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest expense [Member]
Gain Loss On Fair Value Hedges Recognized In Earnings [Line Items]
Derivative Gains (losses)	$ (1,473)	$ (9,449)	$ 3,805