Derivative Instruments and Hedging Activities - Derivatives Designated as Hedging Instruments (Detail) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 19,096		$ 19,269
Derivative Assets, Fair Value	0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	983		438
Net loss	(81)	$ (96)
Amounts included in accumulated other comprehensive income (loss)	(639)	(285)
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	19,096		19,269
Derivative Assets, Fair Value	0		0
Amounts included in accumulated other comprehensive income (loss)	(639)	(285)
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap—cash flow hedge—net interest payments	81	$ 96
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Other Liabilities [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 983		$ 438