Derivative Instruments and Hedging Activities - Derivatives Designated as Hedging Instruments (Detail) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 18,921		$ 18,921		$ 19,269
Derivative Assets, Fair Value	0		0		0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,203		1,203		438
Net loss	(80)	$ (95)	(161)	$ (191)
Amounts included in accumulated other comprehensive income (loss)	(782)	(285)
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	18,921		18,921		19,269
Derivative Assets, Fair Value	0		0		0
Amounts included in accumulated other comprehensive income (loss)	(782)	(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	80	$ 95	161	$ 191
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	$ 1,203		$ 1,203		$ 438