Derivative Financial Instruments - Schedule of Derivatives (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Derivative [Line Items]
Notional Amount	$ 181,186,000		$ 181,186,000		$ 131,377,000
Fair Value Asset	370,000		370,000		102,000
Fair Value Liability	(11,000)		(11,000)		(16,000)
Other income (loss)	46,000	(115,000)	(123,000)	41,000
Pay Fixed Interest Rate Swaps [Member]
Derivative [Line Items]
Notional Amount	690,000		690,000		705,000
Fair Value Liability	(11,000)		(11,000)		(16,000)
Other income (loss)	4,000	(2,000)	5,000	150,000
Interest Rate Caps [Member]
Derivative [Line Items]
Notional Amount	180,496,000		180,496,000		130,672,000
Fair Value Asset	370,000		370,000		102,000
Other income (loss)	$ 42,000	$ (113,000)	$ (128,000)	$ (109,000)