Derivative Financial Instruments - Additional Information (Detail) (USD $)			9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Interest Rate Caps [Member]	Mar. 14, 2014 Interest Rate Caps [Member]
Derivative [Line Items]
Interest rate cap agreement, notional amount	$ 181,186,000	$ 131,377,000		$ 50,000,000
Interest rate cap agreement, strike price				1.25%
Interest rate cap agreement, premium				$ 400,000
Interest rate cap agreement, expiration date			Mar. 01, 2017