Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, interest rate cap floor	1.50%		1.50%
Unrealized loss on interest rate caps, net of tax	$ 193,000	$ (557,000)	$ (469,000)	$ (1,497,000)
Interest Rate Cap [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount	209,000,000		209,000,000
Interest rate caps	$ 134,000		134,000		$ 1,147,000
Unrealized loss on interest rate caps, net of tax			(469,000)
Unrealized loss on interest rate caps, tax			$ (83,000)