Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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	$ (79,000)	$ (161,000)	$ (662,000)	$ (940,000)
Interest Rate Cap [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Derivative, notional amount	219,000,000		219,000,000
Interest rate caps	$ 134,000		134,000		$ 1,147,000
Unrealized loss on interest rate caps, net of tax			(662,000)
Unrealized loss on interest rate caps, tax			$ (128,000)