Derivative Instruments and Hedging Activities - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income (loss):
Balance at December 31, 2013		$ 11
Balance at December 31, 2014	(483)	11
Gains (Losses) on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss):
Balance at December 31, 2013	11
Other comprehensive income before reclassifications	1,169
Amounts reclassified from accumulated other comprehensive income (loss) to interest expense	(1,663)
Unrealized loss on derivatives, net of tax	(494)
Balance at December 31, 2014	$ (483)