Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Consolidated Statements of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Derivatives in Cash Flow Hedging Relationships:
Gain related to effective portion of derivatives recognized in accumulated other comprehensive income (loss)	$ 1,846	$ 386
(Loss) gain related to effective portion of derivatives reclassified from accumulated other comprehensive income (loss) to interest expense	(2,626)	1,511
Gain (loss) related to ineffective portion of derivatives recognized in other (income) expense	$ 0	$ 0