Derivative Instruments and Hedging Activities - Schedule of Pre-tax Effect of Derivative Financial Instruments on Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivatives in Cash Flow Hedging Relationships:
Gain (loss) related to effective portion of derivatives recognized in accumulated other comprehensive income	$ 1,005	$ (1,380)	$ (1,868)	$ 3,338
Gain (loss) related to effective portion of derivatives reclassified from accumulated other comprehensive income to interest expense	$ 746	$ (422)	$ 1,879	$ (1,144)