Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other 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	Sep. 30, 2014 Gains and Losses on Cash Flow Hedges [Member]	Sep. 30, 2014 Defined Benefit Pension Plan [Member]	Dec. 31, 2013 Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2013			$ (8,582)		$ (8,859)	$ 277	$ 277
Other comprehensive income (loss) before reclassifications			(2,052)		(2,052)
Amounts reclassified out of accumulated other comprehensive income (loss)			5,290		5,290
Other comprehensive income (loss)	2,503	217	3,238	8,294	3,238
Balance at September 30, 2014	$ (5,344)		$ (5,344)		$ (5,621)	$ 277	$ 277