Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
Interest expense	$ 14,703	$ 11,121	$ 13,546
Amortization of discounts	5,784	0	0
Amortization of debt issuance costs	3,667	5,066	5,264
Write off of unamortized deferred debt issuance costs	3,901	0	1,940
Total interest expense	$ 28,055	$ 16,187	$ 20,750