Long-Term Debt - Recorded Expenses with Respect to Long-Term Debt (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Debt Disclosure [Abstract]
Interest expense	$ 7,561		$ 7,647		$ 15,214		$ 15,045
Amortization of debt issuance cost	1,110	[1]	781	[1]	1,849	[1]	1,559	[1]
Commitment fee	126	[1]	150	[1]	251	[1]	276	[1]
Total	$ 8,797		$ 8,578		$ 17,314		$ 16,880

[1] Included in Other expense.