Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, beginning balance	$ 7,064	$ 9,875	$ 9,121
Additions based on tax positions related to the current year	4,853	432	830
Additions for tax positions of prior years	545	96	370
Reductions for tax positions of prior years	(538)	(24)	(39)
Settlement of tax audits	0	(768)	0
Reductions due to lapsed statute of limitations	(73)	(2,547)	(407)
Unrecognized tax benefits, ending balance	$ 11,851	$ 7,064	$ 9,875