Income Taxes - Summary of 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]
Balance at January 1	$ 3,953	$ 4,145	$ 4,553
Additions based on tax positions related to the current year	34	2	4
Reductions due to statute of limitations expiring	(140)	(194)	(412)
Balance at December 31	$ 3,847	$ 3,953	$ 4,145