Income Taxes - Provision for Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 3,994	$ 3,184	$ 7,940
State	433	755	1,820
International	1,193	1,222	755
Deferred:
Federal	(2,053)	(3,618)	2,267
State	(1,362)	(392)	(1,768)
International	(353)	1,703	(1,240)
Total provision for income taxes	$ 1,852	$ 2,854	$ 9,774