Income Taxes - Components of (Benefit) 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	$ 107	$ 4	$ 4
State	24	222	158
Foreign	2,083	(388)	(271)
Total current (benefit) provision	2,214	(162)	(109)
Deferred:
Federal	137	163	162
State	29	8	(30)
Foreign	(3,539)	(4,516)	(2,077)
Total deferred benefit	(3,420)	(4,345)	(1,945)
Total benefit	$ (1,159)	$ (4,507)	$ (2,054)