Components of Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 0	$ 0	$ 0
State	(4)	(2)	(3)
Foreign	913	(2,698)	(1,311)
Current Income Tax Expense (Benefit), Total	909	(2,700)	(1,314)
Deferred:
Federal	497	1,452	0
State	64	211	0
Foreign	524	423	605
Deferred Income Tax Expense (Benefit), Total	1,085	2,086	605
Total:
Federal	497	1,452	0
State	60	209	(3)
Foreign	1,437	(2,275)	(706)
Income Tax Expense (Benefit), Continuing Operations, Total	$ 1,994	$ (614)	$ (709)