Current and Deferred Income Tax Provision (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 12	$ 194	$ 153
State	140	351	356
Foreign
Current Income Tax Expense (Benefit), Total	152	545	509
Deferred:
Federal	(6,002)
State		1	4
Foreign	238	406	(156)
Deferred Income Tax Expense (Benefit), Total	(5,764)	407	(152)
Net income tax provision	$ (5,612)	$ 952	$ 357