Schedule of Revenues by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 50,104	$ 57,666	$ 106,924	$ 164,867
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	41,153	31,357	66,403	89,282
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	7,606	24,619	33,594	67,766
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,345	$ 1,690	$ 6,927	$ 7,819