Revenue by Geographic Region (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
Segment Reporting Information [Line Items]
Revenue	$ 221,710	[1]	$ 248,580	[1]	$ 681,971	[1]	$ 761,241	[1]
United States
Segment Reporting Information [Line Items]
Revenue	129,182	[1]	138,832	[1]	392,351	[1]	436,036	[1]
Germany
Segment Reporting Information [Line Items]
Revenue	17,698	[1]	25,012	[1]	60,007	[1]	73,867	[1]
Other Foreign
Segment Reporting Information [Line Items]
Revenue	$ 74,830	[1]	$ 84,736	[1]	$ 229,613	[1]	$ 251,338	[1]

[1] Revenue by geographic region is generally based on the location of the Company's subsidiary.