Revenue by Significant Geographical Location, Determined by the End Customer (Detail) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 389,951	$ 331,133	$ 763,416	$ 618,431
UNITED STATES
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	195,561	168,923	390,986	334,432
Europe
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	99,222	84,387	191,662	148,968
Other International
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	$ 95,168	$ 77,823	$ 180,768	$ 135,031