Segments and Geographical Information - Net Revenues by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Segment Reporting Information [Line Items]
Net revenues	$ 560,041	[1]	$ 479,741	[1]	$ 387,126	[1]
United States
Segment Reporting Information [Line Items]
Net revenues	427,929	[1]	359,936	[1]	290,847	[1]
the Netherlands
Segment Reporting Information [Line Items]
Net revenues	121,826	[1]	109,831	[1]	92,032	[1]
Other international
Segment Reporting Information [Line Items]
Net revenues	$ 10,286	[1]	$ 9,974	[1]	$ 4,247	[1]

[1] Revenues are attributed to countries based on location of where revenue is recognized.