Segments and Geographical Information - Long-Lived Assets by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Long-lived assets	$ 82,645	$ 56,707	$ 34,137
United States
Segment Reporting Information [Line Items]
Long-lived assets	62,543	45,720	31,381
Mexico
Segment Reporting Information [Line Items]
Long-lived assets	6,473	4,673	262
the Netherlands
Segment Reporting Information [Line Items]
Long-lived assets	5,335	1,726	837
Other international
Segment Reporting Information [Line Items]
Long-lived assets	$ 8,294	$ 4,588	$ 1,657