Long-lived Assets by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 128,409		$ 147,613
United States
Segment Reporting Information [Line Items]
Property and equipment, net	91,293	[1]	103,112	[1]
International
Segment Reporting Information [Line Items]
Property and equipment, net	$ 37,116	[1]	$ 44,501	[1]

[1] Total long-lived assets include property and equipment, net.