Long-lived Assets by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Property and equipment, net	$ 121,461		$ 124,169
United States
Segment Reporting Information [Line Items]
Property and equipment, net	89,925	[1]	88,284	[1]
International
Segment Reporting Information [Line Items]
Property and equipment, net	$ 31,536	[1]	$ 35,885	[1]

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