Long-lived Assets by Geographic Region (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Segment Reporting Information [Line Items]
Property and equipment, net	$ 119,729		$ 124,169		$ 147,613
United States
Segment Reporting Information [Line Items]
Property and equipment, net	89,343	[1]	88,284	[1]	103,112	[1]
International
Segment Reporting Information [Line Items]
Property and equipment, net	$ 30,386	[1]	$ 35,885	[1]	$ 44,501	[1]

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