Property and Equipment, Net of Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization		$ 287,098	$ 290,585
United States
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization		237,300	237,900
Europe
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	[1]	43,100	45,500
Other
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	[1]	$ 6,700	$ 7,200

[1] Property and equipment are impacted by movements in foreign currency exchange rates.