Property and Equipment, Net of Accumulated Depreciation and Amortization (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 285,413		$ 290,585
United States
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	236,100		237,900
Europe
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	42,900	[1]	45,500	[1]
Other
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	$ 6,400	[1]	$ 7,200	[1]

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