Property and Equipment, Net of Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization		$ 286,843	$ 289,898
United States
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization		241,971	241,814
Europe
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	[1]	39,153	41,953
Other
Segment Reporting Information [Line Items]
Property and equipment, net of accumulated depreciation and amortization	[1]	$ 5,719	$ 6,131

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