Segment and Geographic Information - Pre-Tax Depreciation and Amortization for Operating Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 40,570	$ 41,544	$ 41,177
North America Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	31,365	31,815	32,457
EMEA Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	8,325	8,608	7,803
APAC Segment [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 880	$ 1,121	$ 917