Segment Information - Selected Segment Financial Data, Revenues and Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Revenues	$ 226,066	$ 232,817
Income (loss) before income taxes	126,333	(692)
Operating Segments [Member] | Americas Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	149,997	16,109
Operating Segments [Member] | Americas Segment [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues	133,365	145,784
Operating Segments [Member] | Americas Segment [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues	22,852	17,966
Operating Segments [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Revenues	49,637	49,384
Income (loss) before income taxes	29,427	20,701
Operating Segments [Member] | Asia/Pacific Segment [Member]
Segment Reporting Information [Line Items]
Revenues	20,212	19,683
Income (loss) before income taxes	10,566	10,257
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (63,657)	$ (47,759)