Segment Information - Selected Segment Financial Data, Revenues and Income (Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Revenues	$ 219,930	$ 265,822	$ 445,996	$ 498,639
Income (loss) before income taxes	(33,916)	32,876	92,417	32,184
Operating Segments [Member] | Americas Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	(3,199)	21,569	146,798	37,678
Operating Segments [Member] | Americas Segment [Member] | United States [Member]
Segment Reporting Information [Line Items]
Revenues	125,550	160,754	258,915	306,538
Operating Segments [Member] | Americas Segment [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues	23,710	16,977	46,562	34,943
Operating Segments [Member] | EMEA Segment [Member]
Segment Reporting Information [Line Items]
Revenues	47,575	68,504	97,212	117,888
Income (loss) before income taxes	29,505	33,494	58,932	54,195
Operating Segments [Member] | Asia/Pacific Segment [Member]
Segment Reporting Information [Line Items]
Revenues	23,095	19,587	43,307	39,270
Income (loss) before income taxes	11,953	8,315	22,519	18,572
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes	$ (72,175)	$ (30,502)	$ (135,832)	$ (78,261)