Segments and Geographic Information - Company's Reportable Segments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 1,286,340	$ 1,327,523	$ 1,263,460
Percentage of revenues	100.00%	100.00%	100.00%
Depreciation, net	$ 43,752	$ 45,363	$ 42,084
Amortization of intangibles	14,170	14,396	14,863
Income (loss) from operations	94,264	79,555	53,527
Other (expense), net	(4,281)	(2,396)	(2,202)
Income taxes	(21,386)	(19,368)	(14,065)
Net income	68,597	57,791	37,260
Total assets	947,772	944,500	950,261
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenues	$ 1,045,415	$ 1,070,824	$ 1,050,813
Percentage of revenues	81.30%	80.70%	83.20%
Depreciation, net	$ 37,842	$ 40,557	$ 37,818
Amortization of intangibles	13,648	14,396	14,863
Income (loss) from operations	135,443	113,549	94,006
Total assets	1,058,467	1,080,010	1,097,788
Operating Segments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Revenues	$ 240,826	$ 256,699	$ 212,647
Percentage of revenues	18.70%	19.30%	16.80%
Depreciation, net	$ 4,559	$ 4,806	$ 4,266
Amortization of intangibles	522
Income (loss) from operations	15,336	16,208	6,052
Total assets	1,419,578	$ 1,373,590	$ 1,409,185
Other Items [Member]
Segment Reporting Information [Line Items]
Revenues	$ 99
Percentage of revenues	0.00%	0.00%	0.00%
Depreciation, net	$ 1,351
Income (loss) from operations	(56,515)	$ (50,202)	$ (46,531)
Other (expense), net	(4,281)	(2,396)	(2,202)
Income taxes	(21,386)	(19,368)	(14,065)
Total assets	$ (1,530,273)	$ (1,509,100)	$ (1,556,712)