Segments and Geographic Information - Company's Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Revenues	$ 1,263,460	$ 1,127,698	$ 1,169,267
Percentage of revenues	100.00%	100.00%	100.00%
Depreciation, net	42,084	40,369	46,111
Amortization of intangibles	14,863	10,479	7,961
Income (loss) from continuing operations	53,527	47,779	65,535
Other (expense), net	(2,202)	(2,622)	(1,879)
Income taxes	(14,065)	(5,207)	(11,342)
Income from continuing operations, net of taxes	37,260	39,950	52,314
Income (loss) from discontinued operations, net of taxes		(11,527)	(3,973)
Net income	37,260	28,423	48,341
Total assets	950,261	908,689	769,130
Americas [Member]
Segment Reporting Information [Line Items]
Revenues	1,050,813	947,147	963,142
EMEA [Member]
Segment Reporting Information [Line Items]
Revenues	212,647	180,551	206,125
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Revenues	1,050,813	947,147	963,142
Percentage of revenues	83.20%	84.00%	82.40%
Depreciation, net	37,818	36,494	41,059
Amortization of intangibles	14,863	10,479	7,961
Income (loss) from continuing operations	94,006	93,580	115,727
Income (loss) from discontinued operations, net of taxes		(10,707)	559
Total assets	1,097,788	1,265,119	1,112,252
Operating Segments [Member] | EMEA [Member]
Segment Reporting Information [Line Items]
Revenues	212,647	180,551	206,125
Percentage of revenues	16.80%	16.00%	17.60%
Depreciation, net	4,266	3,875	5,052
Income (loss) from continuing operations	6,052	5,488	(3,746)
Income (loss) from discontinued operations, net of taxes		(820)	(4,532)
Total assets	1,409,185	1,100,938	1,131,719
Other [Member]
Segment Reporting Information [Line Items]
Income (loss) from continuing operations	(46,531)	(51,289)	(46,446)
Other (expense), net	(2,202)	(2,622)	(1,879)
Income taxes	(14,065)	(5,207)	(11,342)
Total assets	$ (1,556,712)	$ (1,457,368)	$ (1,474,841)