Segment Information - Selected Segment Financial Data, Revenues and Income (Loss) Before Income Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenues	$ 232,817	$ 221,473
Loss before taxes	(692)	(9,742)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Loss before taxes	(47,759)	(49,112)
Americas - United States [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	145,784	136,130
Americas - Other [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	17,966	18,639
EMEA [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	49,384	47,461
Loss before taxes	20,701	17,510
Asia/Pacific [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	19,683	19,243
Loss before taxes	10,257	5,579
Americas [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Loss before taxes	$ 16,109	$ 16,281