Condensed Consolidated Financial Statements - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Gross Balance prior to the end of year		$ 957,123
Total impairment, beginning of period		(47,432)
Beginning Balance	$ 909,691
Foreign currency translation adjustments	3,323
Ending Balance	913,014
Americas Segment [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year		524,829
Total impairment, beginning of period		(47,432)
Beginning Balance	477,397
Foreign currency translation adjustments	293
Ending Balance	477,690
EMEA Segment [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year		374,130
Beginning Balance	374,130
Foreign currency translation adjustments	574
Ending Balance	374,704
Asia/Pacific Segment [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year		$ 58,164
Beginning Balance	58,164
Foreign currency translation adjustments	2,456
Ending Balance	$ 60,620