Condensed Consolidated Financial Statements - Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Goodwill [Line Items]
Gross Balance prior to the end of year			$ 828,595
Total impairment, beginning of period			(47,432)
Beginning Balance	781,163
Goodwill from acquisitions	(820)	[1]
Foreign currency translation adjustments	(6,927)
Ending Balance	773,416
Americas [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year			523,914
Total impairment, beginning of period			(47,432)
Beginning Balance	476,482
Goodwill from acquisitions	(788)	[1]
Foreign currency translation adjustments	(695)
Ending Balance	474,999
EMEA [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year			240,303
Beginning Balance	240,303
Goodwill from acquisitions	(32)	[1]
Foreign currency translation adjustments	(3,436)
Ending Balance	236,835
Asia/Pacific [Member]
Goodwill [Line Items]
Gross Balance prior to the end of year			64,378
Beginning Balance	64,378
Foreign currency translation adjustments	(2,796)
Ending Balance	$ 61,582

[1] Goodwill from acquisitions relates to adjustments in the goodwill recorded for the acquisition of Retail Decisions Europe Limited and Retail Decisions, Inc. (collectively "ReD") as discussed in Note 2. The purchase price allocation for ReD is preliminary as of March 31, 2015 and accordingly is subject to future changes during the maximum one-year allocation period.