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Condensed Consolidated Financial Statements - Changes in Carrying Amount of Goodwill (Detail) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 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 [1] (1,017)  
Foreign currency translation adjustments (4,867)  
Ending Balance 775,279  
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 [1] (788)  
Foreign currency translation adjustments (647)  
Ending Balance 475,047  
EMEA [Member]    
Goodwill [Line Items]    
Gross Balance prior to the end of year   240,303
Beginning Balance 240,303  
Goodwill from acquisitions [1] (229)  
Foreign currency translation adjustments (2,068)  
Ending Balance 238,006  
Asia/Pacific [Member]    
Goodwill [Line Items]    
Gross Balance prior to the end of year   $ 64,378
Beginning Balance 64,378  
Foreign currency translation adjustments (2,152)  
Ending Balance $ 62,226  
[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 June 30, 2015 and accordingly is subject to future changes during the maximum one-year allocation period.