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Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Gross Balance prior to the end of year   $ 548,573
Total impairment, beginning of period   (47,432)
Beginning Balance 501,141  
Goodwill from acquisitions 133,166 [1]  
Foreign currency translation adjustments (3,568)  
Ending Balance 630,739  
Americas
    
Goodwill [Line Items]    
Gross Balance prior to the end of year   316,222
Total impairment, beginning of period   (47,432)
Beginning Balance 268,790  
Goodwill from acquisitions 133,998 [1]  
Foreign currency translation adjustments (483)  
Ending Balance 402,305  
EMEA
    
Goodwill [Line Items]    
Gross Balance prior to the end of year   158,653
Beginning Balance 158,653  
Foreign currency translation adjustments 638  
Ending Balance 159,291  
Asia /Pacific
    
Goodwill [Line Items]    
Gross Balance prior to the end of year   73,698
Beginning Balance 73,698  
Goodwill from acquisitions (832) [1]  
Foreign currency translation adjustments (3,723)  
Ending Balance $ 69,143  
[1] Addition relates to the goodwill acquired in the acquisition of ORCC and PTESA as discussed in Note 2 as well as adjustments to Distra. The purchase price allocations for ORCC and PTESA are preliminary as of September 30, 2013 and accordingly are subject to future changes during the maximum one-year allocation period. The purchase price allocation for Distra was finalized during the nine months ended September 30, 2013.