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Segment Information - Pre-Tax Depreciation and Amortization by Reportable Operating Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Depreciation and amortization $ 9,635 $ 9,425 $ 30,097 $ 28,426
North America Segment [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization 7,523 7,555 23,698 22,743
EMEA Segment [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization 1,827 1,651 5,679 5,018
APAC Segment [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization $ 285 $ 219 $ 720 $ 665