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Segment Information - Pre-Tax Depreciation and Amortization by Operating Segment (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Segment Reporting Information [Line Items]        
Depreciation and amortization of property and equipment $ 6,701 $ 6,822 $ 19,430 $ 20,785
Amortization of intangible assets 4,210 2,813 12,643 9,312
Depreciation and amortization, total 10,911 9,635 32,073 30,097
North America Segment [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization of property and equipment 5,276 5,411 15,380 16,691
Amortization of intangible assets 4,012 2,112 12,036 7,007
EMEA Segment [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization of property and equipment 1,287 1,300 3,662 3,753
Amortization of intangible assets   527 12 1,926
APAC Segment [Member]        
Segment Reporting Information [Line Items]        
Depreciation and amortization of property and equipment 138 111 388 341
Amortization of intangible assets $ 198 $ 174 $ 595 $ 379