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Schedule of Amortizable Intangible Asset (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Other Intangible Assets [Line Items]    
Cost $ 127,394 $ 103,249
Accumulated Amortization (83,203) (69,831)
Net book value 44,191 33,418
Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Cost 63,091 49,546
Accumulated Amortization (37,573) (30,465)
Net book value 25,518 19,081
Technology    
Goodwill and Other Intangible Assets [Line Items]    
Cost 58,942 48,342
Accumulated Amortization (40,269) (34,282)
Net book value $ 18,673 $ 14,060
Other intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 3 years 3 years
Cost $ 5,361 $ 5,361
Accumulated Amortization $ (5,361) (5,084)
Net book value   $ 277
Minimum | Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 4 years 4 years
Minimum | Technology    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 3 years 3 years
Maximum | Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 10 years 9 years
Maximum | Technology    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 10 years 9 years