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Schedule of Amortizable Intangible Asset (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Intangible Assets [Line Items]    
Cost $ 127,437 $ 103,249
Accumulated Amortization (79,975) (69,831)
Net Book Value 47,462 33,418
Customer related intangibles    
Intangible Assets [Line Items]    
Cost 63,134 49,546
Accumulated Amortization (35,714) (30,465)
Net Book Value 27,420 19,081
Technology    
Intangible Assets [Line Items]    
Cost 58,942 48,342
Accumulated Amortization (38,908) (34,282)
Net Book Value $ 20,034 $ 14,060
Other intangibles    
Intangible Assets [Line Items]    
Range of Useful Lives 3 years 3 years
Cost $ 5,361 $ 5,361
Accumulated Amortization (5,353) (5,084)
Net Book Value $ 8 $ 277
Minimum | Customer related intangibles    
Intangible Assets [Line Items]    
Range of Useful Lives 4 years 4 years
Minimum | Technology    
Intangible Assets [Line Items]    
Range of Useful Lives 3 years 3 years
Maximum | Customer related intangibles    
Intangible Assets [Line Items]    
Range of Useful Lives 10 years 9 years
Maximum | Technology    
Intangible Assets [Line Items]    
Range of Useful Lives 10 years 9 years