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Schedule of Amortizable Intangible Asset (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Other Intangible Assets [Line Items]    
Cost $ 127,461 $ 127,394
Accumulated Amortization (92,706) (83,203)
Net Book Value 34,755 44,191
Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Cost 63,158 63,091
Accumulated Amortization (43,205) (37,573)
Net Book Value 19,953 25,518
Technology    
Goodwill and Other Intangible Assets [Line Items]    
Cost 58,942 58,942
Accumulated Amortization (44,140) (40,269)
Net Book Value 14,802 18,673
Other intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Cost 5,361 5,361
Accumulated Amortization $ (5,361) $ (5,361)
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 7 years 3 years
Maximum | Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 10 years 10 years
Maximum | Technology    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 10 years 10 years