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Schedule of Amortizable Intangible Asset (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Goodwill and Other Intangible Assets [Line Items]    
Cost $ 127,403 $ 127,394
Accumulated Amortization (86,405) (83,203)
Net Book Value 40,998 44,191
Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Cost 63,100 63,091
Accumulated Amortization (39,441) (37,573)
Net Book Value 23,659 25,518
Technology    
Goodwill and Other Intangible Assets [Line Items]    
Cost 58,942 58,942
Accumulated Amortization (41,603) (40,269)
Net Book Value $ 17,339 $ 18,673
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) $ (5,361)
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 3 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