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Schedule of Amortizable Intangible Asset (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Intangible Assets [Line Items]    
Cost $ 103,222 $ 103,249
Accumulated Amortization (72,791) (69,831)
Net Book Value 30,431 33,418
Customer related intangibles    
Intangible Assets [Line Items]    
Cost 49,519 49,546
Accumulated Amortization (31,990) (30,465)
Net Book Value 17,529 19,081
Technology    
Intangible Assets [Line Items]    
Cost 48,342 48,342
Accumulated Amortization (35,628) (34,282)
Net Book Value $ 12,714 $ 14,060
Other intangibles    
Intangible Assets [Line Items]    
Range of Useful Lives 3 years 3 years
Cost $ 5,361 $ 5,361
Accumulated Amortization (5,173) (5,084)
Net Book Value $ 188 $ 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 9 years 9 years
Maximum | Technology    
Intangible Assets [Line Items]    
Range of Useful Lives 9 years 9 years