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Schedule of Amortizable Intangible Asset (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill and Other Intangible Assets [Line Items]    
Cost $ 103,249 $ 103,293
Accumulated Amortization (69,831) (57,629)
Net Book Value 33,418 45,664
Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Cost 49,546 49,590
Accumulated Amortization (30,465) (24,338)
Net Book Value 19,081 25,252
Technology    
Goodwill and Other Intangible Assets [Line Items]    
Cost 48,342 48,342
Accumulated Amortization (34,282) (28,890)
Net Book Value $ 14,060 19,452
Other intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 3 years  
Cost $ 5,361 5,361
Accumulated Amortization (5,084) (4,401)
Net Book Value $ 277 $ 960
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
Minimum | Other intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives   1 year
Maximum | Customer related intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 9 years 9 years
Maximum | Technology    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives 9 years 9 years
Maximum | Other intangibles    
Goodwill and Other Intangible Assets [Line Items]    
Range of Useful Lives   3 years