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Schedule of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 543,004 $ 523,052
Accumulated Amortization 303,173 332,452
Net Carrying Amount $ 239,831 $ 190,600
Weighted Average Useful Life, years 6 years 8 months 12 days 6 years 9 months 18 days
Developed technology    
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 379,778 $ 345,513
Accumulated Amortization 220,306 224,059
Net Carrying Amount $ 159,472 $ 121,454
Weighted Average Useful Life, years 6 years 6 years 2 months 12 days
Customer Relationships    
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 110,340 $ 146,635
Accumulated Amortization 63,718 93,998
Net Carrying Amount $ 46,622 $ 52,637
Weighted Average Useful Life, years 7 years 10 months 24 days 7 years 8 months 12 days
Trademarks and tradenames    
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 52,396 $ 30,414
Accumulated Amortization 18,879 14,205
Net Carrying Amount $ 33,517 $ 16,209
Weighted Average Useful Life, years 9 years 6 months 9 years
Non-compete agreements    
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 320 $ 320
Accumulated Amortization 100 20
Net Carrying Amount $ 220 $ 300
Weighted Average Useful Life, years 4 years 4 years
Customer backlog    
Finite-Lived Intangible Assets    
Gross Carrying Amount $ 170 $ 170
Accumulated Amortization $ 170 $ 170
Weighted Average Useful Life, years 3 months 18 days 3 months 18 days