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Stock Based Compensation (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation $ 6,600 $ 30,451 $ 40,307 $ 36,612
Income tax benefit   (8,528) (11,537) (9,762)
Total stock-based compensation expense after income taxes   21,923 28,770 26,850
Cost Of Revenues        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation   3,065 3,675 4,338
Engineering And Development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation   9,362 10,146 12,452
Selling and Administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock-based compensation   $ 18,024 $ 26,486 $ 19,822