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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:        
Net income $ 93,277 $ 75,994 $ 321,260 $ 261,494
Denominator:        
Shares used in net income per common share – basic 54,476,000 54,282,000 54,539,000 54,076,000
Effect of dilutive securities:        
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 478,000 819,000 632,000 944,000
Shares used in net income per common share – diluted 54,954,000 55,101,000 55,171,000 55,020,000
Net income per common share:        
Basic $ 1.71 $ 1.40 $ 5.89 $ 4.84
Diluted $ 1.70 $ 1.38 $ 5.82 $ 4.75