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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:                
Net income $ 47,428 $ 37,739 $ 12,455 $ 93,277 $ 122,862 $ 105,121 $ 97,622 $ 321,260
Denominator:                
Shares used in net income per common share - basic 54,945,000     54,476,000     54,636,000 54,539,000
Effect of dilutive securities:                
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 259,000     478,000     409,000 632,000
Shares used in net income per common share - diluted 55,204,000     54,954,000     55,045,000 55,171,000
Net income per common share:                
Basic $ 0.86     $ 1.71     $ 1.79 $ 5.89
Diluted $ 0.86     $ 1.70     $ 1.77 $ 5.82