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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 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:            
Net income $ 37,739 $ 12,455 $ 122,862 $ 105,121 $ 50,194 $ 227,983
Denominator:            
Shares used in net income per common share - basic 54,815,000   54,719,000   54,481,000 54,571,000
Effect of dilutive securities:            
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan 274,000   555,000   485,000 709,000
Shares used in net income per common share - diluted 55,089,000   55,274,000   54,966,000 55,280,000
Net income per common share:            
Basic $ 0.69   $ 2.25   $ 0.92 $ 4.18
Diluted $ 0.69   $ 2.22   $ 0.91 $ 4.12