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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 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income $ 42,764 $ 47,428 $ 37,739 $ 12,455 $ 71,636 $ 93,277 $ 122,862 $ 105,121 $ 140,386 $ 392,896 $ 339,132
Denominator:                      
Shares used in net income per common share – basic                 54,711,000 54,406,000 54,137,000
Effect of dilutive securities                 400,000 586,000 937,000
Shares used in net income per common share – diluted                 55,111,000 54,992,000 55,074,000
Net income per common share:                      
Basic $ 0.78 $ 0.86 $ 0.69 $ 0.23 $ 1.33 $ 1.71 $ 2.25 $ 1.93 $ 2.57 $ 7.22 $ 6.26
Diluted $ 0.77 $ 0.86 $ 0.69 $ 0.23 $ 1.32 $ 1.70 $ 2.22 $ 1.90 $ 2.55 $ 7.14 $ 6.16