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Net Income Per Share - Reconciliation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income $ 45,487 $ 32,549 $ 9,210 $ 17,563 $ 25,522 $ 29,769 $ 33,220 $ 33,786 $ 104,809 $ 122,297 $ 115,778
Denominator:                      
Shares used in net income per common share - basic                 53,472,000 53,282,000 53,232,000
Effect of dilutive securities                 579,000 278,000 283,000
Shares used in net income per common share - diluted                 54,051,000 53,560,000 53,515,000
Net income per common share:                      
Basic $ 0.85 $ 0.61 $ 0.17 $ 0.33 $ 0.48 $ 0.56 $ 0.62 $ 0.63 $ 1.96 $ 2.30 $ 2.17
Diluted $ 0.83 $ 0.60 $ 0.17 $ 0.33 $ 0.48 $ 0.56 $ 0.62 $ 0.63 $ 1.94 $ 2.28 $ 2.16