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Net Income Per Share - Schedule of Net Income (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Subsidiary Sale Of Stock [Line Items]                
Net income - basic and diluted $ 53,789 $ 51,338 $ (102,115) $ 50,764 $ (5,913) $ (41,818) $ 3,012 $ 3,033
Weighted-average common shares outstanding:                
Weighted average common shares outstanding, basic 91,859     90,555     91,440 90,064
Effect of dilutive securities:                
2024 Notes 1,277     2,255     805 1,326
Diluted 96,074     96,798     95,231 95,272
Net income per share:                
Basic $ 0.59     $ 0.56     $ 0.03 $ 0.03
Diluted $ 0.56     $ 0.52     $ 0.03 $ 0.03
Stocks Options                
Effect of dilutive securities:                
Effect of dilutive securities 2,466     3,352     2,572 3,322
Restricted Stock                
Effect of dilutive securities:                
Effect of dilutive securities 461     629     392 558
Employee Stock                
Effect of dilutive securities:                
Effect of dilutive securities 11     7     22 2