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Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic Net Income Per Share    
Net income $ 86,818 $ 22,640
Weighted average common shares outstanding (in shares) 164,997 167,748
Effect of dilutive securities:    
Restricted stock (in shares) 687 616
Stock options (in shares) 23 40
Basic Net Income Per Share (in dollars per share) $ 0.53 $ 0.13
Earnings Per Share, Diluted [Abstract]    
Net income $ 86,818 $ 22,640
Weighted average common shares outstanding (in shares) 164,997 167,748
Weighted average shares outstanding (in shares) 165,707 168,404
Diluted Net Income Per Share (in dollars per share) $ 0.52 $ 0.13