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Net Income Per Share - Reconciliation between Basic and Diluted Weighted Average Shares Outstanding (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net income $ 113,896 $ 90,828
Net income attributable to unvested awarded performance stock (3,201) (1,902)
Net income attributable to common shares $ 110,695 $ 88,926
Weighted average number of common shares outstanding - basic (in shares) 280,564 275,952
Less unvested awarded performance stock included in weighted average number of common shares outstanding - basic (in shares) (7,885) (5,780)
Weighted average number of common shares outstanding for basic earnings per common share (in shares) 272,679 270,172
Dilutive effect of stock options (in shares) 2,335 5,542
Weighted average number of shares outstanding - diluted (in shares) 275,014 275,714
Basic (in dollars per share) $ 0.41 $ 0.33
Diluted (in dollars per share) $ 0.40 $ 0.32