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Earnings per Common Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Earnings per common share—basic    
Net income $ 38,390 $ 35,819
Weighted-average common shares outstanding—basic (in shares) 93,952 77,753
Basic earnings per common share (in dollars per share) $ 0.41 $ 0.46
Earnings per common share—diluted    
Net income $ 38,390 $ 35,819
Add: Interest on convertible debt 0 1,246
Net income including assumed conversions $ 38,390 $ 37,065
Weighted-average common shares outstanding—basic (in shares) 93,952 77,753
Convertible notes weighted-average shares outstanding (in shares) 0 15,000
Options, restricted stock and other dilutive securities (in shares) 1,472 1,143
Weighted-average common shares outstanding—diluted (in shares) 95,424 93,896
Dilutive earnings per common share (in dollars per share) $ 0.40 $ 0.39