XML 46 R35.htm IDEA: XBRL DOCUMENT v3.10.0.1
Earnings Per Common Share - Schedule of Earnings Per Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Earnings Per Common Share [Line Items]        
Conversion price (in dollars per share) $ 101.38   $ 101.38  
Numerator — basic and diluted        
Net income $ 44,333 $ 32,214 $ 126,887 $ 41,074
Denominator        
Weighted average number of common shares outstanding — basic (in shares) 37,318 37,431 37,008 39,301
Effect of dilutive stock options (in shares) 639 31 500 96
Effect of dilutive restricted shares (in shares) 799 284 706 318
Weighted average number of common shares outstanding — diluted (in shares) 38,756 37,746 38,214 39,715
Earnings per common share — basic (in dollars per share) $ 1.19 $ 0.86 $ 3.43 $ 1.05
Earnings per common share — diluted (in dollars per share) $ 1.14 $ 0.85 $ 3.32 $ 1.03
Stock Options And Restricted Shares        
Denominator        
Antidilutive stock options and restricted shares (in shares) 4 2,328 221 1,755