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Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Common Share [Line Items]                      
Conversion price (in dollars per share) $ 101.38               $ 101.38    
Numerator — basic and diluted                      
Net income $ 29,061 $ 60,422 $ 64,598 $ 62,645 $ 23,724 $ 44,333 $ 43,609 $ 38,945 $ 216,726 $ 150,611 $ 107,962
Denominator                      
Weighted average number of common shares outstanding — basic (in shares) 36,545 36,617 36,960 36,981 37,368 37,318 37,001 36,700 36,774 37,098 38,697
Effect of dilutive convertible notes (in shares)                 62 0 0
Effect of dilutive stock options (in shares)                 455 491 117
Effect of dilutive restricted shares (in shares)                 820 729 378
Weighted average number of common shares outstanding — diluted (in shares) 38,126 37,938 38,168 38,219 38,628 38,756 38,271 37,612 38,111 38,318 39,192
Earnings per common share — basic (in dollars per share) $ 0.80 $ 1.65 $ 1.75 $ 1.69 $ 0.63 $ 1.19 $ 1.18 $ 1.06 $ 5.89 $ 4.06 $ 2.79
Earnings per common share — diluted (in dollars per share) $ 0.76 $ 1.59 $ 1.69 $ 1.64 $ 0.61 $ 1.14 $ 1.14 $ 1.04 $ 5.69 $ 3.93 $ 2.75
Stock Options And Restricted Shares                      
Denominator                      
Antidilutive stock options and restricted shares (in shares)                 19 175 1,561