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Earnings Per Common Share Basic and Diluted (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator — basic and diluted                      
Net income $ 7,101 $ 21,691 $ 26,547 $ 30,181 $ 10,349 $ 10,309 $ 21,709 $ 23,686 $ 85,520 $ 66,053 $ 58,807
Denominator                      
Weighted average number of common shares outstanding — basic 41,201 41,239 40,820 40,506 41,078 41,094 40,792 40,384 40,943 40,846 39,726
Effect of dilutive stock options                 281 388 375
Effect of dilutive restricted shares                 485 495 628
Weighted average number of common shares outstanding — diluted 42,018 42,065 41,599 41,148 41,879 41,982 41,696 41,324 41,709 41,729 40,729
Earnings per common share — basic $ 0.17 $ 0.53 $ 0.65 $ 0.75 $ 0.25 $ 0.25 $ 0.53 $ 0.59 $ 2.09 $ 1.62 $ 1.48
Earnings per common share — diluted $ 0.17 $ 0.52 $ 0.64 $ 0.73 $ 0.25 $ 0.25 $ 0.52 $ 0.57 $ 2.05 $ 1.58 $ 1.44
Stock Options And Restricted Shares                      
Denominator                      
Anti-dilutive securities excluded from computation of earnings per share                 1,404 1,734 2,967