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Earnings per Share - Schedule Of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income attributable to continuing operations $ 24,883 $ 33,717 $ 33,179 $ 32,371 $ (32,984) $ 32,066 $ 12,532 $ 14,413 $ 124,150 $ 26,027 $ 92,691
Preferred stock dividends                 42 42 42
Income from continuing operations available to common equity                 124,108 25,985 92,649
Dividends and undistributed earnings allocated to participating securities                 (117) (62) (144)
Income from continuing operations available to common shareholders                 123,991 25,923 92,505
Net loss attributable to discontinued operations                 0 0 (755)
Preferred stock dividends                 0 0 0
Loss from discontinued operations available to common equity                 0 0 (755)
Dividends and undistributed earnings allocated to participating securities                 0 0 1
Loss from discontinued operations available to common shareholders                 $ 0 $ 0 $ (754)
Basic weighted-average shares outstanding                 38,362 37,997 37,456
Stock options and other stock compensation                 599 700 530
Diluted weighted-average shares outstanding                 38,961 38,697 37,986
Antidilutive stock options                 0 0 0
Earnings per share attributable to continuing operations:                      
Earnings per share attributable to continuing operations, basic (dollars per share) $ 0.65 $ 0.88 $ 0.86 $ 0.85 $ (0.87) $ 0.84 $ 0.33 $ 0.38 $ 3.23 $ 0.68 $ 2.47
Earnings per share attributable to continuing operations, diluted (dollars per share) $ 0.64 $ 0.86 $ 0.85 $ 0.83 $ (0.87) $ 0.83 $ 0.32 $ 0.37 3.18 0.67 2.44
Loss per share attributable to discontinued operations:                      
Earnings per share attributable to discontinued operations, basic (dollars per share)                 0.00 0.00 (0.02)
Earnings per share attributable to discontinued operations, diluted (dollars per share)                 $ 0.00 $ 0.00 $ (0.02)