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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
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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
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income attributable to continuing operations | $ 25,216 | $ 25,486 | $ 29,306 | $ 12,683 | $ 20,840 | $ 15,712 | $ 23,722 | $ 9,316 | $ 92,691 | $ 69,590 | $ 87,447
Preferred stock dividends |  |  |  |  |  |  |  |  | 42 | 41 | 41
Income from continuing operations available to common equity |  |  |  |  |  |  |  |  | 92,649 | 69,549 | 87,406
Dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | (144) | (192) | (546)
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  | 92,505 | 69,357 | 86,860
Net income attributable to discontinued operations | $ (300) | $ (1,300) | $ 1,777 | $ (932) | $ 11 | $ 264 | $ 576 | $ 366 | (755) | 1,217 | 1,059
Preferred stock dividends |  |  |  |  |  |  |  |  | 0 | (1) | (1)
Income from discontinued operations available to common equity |  |  |  |  |  |  |  |  | (755) | 1,216 | 1,058
Dividends and undistributed earnings allocated to participating securities |  |  |  |  |  |  |  |  | 1 | (3) | (7)
Income from discontinued operations available to common shareholders |  |  |  |  |  |  |  |  | $ (754) | $ 1,213 | $ 1,051
Basic weighted-average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 37,456 | 37,293 | 37,138
Stock options and other stock compensation (in shares) |  |  |  |  |  |  |  |  | 530 | 417 | 590
Diluted weighted-average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 37,986 | 37,710 | 37,728
Antidilutive stock options (in shares) |  |  |  |  |  |  |  |  | 0 | 658 | 0
Earnings per share attributable to continuing operations: |  |  |  |  |  |  |  |  |  |  |
Earnings per share attributable to continuing operations, basic (dollars per share) | $ 0.67 | $ 0.68 | $ 0.78 | $ 0.34 | $ 0.56 | $ 0.42 | $ 0.63 | $ 0.25 | $ 2.47 | $ 1.86 | $ 2.34
Earnings per share attributable to continuing operations, diluted (dollars per share) | 0.66 | 0.67 | 0.77 | 0.34 | 0.55 | 0.41 | 0.62 | 0.25 | 2.44 | 1.84 | 2.30
Earnings per share attributable to discontinued operations: |  |  |  |  |  |  |  |  |  |  |
Earnings per share attributable to discontinued operations, basic (dollars per share) | (0.01) | (0.04) | 0.05 | (0.03) | 0.00 | 0.01 | 0.02 | 0.01 | (0.02) | 0.03 | 0.03
Earnings per share attributable to discontinued operations, diluted (dollars per share) | $ (0.01) | $ (0.04) | $ 0.05 | $ (0.03) | $ 0.00 | $ 0.01 | $ 0.01 | $ 0.01 | $ (0.02) | $ 0.03 | $ 0.03

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