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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Capital Unit [Line Items] |  |  |  |
Preferred stock, par value (dollars per share) | $ 50,000 | $ 50,000 |  |
Cumulative preferred nonvoting stock (as a percent) | 4.50% | 4.50% |  |
Shares held in treasury (in shares) | 23,013,489 | 23,240,197 |  |
Preferred stock included in Treasury shares at cost line of the Consolidated Balance Sheet | $ 327,756 | $ 305,159 |  |
Common stock, shares authorized (in shares) | 180,000,000 | 180,000,000 |  |
Common stock, no par value (in dollars per share) | $ 0 | $ 0 |  |
Common stock, shares issued (in shares) | 62,081,391 | 62,081,391 |  |
Common stock, shares outstanding (in shares) | 39,067,902 | 38,841,194 |  |
Stock Issued During Period, Shares, Treasury Stock Reissued | 471,681 | 436,549 |  |
4 1/2% Cumulative Preferred Nonvoting Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Preferred stock, shares authorized | 100,000 |  |  |
Preferred stock, par value (dollars per share) | $ 50 |  |  |
Cumulative preferred nonvoting stock (as a percent) | 4.50% |  |  |
Preferred stock, callable price per share (dollars per share) | $ 52.50 |  |  |
Preferred stock, shares issued | 71,340 | 71,340 |  |
Shares held in treasury (in shares) | 52,998 | 52,878 |  |
Preferred stock included in Treasury shares at cost line of the Consolidated Balance Sheet | $ 1,800 |  |  |
Treasury purchases (in shares) | 120 | 0 |  |
Second Cumulative Preferred Voting Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Preferred stock, shares authorized | 1,000,000 |  |  |
Preferred stock, par value (dollars per share) | $ 10 |  |  |
Preferred stock, shares issued | 0 | 0 |  |
Common Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 62,081,391 | 62,081,391 | 62,081,391 | 62,081,391
Treasury |  |  |  |
Capital Unit [Line Items] |  |  |  |
Common stock, shares outstanding (in shares) | 23,013,489 | 23,240,197 | 23,554,868 | 23,858,463
Share Repurchase Program, May 2015 | Common Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Stock repurchased program, authorized amount (up to) | $ 100,000 |  |  |
Share Repurchase Program, May 2015 | Treasury |  |  |  |
Capital Unit [Line Items] |  |  |  |
Treasury purchases (in shares) | 175,000 | 33,465 | 0 |

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