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Capital Stock - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Capital Unit [Line Items] |  |  |
Preferred stock, par value (in dollars per share) | $ 50,000 | $ 50,000 |
Cumulative preferred nonvoting stock (as a percent) | 4.50% | 4.50% |
Treasury shares, at cost | $ 363,284 | $ 361,438 |
Common stock, shares authorized (in shares) | 180,000,000 | 180,000,000 |
Common stock, par value (in dollars per share) | $ 0 |  |
Common stock, shares issued (in shares) | 62,081,391 | 62,081,391 |
Common stock, shares, outstanding (in shares) | 39,317,212 | 39,213,064 |
Treasury Stock, Common, Shares | 22,764,179 | 22,868,327 |
Cumulative preferred stock |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares authorized (in shares) | 100,000 |  |
Preferred stock, par value (in dollars per share) | $ 50 |  |
Cumulative preferred nonvoting stock (as a percent) | 4.50% |  |
Preferred stock, callable price per share (in dollars per share) | $ 52.50 |  |
Preferred stock, shares issued (in shares) | 71,340 | 71,340 |
Purchase of treasury shares (in shares) | 0 |  |
Treasury Stock, Preferred, Shares | 52,998 | 52,998 |
Second cumulative preferred voting stock |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares authorized (in shares) | 1,000,000 |  |
Preferred stock, par value (in dollars per share) | $ 10 |  |
Preferred stock, shares issued (in shares) | 0 | 0 |
Common stock |  |  |
Capital Unit [Line Items] |  |  |
Purchase of treasury shares (in shares) | 0 | 251,408 | 0
Common stock, shares issued (in shares) | 62,081,391 | 62,081,391 |
Common stock, value, issued (up to) | $ 100,000 |  |
Treasury Stock, Common |  |  |
Capital Unit [Line Items] |  |  |
Reissued shares (in shares) | 132,797 | 219,214 |
Preferred stock |  |  |
Capital Unit [Line Items] |  |  |
Treasury shares, at cost | $ 1,800 |  |

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