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Capital Stock - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
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 | $ 398,204 | $ 363,284 |
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) | 39,260,080 | 39,317,212 |
Treasury Stock, Common, Shares | 22,821,311 | 22,764,179 |
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) | 166,292 | 0 | 251,408
Common stock, shares issued (in shares) | 62,081,391 | 62,081,391 |
Common stock, value, issued (up to) | $ 200,000 |  |
Treasury Stock, Common |  |  |
Capital Unit [Line Items] |  |  |
Reissued shares (in shares) | 149,179 | 132,797 |
Preferred stock |  |  |
Capital Unit [Line Items] |  |  |
Treasury shares, at cost | $ 1,800 |  |

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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