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Capital Stock - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Capital Unit [Line Items] |  |  |  |
Preferred stock, par value (dollars per share) | $ 50 | $ 50 |  |
Cumulative preferred nonvoting stock (as a percent) | 4.50% | 4.50% |  |
Shares held in treasury (in shares) | 23,858,463 | 24,344,813 |  |
Preferred stock included in Treasury shares at cost line of the Consolidated Balance Sheet | $ 297,834 | $ 289,254 |  |
Common stock, shares authorized | 180,000,000 | 180,000,000 |  |
Common stock, par value (dollars per share) | $ 0 | $ 0 |  |
Common stock, shares outstanding | 38,222,928 | 37,736,578 |  |
Stock Issued During Period, Shares, Treasury Stock Reissued | 648,164 | 40,429 |  |
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 |  |  |
Shares held in treasury (in shares) | 52,878 |  |  |
Preferred stock repurchased and subsequently canceled (in shares) |  |  | 33 |
Preferred stock included in Treasury shares at cost line of the Consolidated Balance Sheet | $ 1,800 |  |  |
Treasury purchases (in shares) | 0 | 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 | 62,081,391 | 62,081,391 | 62,081,391 | 62,081,391
Treasury |  |  |  |
Capital Unit [Line Items] |  |  |  |
Common stock, shares outstanding | 23,858,463 | 24,344,813 | 24,708,917 | 24,633,081
Share Repurchase Program, May 2015 | Common Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Treasury purchases (in shares) | 168,941 |  |  |
Stock repurchased program, authorized amount (up to) | $ 100,000 |  |  |
Share Repurchase Program, May 2015 | Treasury |  |  |  |
Capital Unit [Line Items] |  |  |  |
Treasury purchases (in shares) |  | 0 | 150,000 |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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