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Stockholders' Equity - Summary of Authorized Outstanding Preferred and Common Stock (Detail) - $ / shares | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Common stock, shares authorized | 40,000,000 | 40,000,000 |
Common stock, shares outstanding | 32,719,852 | 32,694,268 | 32,603,926
Common stock, par value | $ 1.00 | $ 1.00 |
Common stock dividend payment terms | As declared |  |
Common stock, voting rights | Voting |  |
Senior Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized | 10,000,000 | 10,000,000 |
Preferred stock, shares outstanding | 0 |  |
Preferred stock, par value | $ 1.00 | $ 1.00 |
Preferred stock, dividend payment terms | As declared |  |
Preferred stock, voting rights | Voting |  |
Cumulative Preferred Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares authorized | 900,000 | 900,000 |
Preferred stock, shares outstanding | 0 |  |
Preferred stock, par value | $ 5.00 | $ 5.00 |
Preferred stock, dividend payment terms | As declared |  |
Preferred stock, voting rights | Non-voting |  |

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