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Shareholder's Equity - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Common stock, shares authorized | 2,810,000 | 2,810,000 | 4,000,000
Cost of reacquired shares | $ 5,488,000 | $ 7,956,000 |
par value | $ 0.10 | $ 0.10 |
Per share amount of paid in capital | $ 1.43 |  |
Description of cost allocation of reacquired shares | The cost of the cancelled shares was determined by use of the first-in, first out valuation method. The cost of reacquired shares was $28,775,000. The cost was allocated between the par value ($0.10) of the shares cancelled; the excess of cost over the par value to paid in capital based upon the average per share amount of paid in capital ($1.43) for all shares from the original issuance; and the excess was charged to retained earnings. |  |
Cancelled Shares [Member] |  |  |
Cost of reacquired shares | $ 28,775,000 |  |

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