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Shareholder's Equity - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Common stock, shares authorized 2,810,000 4,000,000
Cost of reacquired shares $ 7,956 $ 5,650
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.