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Share Repurchase Program - Additional Information (Detail) - USD ($)		1 Months Ended			12 Months Ended
	Nov. 05, 2018	Jan. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Equity Class Of Treasury Stock [Line Items]
Common stock, par value	$ 0.10				$ 10		$ 10
Amount paid for common shares purchase					$ 2,604,000	$ 7,287,000
Common Stock
Equity Class Of Treasury Stock [Line Items]
Number of shares intended to repurchase under repurchase program		$ 2,604,000	$ 3,921,000	$ 3,366,000	$ 2,604,000	$ 7,287,000
Shares repurchase program, expiration date	Mar. 08, 2019
Number of shares purchased		158,048	255,500	196,858	158,048	452,358
Average price paid per share		$ 16.48	$ 15.35	$ 17.10	$ 16.48	$ 16.11
Common Stock | Maximum
Equity Class Of Treasury Stock [Line Items]
Number of shares intended to repurchase under repurchase program	$ 20,000

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Face amount or stated value per share of common stock.

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