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Shares Repurchased - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Apr. 11, 2018	Apr. 24, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class of Stock [Line Items]
Repurchased common stock, value			$ 2,341,000	$ 2,885,000	$ 7,891,000
Total Leverage Ratio	1.75 to 1.00
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Repurchased common stock, shares			370,428	334,953	697,664
Repurchased common stock, value			$ 2,341,000	$ 2,885,000	$ 7,891,000
Dollar amount remaining available for future share repurchases			$ 83,389,000
Share repurchase program, extended term date		Apr. 27, 2022

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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