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Shares Repurchased - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
	Apr. 11, 2018	Apr. 24, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Class of Stock [Line Items]
Repurchased common stock, value			$ 80,000	$ 424,000	$ 2,187,000	$ 1,430,000
Total Leverage Ratio	1.75 to 1.00
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Repurchased common stock, shares			13,300	47,816	338,578	135,041
Repurchased common stock, value			$ 80,000	$ 424,000	$ 2,187,000	$ 1,430,000
Dollar amount remaining available for future share repurchases			$ 83,542,000		$ 83,542,000
Share repurchase program, extended term date		Apr. 27, 2022

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Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

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Amount remaining of a stock repurchase plan authorized.

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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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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate 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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