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Common Stock Repurchase Programs - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2018
Common Stock [Line Items]
Common stock authorized for repurchase				$ 500,000
Common stock repurchased	$ 8,493	$ 145,280	$ 302,160
Company's Common stock repurchased			$ 107,200
Common Stock [Member]
Common Stock [Line Items]
Repurchased common stock, shares	500,000	5,100,000
Restricted Stock [Member]
Common Stock [Line Items]
Number of shares withheld to satisfy minimum statutory tax withholding obligations		96,918
Amount withheld to satisfy minimum statutory tax withholding obligations		$ 2,500

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Common Stock [Line Items]

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Amount of decrease to equity for grantee's tax withholding obligation for award under share-based payment arrangement.

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Amount of stock repurchase plan authorized.

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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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