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Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Repurchased During Period, Shares	197,570	103,943	0
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)	$ 155.14	$ 141.64
Stock Repurchased During Period, Value	$ 30,651	$ 14,723	$ 0
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	19,001	27,700	22,981
Dividends Payable, Amount Per Share	$ 0.70	$ 2.80	$ 2.80
Dividends	$ 11,361	$ 45,552	$ 45,247

X

- Definition

Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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- Definition

Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

+ References

No definition available.

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X

- Definition

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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Total cost of shares repurchased divided by the total number of shares repurchased.

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