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Summary of Changes in Stockholders Equity (Parenthetical) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Equity [Abstract]
Dividends paid to stockholders, per share	$ 0.36	$ 0.34
Cumulative effect of change in accounting principle, taxes		$ 6,054
Declaration Date	Feb. 21, 2020	Feb. 22, 2019
Record Date	Mar. 06, 2020	Mar. 08, 2019
Payable Date	Mar. 20, 2020	Mar. 22, 2019
Amount per Share of Common Stock	$ 0.36	$ 0.34
Total	$ 42,567	$ 39,905

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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Amount of the related income tax effect of a cumulative effect on retained earnings.

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