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Share Repurchase Programs (Detail) - USD ($)	3 Months Ended		77 Months Ended
	Mar. 31, 2021	Dec. 31, 2019	Dec. 31, 2020	Aug. 31, 2014
Equity [Abstract]
Stock repurchase program, authorized amount				$ 50,000,000
Purchase of common stock, shares (in shares)	0		1,416,587
Common stock repurchased		$ 1,625,000	$ 22,300,000

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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