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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Thousands								3 Months Ended		9 Months Ended
		Oct. 15, 2021 USD ($) shares	Sep. 15, 2021 USD ($) $ / shares	Aug. 25, 2021 shares	Jun. 15, 2021	Mar. 15, 2021	Jun. 15, 2020	Sep. 30, 2021 USD ($) series shares	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) series shares	Sep. 30, 2020 USD ($)	Dec. 31, 2020 shares
Capital Unit [Line Items]
Stock repurchase program, number of shares authorized to be repurchased				3,235,326
Percentage of company's outstanding shares				10.00%
Stock repurchase program, remaining period				1 year
Stock repurchased during period, shares								0
Preferred stock, number of series outstanding | series								2		2
Redemption of preferred stock | $	[1]							$ 79,677		$ 79,677
Loss on redemption of preferred stock | $								$ 2,820	$ 0	$ 2,820	$ 0
Preferred stock, shares outstanding (shares)								5,700,000		5,700,000		9,000,000
Subsequent Event
Capital Unit [Line Items]
Stock repurchased during period, shares		167,233
Stock repurchased during period, value | $		$ 7,200
Series C and D Preferred Stock
Capital Unit [Line Items]
Redemption of preferred stock | $			$ 82,500
Loss on redemption of preferred stock | $			$ 2,800
Series C Preferred Stock
Capital Unit [Line Items]
Preferred stock, redemption price per share (in usd per share) | $ / shares			$ 25.00
Preferred stock, shares outstanding (shares)								0		0
Stated rate (as a percent)							7.00%
Series C Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Spread on variable interest rate							5.30%
Series D Preferred Stock
Capital Unit [Line Items]
Preferred stock, redemption price per share (in usd per share) | $ / shares			$ 25.00
Preferred stock, shares outstanding (shares)								0		0
Stated rate (as a percent)						6.50%
Series D Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Spread on variable interest rate						5.09%
Series E Preferred Stock
Capital Unit [Line Items]
Stated rate (as a percent)					6.45%
Series E Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Spread on variable interest rate					5.14%
[1] Refer to NOTE 11 – SHAREHOLDERS' EQUITY for additional information about the redemption of Series C and Series D Preferred Stock.

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