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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended
	Dec. 15, 2021	Sep. 15, 2021 USD ($) $ / shares	Jun. 15, 2021	Mar. 15, 2021	Sep. 30, 2022 USD ($) series shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) series shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 shares	Aug. 25, 2021 shares
Capital Unit [Line Items]
Stock repurchase program, number of shares authorized to be repurchased | shares										3,235,326
Percentage of company's outstanding shares										10.00%
Stock repurchase program, additional term (in years)										1 year
Repurchase of common shares (in shares) | shares							664,145
Repurchase of common shares | $							$ 27,820
Preferred stock, number of series outstanding | series					2		2
Redemption of preferred stock | $						$ 79,677		$ 79,677
Loss on redemption of preferred stock | $					$ 0	$ 2,820	$ 0	$ 2,820
Preferred stock, shares outstanding (shares) | shares					5,700,000		5,700,000		5,700,000
Series C and D Preferred Stock
Capital Unit [Line Items]
Redemption of preferred stock | $		$ 82,500
Loss on redemption of preferred stock | $					$ 2,800		$ 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) | shares					0		0
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) | 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%
Series F Preferred Stock
Capital Unit [Line Items]
Stated rate (as a percent)	6.00%
Series F Preferred Stock | London Interbank Offered Rate (LIBOR)
Capital Unit [Line Items]
Spread on variable interest rate	4.762%

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