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Shareholders' Equity - Narrative (Detail) $ / shares in Units, $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2021 | Sep. 15, 2021 USD ($) $ / shares | Aug. 25, 2021 shares | Jun. 15, 2021 | Mar. 15, 2021 | Jun. 30, 2022 USD ($) series shares | Jun. 30, 2022 USD ($) series shares | Dec. 31, 2021 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 |  |  |  |  |
Repurchase of common shares (in shares) |  |  |  |  |  | 548,821 | 664,145 |
Repurchase of common shares | $ |  |  |  |  |  | $ 21,510 | $ 27,820 |
Preferred stock, number of series outstanding | series |  |  |  |  |  | 2 | 2 |
Preferred stock, shares outstanding (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 |  |  |  |  |  |
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 |
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% |  |  |  |
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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