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Shareholders' Equity - Issued and Outstanding Preferred Stock (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2025 | Jul. 31, 2024 | Dec. 31, 2024
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 10,215,000 |  | 10,215,000
Preferred stock, shares outstanding (in shares) | 10,215,000 |  | 10,215,000
Carrying Amount | $ 2,394,000 |  | $ 2,394,000
Preferred Series E |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 0 |  | 0
Preferred stock, shares outstanding (in shares) | 0 |  | 0
Preferred stock, liquidation preference per share (in USD per share) | $ 1,000 |  |
Preferred stock dividend rate (as a percent) | 0.00% |  |
Carrying Amount | $ 0 |  | $ 0
Preferred stock per share dividend amount (in USD per share) | $ 0 |  | $ 16.125
Preferred Series F |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 50,000 |  | 50,000
Preferred stock, shares outstanding (in shares) | 50,000 |  | 50,000
Preferred stock, liquidation preference per share (in USD per share) | $ 10,000 |  |
Preferred stock dividend rate (as a percent) | 5.125% |  |
Carrying Amount | $ 500,000 |  | $ 500,000
Preferred stock per share dividend amount (in USD per share) | $ 128.125 |  | $ 128.125
Preferred Series G |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 40,000 |  | 40,000
Preferred stock, shares outstanding (in shares) | 40,000 |  | 40,000
Preferred stock, liquidation preference per share (in USD per share) | $ 10,000 |  |
Preferred stock dividend rate (as a percent) | 7.304% | 5.00% |
Carrying Amount | $ 400,000 |  | $ 400,000
Preferred stock per share dividend amount (in USD per share) | $ 182.60 |  | $ 125.00
Preferred Series H |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 10,000,000 |  | 10,000,000
Preferred stock, shares outstanding (in shares) | 10,000,000 |  | 10,000,000
Preferred stock, liquidation preference per share (in USD per share) | $ 25 |  |
Preferred stock dividend rate (as a percent) | 5.625% |  |
Carrying Amount | $ 261,000 |  | $ 261,000
Preferred stock per share dividend amount (in USD per share) | $ 0.3516 |  | $ 0.3516
Preferred Series I |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 50,000 |  | 50,000
Preferred stock, shares outstanding (in shares) | 50,000 |  | 50,000
Preferred stock, liquidation preference per share (in USD per share) | $ 10,000 |  |
Preferred stock dividend rate (as a percent) | 3.50% |  |
Carrying Amount | $ 500,000 |  | $ 500,000
Preferred stock per share dividend amount (in USD per share) | $ 87.50 |  | $ 87.50
Preferred Series J |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 75,000 |  | 75,000
Preferred stock, shares outstanding (in shares) | 75,000 |  | 75,000
Preferred stock, liquidation preference per share (in USD per share) | $ 10,000 |  |
Preferred stock dividend rate (as a percent) | 7.50% |  |
Carrying Amount | $ 733,000 |  | $ 733,000
Preferred stock per share dividend amount (in USD per share) | $ 187.50 |  | $ 0

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