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