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Debt - Mortgages Segment, Master Repurchase Agreements Narrative (Detail) - Mortgages - USD ($)	Dec. 31, 2022	Mar. 18, 2022	Dec. 31, 2021
Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250,000,000
Credit Suisse AG, Cayman Islands
Debt Instrument [Line Items]
Short-term debt	23,000,000		$ 77,000,000
Credit Suisse AG, Cayman Islands | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	100,000,000	$ 100,000,000
Credit Suisse and Citibank, N.A
Debt Instrument [Line Items]
Short-term debt	$ 28,000,000		$ 87,000,000

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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