Finance of America Companies Inc. Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of Fix & Flip - Securitized Commercial Mortgage Loans (Detail) - Fix Flip Securitized Commercial Mortgage Loans [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Minimum [Member] \| Loss frequency [Member]
Fair Value Fix And Flip Mortgage Loan Securitized Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss frequency	0.30%	0.30%
Maximum [Member] \| Loss frequency [Member]
Fair Value Fix And Flip Mortgage Loan Securitized Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss frequency	72.90%	69.00%
Weighted Average [Member] \| Prepayment Rate [Member]
Fair Value Fix And Flip Mortgage Loan Securitized Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Prepayment rate (SMM)	14.40%	14.10%
Weighted Average [Member] \| Discount rate [Member]
Fair Value Fix And Flip Mortgage Loan Securitized Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Discount rate	7.50%	5.70%
Weighted Average [Member] \| Loss frequency [Member]
Fair Value Fix And Flip Mortgage Loan Securitized Held For Investment Subject To Nonrecourse Debt Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss frequency	0.60%	0.60%