Finance of America Companies Inc. Annual report pursuant to Section 13 and 15(d)

Fair Value - Summary of Fix & Flip - Securitized Commercial Mortgage Loans (Detail)

Fair Value - Summary of Fix & Flip - Securitized Commercial Mortgage Loans (Detail) - Fix Flip Securitized Commercial Mortgage Loans [Member]	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Minimum [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		6.70%
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%	0.20%
Maximum [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		10.00%
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	69.00%	44.00%
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)	14.10%	17.10%
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	5.70%	6.70%
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%