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

Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of Inventory Buyouts (Detail)

Fair Value - Summary of Inventory Buyouts (Detail) - Inventory Buyouts [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Minimum [Member] \| Loss severity [Member]
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss severity	2.40%	3.10%
Maximum [Member] \| Loss severity [Member]
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss severity	6.90%	7.70%
Weighted Average [Member] \| Conditional repayment rate [Member]
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Conditional repayment rate	44.90%	43.20%
Weighted Average [Member] \| Loss frequency [Member]
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss frequency	68.30%	59.40%
Weighted Average [Member] \| Loss severity [Member]
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Loss severity	4.90%	3.80%
Weighted Average [Member] \| Discount rate [Member]
Fair Value Inventory Buyouts Classified As Reverse Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Discount rate	5.80%	4.10%