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 Commercial Mortgage Agricultural Loans (Detail)

Fair Value - Summary of Commercial Mortgage Agricultural Loans (Detail) - Commercial Mortgage Agricultural Loans [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Minimum [Member] \| Prepayment Rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Prepayment rate (SMM)	9.00%	9.00%
Minimum [Member] \| Default Rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Default rate (CDR)	0.00%	0.00%
Maximum [Member] \| Prepayment Rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Prepayment rate (SMM)	100.00%	100.00%
Maximum [Member] \| Default Rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Default rate (CDR)	1.00%	0.70%
Weighted Average [Member] \| Discount rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Discount rate	6.20%	4.80%
Weighted Average [Member] \| Prepayment Rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Prepayment rate (SMM)	19.60%	22.10%
Weighted Average [Member] \| Default Rate [Member]
Fair Value Agricultural Loans Classified Under Mortgage Loans Held For Investment Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]
Default rate (CDR)	0.90%	0.90%