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 the fair value and unpaid principal balance ("UPB") (Detail)

Fair Value - Summary of the fair value and unpaid principal balance ("UPB") (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	$ 10,316,027	$ 9,929,163
Unpaid Principal Balance
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	9,406,924	9,045,104
Mortgage Loans Held For Investment Subject To Nonrecourse Debt [Member] \| Estimated Fair Value \| Reverse Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	5,189,680	5,057,624
Mortgage Loans Held For Investment Subject To Nonrecourse Debt [Member] \| Estimated Fair Value \| Commercial Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	234,941	338,543
Mortgage Loans Held For Investment Subject To Nonrecourse Debt [Member] \| Unpaid Principal Balance \| Reverse Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	4,615,128	4,457,805
Mortgage Loans Held For Investment Subject To Nonrecourse Debt [Member] \| Unpaid Principal Balance \| Commercial Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	229,858	333,344
Mortgage Loans Held For Investment [Member] \| Estimated Fair Value \| Reverse Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	1,020,143	661,790
Mortgage Loans Held For Investment [Member] \| Estimated Fair Value \| Commercial Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	204,947	69,031
Mortgage Loans Held For Investment [Member] \| Unpaid Principal Balance \| Reverse Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	879,794	589,429
Mortgage Loans Held For Investment [Member] \| Unpaid Principal Balance \| Commercial Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	202,195	69,127
Mortgage Loans Held For Sale [Member] \| Estimated Fair Value \| Commercial Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	149,435	142,226
Mortgage Loans Held For Sale [Member] \| Estimated Fair Value \| Residential Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	1,908,107	2,080,585
Mortgage Loans Held For Sale [Member] \| Unpaid Principal Balance \| Commercial Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	144,789	140,693
Mortgage Loans Held For Sale [Member] \| Unpaid Principal Balance \| Residential Mortgage Loans [Member]
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	1,858,087	2,000,795
HMBS Related Obligations [Member] \| Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	10,168,224	9,788,668
HMBS Related Obligations [Member] \| Unpaid Principal Balance
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	9,406,924	9,045,104
Non Recourse Debt [Member] \| Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	5,360,603	5,257,754
Non Recourse Debt [Member] \| Unpaid Principal Balance
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	5,276,781	5,155,017
Non Recourse MSR Financing Liability [Member] \| Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	65,129	14,088
Non Recourse MSR Financing Liability [Member] \| Unpaid Principal Balance
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	$ 65,129	$ 14,088