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

Annual report pursuant to Section 13 and 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	Dec. 31, 2021	Dec. 31, 2020
Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	$ 10,556,054	$ 9,929,163
Unpaid Principal Balance	9,849,835	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	5,823,301	5,057,624
Unpaid Principal Balance	5,165,479	4,457,805
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	394,893	338,543
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	388,788	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	940,605	661,790
Unpaid Principal Balance	815,426	589,429
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	90,723	69,031
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	89,267	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	149,425	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	1,902,953	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	145,463	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	1,859,788	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	10,422,358	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	9,849,835	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	5,857,069	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	5,709,946	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		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		$ 14,088
Nonrecourse Commercial Loan [Member] \| Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	111,738
Nonrecourse Commercial Loan [Member] \| Unpaid Principal Balance
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	107,744
Nonrecourse Mortgage Service Rights [Member] \| Estimated Fair Value
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Estimated Fair Value	142,435
Nonrecourse Mortgage Service Rights [Member] \| Unpaid Principal Balance
Fair Value Summary Of The Fair Value And Unpaid Principal Balance Upb [Line Items]
Unpaid Principal Balance	$ 142,435