Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.21.2
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended
Dec. 12, 2020
Sep. 30, 2021
Minimum    
Initial Public Offering    
Threshold for reporting the disposition of a business on form eight K increase to conform to requirements for reporting business acquisitions, percentage   10.00%
Maximum    
Initial Public Offering    
Threshold for reporting the disposition of a business on form eight K increase to conform to requirements for reporting business acquisitions, percentage   20.00%
Earnout shares tranche one    
Initial Public Offering    
Volume weighted average price of shares   $ 12.50
Number of trading days for determining the volume weighted average share price   20 days
Number of consecutive trading days for determining the volume weighted average share price   30 days
Percentage of the earnout shares to be issued   50.00%
Earnout shares tranche two    
Initial Public Offering    
Volume weighted average price of shares   $ 15.00
Number of trading days for determining the volume weighted average share price   20 days
Number of consecutive trading days for determining the volume weighted average share price   30 days
Percentage of the earnout shares to be issued   50.00%
Tax receivable agreement obligation    
Initial Public Offering    
Percentage of realized tax benefits payable pursuant to an agreement   85.00%
Tax receivable agreement obligation | FoA Equity    
Initial Public Offering    
Tax Liability Pursuant To An Agreement   $ 35.1
Class B Units [Member] | Buy to Rent Platform Holdings L P [Member] | Finance of America Holdings LLC [Member]    
Initial Public Offering    
Stock redeemed or called during period value $ 203.2