Annual report pursuant to Section 13 and 15(d)

Variable Interest Entities and Securitizations - Additional Information (Detail)

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Variable Interest Entities and Securitizations - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2021
Jun. 30, 2021
Apr. 30, 2021
Feb. 28, 2021
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entities and Securitizations [Line Items]                
Interest retained on issuer residual interest certificates Initial fair value $ 55,614       $ 55,614 $ 55,614    
Finance of america commercial LLC [Member] | CAPT Two Thousand And Twenty One Securitization [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Percentage of beneficial interest in securitized trust           5.00%    
FAM [Member] | HAWT 2021-INV1 securitization [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Percentage of beneficial interest in securitized trust   5.00%            
FAM Mortgage Loan [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Transfer of mortgage loans held-for-sale at initial fair value 58,100       58,100 $ 58,100    
Servicing asset recognized on sale of mortgage loan 4,400       4,400 4,400    
Proceeds from securitizations of loans held-for-investment           1,117,000    
Gain (loss) on sale of mortgage loans 40,400              
Charge off expenses on transferred mortgage loan         0      
Repayments of debt       $ 294,200        
Transferred mortgage loans realized losses             $ 2,500 $ 0
FAM Mortgage Loan [Member] | Principal [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Repayments of debt     $ 239,800          
FAM Mortgage Loan [Member] | Interest [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Repayments of debt     6,300          
FAM Mortgage Loan [Member] | Discount [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Repayments of debt     $ 3,700          
FAM Mortgage Loan [Member] | FAM [Member] | Financial Asset 60 Days Or Less Past Due [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Mortgage loans transferred to unconsolidated securitization trusts amount 400       400 400    
2018 & 2019, and 2020 ANTLR securitizations [Member] | Finance of america commercial LLC [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Repayments of debt           175,300    
Agricultural Loans [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Proceeds from securitizations of loans held-for-investment           31,200    
Interest retained on issuer residual interest certificates Initial fair value 9,300       9,300 9,300    
Consolidated balance Of Agricultural loans 118,600       118,600 118,600    
Agricultural Loans [Member] | Nonrecourse [Member]                
Variable Interest Entities and Securitizations [Line Items]                
Initial fair value of loans transferred 166,100       166,100 166,100    
Liability transferred to the Variable interest entity Fair Value amount $ 111,700       $ 111,700 $ 111,700