Quarterly report pursuant to Section 13 or 15(d)

Fair Value - Summary of Commercial Mortgage Single Rental Loans (Detail)

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Fair Value - Summary of Commercial Mortgage Single Rental Loans (Detail) - Commercial Mortgage Single Rental Loans [Member]
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Minimum [Member] | Prepayment Rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Prepayment rate (CPR) 18.00% 1.00%
Minimum [Member] | Default Rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Default rate (CDR)   1.00%
Maximum [Member] | Prepayment Rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Prepayment rate (CPR) 25.00% 17.10%
Maximum [Member] | Default Rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Default rate (CDR)   57.20%
Weighted Average [Member] | Prepayment Rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Prepayment rate (CPR) 18.30% 14.20%
Weighted Average [Member] | Discount rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Discount rate 5.10% 3.30%
Weighted Average [Member] | Default Rate [Member]    
Fair Value Single Rental Loan SRL Classified Under Mortgage Loans Held For Sale Measured On Recurring And Nonrecurring Basis Fair Value Measurement [Line Items]    
Default rate (CDR) 1.00% 2.20%