Loans Held for Investment - Collateral Characteristics (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans	140,345	149,172
Loans Held for Investment at Fair Value \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans	140,345	149,172
Weighted average maturity (years)	18 years 7 months 24 days	18 years 9 months 18 days
Weighted average loan to value	87.50%	88.00%
Weighted average FICO	629	631
Weighted average loan balance (in thousands) \| $	$ 89	$ 91
Weighted average percentage owner occupied	90.10%	95.00%
Weighted average percentage single family residence	86.30%	86.00%
Loans Held for Investment at Fair Value \| CA \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	9.00%	9.00%
Loans Held for Investment at Fair Value \| FL \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	7.30%	7.20%
Loans Held for Investment at Fair Value \| OH \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	5.90%	6.10%
Loans Held for Investment at Fair Value \| NY \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	5.70%
Loans Held for Investment at Fair Value \| PA \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states	5.60%	5.60%
Loans Held for Investment at Fair Value \| VA \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top four states		5.50%

Indicates the number of mortgages under each classification.

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- Definition

Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]

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- Definition

The weighted average maturity period of underlying mortgages, which is based on their current face amounts.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average of underlying mortgages at amortized cost to their fair values determined using defined pricing methodologies.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average credit score of underlying mortgages based on their FICO ratings.

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No definition available.

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- Definition

As of the balance sheet date, the percentage of unpaid principal amount of underlying mortgages originated in a specified territory.

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No definition available.

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- Definition

As of the balance sheet date, the weighted average of unpaid principal amounts of underlying mortgages.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average of underlying mortgages that are owner occupied.

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No definition available.

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- Definition

As of the balance sheet date, the weighted average of underlying mortgages that are single family residences.

+ References

No definition available.

+ Details

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