Loans Held for Investment - Collateral Characteristics (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans	149,172	95,155,000
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	149,172	95,155
Weighted average maturity (years)	18 years 9 months 18 days	19 years 9 months 18 days
Weighted average loan to value	88.00%	86.90%
Weighted average FICO	631	627
Weighted average loan balance (in thousands) \| $	$ 91	$ 93
Weighted average percentage owner occupied	95.00%	96.60%
Weighted average percentage single family residence	86.00%	85.00%
Loans Held for Investment at Fair Value \| California \| 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%	10.00%
Loans Held for Investment at Fair Value \| Florida \| 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	7.20%	6.70%
Loans Held for Investment at Fair Value \| Ohio \| 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	6.10%	6.50%
Loans Held for Investment at Fair Value \| Pennsylvania \| 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%
Loans Held for Investment at Fair Value \| Virginia \| 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%	5.90%
Loans Held for Investment at Fair Value \| North Carolina \| 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		5.10%

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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