Aggregate adverse fair value adjustments.

No definition available.

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Namespace Prefix:	ck0001409970_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of financing receivable held as assets ninety days or more past due.

+ References

No definition available.

+ Details

Name:	ck0001409970_FairValueOfFinancingReceivableHeldAsAssetsNinetyDaysOrMorePastDue
Namespace Prefix:	ck0001409970_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Financing receivable recorded investment equal to greater than ninety days past due.

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0001409970_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Long Term Notes Maturity Term

+ References

No definition available.

+ Details

Name:	ck0001409970_LongTermNotesMaturityTerm
Namespace Prefix:	ck0001409970_
Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of loans.

+ References

No definition available.

+ Details

Name:	ck0001409970_NumberOfLoans
Namespace Prefix:	ck0001409970_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the highest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

When presenting a range of interest rates, the lowest effective rate for funds borrowed under the debt agreement as of the balance sheet date.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentageRateRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentPaymentTerms
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets); the fair value of which assets and liabilities was or is measured on a recurring basis using significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Member Loans at Fair Value and Notes and Certificates at Fair Value - Additional Information (Detail) (USD $)	6 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended			12 Months Ended	6 Months Ended
	Jun. 30, 2013 Loan	Dec. 31, 2012 Loan	Jun. 30, 2013 Member Loans At Fair Value	Jun. 30, 2012 Member Loans At Fair Value	Jun. 30, 2013 Member Loans At Fair Value	Jun. 30, 2012 Member Loans At Fair Value	Dec. 31, 2012 Member Loans At Fair Value	Jun. 30, 2013 Notes And Certificates At Fair Value	Dec. 31, 2012 Notes And Certificates At Fair Value	Jun. 30, 2013 Notes And Certificates At Fair Value Investment Income	Jun. 30, 2012 Notes And Certificates At Fair Value Investment Income	Jun. 30, 2013 Notes And Certificates At Fair Value Investment Income	Jun. 30, 2012 Notes And Certificates At Fair Value Investment Income	Jun. 30, 2013 90 days Loan	Dec. 31, 2012 90 days Loan	Jun. 30, 2013 Minimum	Jun. 30, 2013 Maximum	Jun. 30, 2013 Scenario 1	Jun. 30, 2013 Scenario 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes and certificates term																		P36M	P60M
Notes and certificates, payment frequency	Monthly
Notes and certificates, fixed interest rate																5.42%
Notes and certificates, fixed interest rate																	25.28%
Notes and certificates, maturity date description	Various maturity dates through June 2018
Fair value assets measured on recurring basis gain and loss included in investment income			$ 13,000,000	$ 3,500,000	$ 22,300,000	$ 8,300,000
Net fair value adjustment gains/(losses)										7,000	49,000	23,000	89,000
Number of loans	290	222												778	576
Financing receivable recorded investment equal to greater than 90 days past due			3,000,000		3,000,000		2,400,000	3,000,000	2,400,000					8,700,000	6,400,000
Aggregate adverse fair value adjustments								400,000	300,000					7,700,000	5,700,000
Fair value of financing receivable held as assets 90 days or more past due								$ 400,000	$ 300,000					$ 1,000,000	$ 700,000