Amendment Flag Current Fiscal Year End Date Document Period End Date Entities [Table] Entity [Domain] Entity Information [Line Items] Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Central Index Key Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] Receivable Type [Axis] Receivable Type [Axis] Accounts payable, accrued expenses and other liabilities Investment in Leases and Loans [Line Items] Accumulated amortization Amortization of deferred charges and discount on debt Adjustments to reconcile net loss to net cash provided by operating activities: Administrative expenses reimbursed to affiliate Recoveries ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY Allowance for Credit Losses [Text Block] Allowance for credit losses activity Charge-offs Allowance for Loan and Lease Losses, Write-offs Provisions for credit losses Term Securitization 2011-1 [Member] ASSETS Total assets Assets Basis of Presentation Total future minimum lease payments Residuals, net of unearned residual income Capital Leases, Net Investment in Direct Financing Leases, Unguaranteed Residual Values of Leased Property Unearned income Capital Leases, Net Investment in Direct Financing Leases, Deferred Income Direct financing leases and loans [Abstract] Investment in leases and loans, net Commercial finance assets Carrying Value [Member] Restricted cash pledged as collateral Cash Cash, beginning of period Cash, end of period (Decrease) increase in cash Cash, Period Increase (Decrease) COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] COMMITMENTS AND CONTINGENCIES [Abstract] Commitments and contingencies (note 11) Long-term debt Debt Instrument [Line Items] Schedule of Long-term Debt Instruments [Table] Maturity date, upper range Debt Debt Instrument, Fair Value Disclosure DEBT Debt Disclosure [Text Block] DEBT [Abstract] Asset-backed notes face amount Debt Instrument, Face Amount Maturity date, lower range Interest rate (in hundredths) Interest rate, maximum (in hundredths) Net unamortized original issue discount Interest rate, minimum (in hundredths) Debt Instrument, Interest Rate, Effective Percentage Rate Range, Minimum Interest rate (in hundredths) Debt Instrument, Interest Rate, Stated Percentage Deferred financing costs, net Deferred financing costs DEFERRED FINANCING COSTS [Abstract] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] DERIVATIVE INSTRUMENTS [Abstract] Mark to market losses on derivative liabilities Due to affiliates Due to Related Parties Fair Value [Member] Gain on extinguishment of debt Gain on extinguishment of debt Fair Value, Hierarchy [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair value disclosure, liabilities [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] FAIR VALUE MEASUREMENT [Abstract] FAIR VALUE MEASUREMENT Fair Value Disclosures [Text Block] Carrying value and fair value of funds Level 3 [Member] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Investments in Commercial Finance Assets Direct Financing Leases [Member] Fair value of financial instruments for which it is practicable to estimate that value [Abstract] Aging of investment in leases and loans [Abstract] Ending balance, individually evaluated for impairment Investment in leases and loans [Line Items] Allowance for credit losses activity [Abstract] Credit Quality Indicator [Axis] Delinquent [Abstract] Allowance for credit loss [Abstract] Ending balance individually evaluated for impairment Financing Receivable, by Credit Quality Indicator [Domain] Current Financing Receivable, Recorded Investment, Current Allowance for credit losses Allowance for credit losses Credit quality indicators Ending balance collectively evaluated for impairment Ending balance, collectively evaluated for impairment Gains on sale of equipment and lease dispositions, net Gain (Loss) on Sale of Property Plant Equipment Gains on sale of equipment and lease dispositions, net Gain on extinguishment of debt Gains (Losses) on Extinguishment of Debt General Partner Amount [Member] General and administrative expenses General partner Recorded investment in leases and term loans [Abstract] Consolidated Statements of Operations (Unaudited) [Abstract] Due to affiliates Increase (Decrease) in Partners' Capital [Roll Forward] Increase (Decrease) in Partners' Capital [Roll Forward] Accounts payable, accrued expenses, and other liabilities Changes in operating assets and liabilities: Loss on derivative activities Increase (Decrease) in Fair Value of Derivative Instruments, Not Designated as Hedging Instruments Other assets Increase (Decrease) in Other Operating Assets Decrease in restricted cash Increase (Decrease) in Restricted Cash Interest expense Interest on equipment financings Cash paid for interest Subordinated notes payable Subordinated notes payable Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Late fee income Late Fee Income Generated by Servicing Financial Assets, Amount Liabilities: Total liabilities Liabilities LIABILITIES AND PARTNERS' (DEFICIT) CAPITAL Total liabilities and capital Liabilities and Equity Limited Partners [Member] Limited partners Balance (in units) Balance (in units) Limited Partners' Capital Account, Units Outstanding Ownership interest (in hundredths) Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY [Abstract] Leases and loan pledged as collateral Allowance for credit losses, beginning of period Allowance for credit losses end of period Balance, end of period Loans and Leases Receivable, Allowance Total aged investment in leases and loans Loans and Leases Receivable, Gross Investment in leases and loans, gross Loans and Leases Receivable, Net of Deferred Income Loans [Member] Loans Receivable [Member] Investment in leases and loans, net Loans and Leases Receivable, Net Amount INVESTMENT IN LEASES AND LOANS Loans, Notes, Trade and Other Receivables Disclosure [Text Block] September 30, 2013 Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months September 30, 2015 Long-term Debt, Maturities, Repayments of Principal in Rolling Year Three Total Long-term Debt September 30, 2016 Long-term Debt, Maturities, Repayments of Principal in Rolling Year Four September 30, 2014 Long-term Debt, Maturities, Repayments of Principal in Rolling Year Two Debt repayments over the next five annual periods [Abstract] Thereafter September 30, 2017 Long-term Debt, Maturities, Repayments of Principal in Rolling Year Five Management fees Management fee description Nonperforming [Member] ORGANIZATION AND NATURE OF BUSINESS Nature of Operations [Text Block] Cash flows from financing activities: Net cash provided by investing activities Net Cash Provided by (Used in) Investing Activities Net loss allocated to LEAF 4's limited partners Net Income (Loss) Allocated to Limited Partners Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Cash flows from investing activities: Net loss attributable to LEAF 4 partners Net Income (Loss) Allocated to General Partners Cash flows from operating activities: Net loss per weighted average limited partner unit (in dollars per share) Net loss Net loss Net loss Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Less: Net loss (income) attributable to the noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest Other Income [Abstract] Investment in leases and loans Financing Receivable, Net Non-Controlling Interest [Member] Expenses: Expenses Operating Expenses Depreciation on operating leases Rental income ORGANIZATION AND NATURE OF BUSINESS [Abstract] Other assets Other income Performing [Member] Age analysis Past Due Financing Receivables [Table Text Block] Total Partners' (Deficit) Capital [Member] Statement, Partner Capital Components [Axis] Partner Capital Components [Domain] Total partners' capital Partners' Capital Partners' (Deficit) Capital: Cash distributions paid Partners' Capital Account, Distributions Units sold during offering termination date (in units) Partners' Capital Account, Units, Sold in Public Offering Funds raised during offering termination date Partners' Capital Account, Public Sale of Units Noncontrolling interest Total capital Balance Balance Partners' Capital, Including Portion Attributable to Noncontrolling Interest Termination of financial derivatives Payments for (Proceeds from) Derivative Instrument, Financing Activities Cash distributions to partners Payments of Capital Distribution Purchases of leases and loans Payments to Acquire Loans and Leases Held-for-investment Increase in deferred financing costs Payments of Financing Costs Borrowings of debt Security deposits returned, net of collections Proceeds from leases and loans Equipment Investment in operating leases, net [Abstract] Property Subject to or Available for Operating Lease, Net [Abstract] Accumulated depreciation Property Subject to or Available for Operating Lease, Accumulated Depreciation Provision for credit losses Receivable Type [Domain] Receivable Type [Domain] INVESTMENT IN LEASES AND LOANS [Abstract] CERTAIN RELATIONSHIPS AND TRANSACTIONS WITH AFFILIATES Related Party Transactions Disclosure [Text Block] Administrative expenses CERTAIN RELATIONSHIPS AND TRANSACTIONS WITH AFFILIATES [Abstract] Repayment of debt Repayments of Bank Debt Restricted cash Revenues Revenues Revenues: Schedule of Cost Method Investee, Name [Axis] Schedule of debt Debt repayments Schedule of Cost - Method Investments [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Summary of related party fees Schedule of Consolidated Investments [Line Items] Components of direct financing leases and loans Schedule of Financing Receivables, Minimum Payments [Table Text Block] Net operating leases Schedule of Property Subject to or Available for Operating Lease [Table Text Block] Investment in Leases and Loans [Table] Net leases and loan investments Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Debt Pledged as collateral on the 2011-1 Term Securitization Security Owned and Pledged as Collateral, Fair Value Security deposits Security Deposit Liability SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Statement [Table] Statement [Line Items] Consolidated Statement of Changes in Partners' (Deficit) Capital (Unaudited) [Abstract] Consolidated Statements of Cash Flows (Unaudited) [Abstract] Consolidated Balance Sheets (Unaudited) [Abstract] Supplemental Cash Flow Disclosure: Loss on derivative hedging activities Unrealized Gain (Loss) on Derivatives Use of Estimates Weighted average number of limited partner units outstanding during the period (in shares) LEAF Commercial Finance Fund, LLC LEAF Commercial Finance Fund, LLC [Member] The number of classes of asset-backed notes issued, in upper range. Number Of Classes Of Asset Backed Notes Upper Range Number of classes of asset-backed notes, upper range The number of classes of asset-backed notes issued, in lower range. Number Of Classes Of Asset- Backed Notes, Lower Range Number of classes of asset-backed notes, lower range The number of classes of asset-backed notes issued that have varying maturity dates. Number of classes of asset backed notes Number of classes of asset-backed notes Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans. Term Securitization 2010-3 [Member] Term Securitization 2010-3 [Member] Securities that are primarily serviced by the cash flows of a discrete pool of receivables or other financial assets for example, but not limited to, credit card receivables, car loans, recreational vehicle loans, and mobile home loans. Term Securitization 2010-1 [Member] Term Securitization 2010-1 [Member] Amount of management fees waived by the General Partner. Management Fees Waived Management fees waived The percentage of cumulative annual return on limited partners capital contributions, as adjusted by distributions deemed to be a return of capital. Percentage Of Cumulative Annual Return On Limited Partners Capital Contributions Percentage of cumulative annual return on the limited partners capital contributions (in hundredths) Element represents the investment period of the fund. Funds investment period Fund's investment period The rate (based on full payout leases ) of fee for management of the day-to-day business functions of the entity. Management Fee Rate Based on full payout leases Management fee rate based on full payout leases (in hundredths) The rate (based on gross rental payments for operating leases) of fee for management of the day-to-day business functions of the entity. Management Fee Rate Based on gross rental payments Management fee rate based on gross rental payments (in hundredths) Recorded investment in financing receivables that are contractually current but there is uncertainty as to collectability of future payments due. Financing Receivable, Recorded Investment, Cost Recovery Method Contractually current but is recorded using cost recovery method The percentage of all aged lease and loan receivables Percentage Of All Aged Receivables Percentage of all aged receivables (in hundredths) The percentage related to aged lease and loan receivables greater than 91 past due. Past Due Greater Than91 Days Percentage Of All Aged Receivables Greater than 91 days, percentage of all aged receivables (in hundredths) Leases and loans receivables that are greater than 91 past due. Past Due Greater Than91 Days Greater than 91 Days Past due The percentage related to aged lease and loan receivables 31 to 91 past due. Past Due31 To91 Days Percentage Of All Aged Receivables 31 to 91 days past due, percentage of all aged receivables (in hundredths) Leases and loans receivables that are 31 to 91 past due. Past Due31 To91 Days 31 to 91 days past due The percentage related to current aged lease and loan receivables. Current Percentage Of All Aged Receivables Current, percentage of all aged receivables (in hundredths) The maximum interest rate for loans. Loan Interest Rate Maximum Loan interest rate, maximum (in hundredths) The minimum interest rate for loans. Loan Interest Rate Minimum Loan interest rate, minimum (in hundredths) The initial lease term, at maximum, of direct financing lease during the period. Direct Financing Initial Lease Term Maximum Direct financing initial lease term, maximum The initial lease term, at minimum, of direct financing lease during the period. Direct Financing Initial Lease Term Minimum Direct financing initial lease term, minimum Financing arrangement that represents a contractual right to receive money either on demand or on fixed or determinable dates related to consumer credit cards. Consumer Credit Card Financing Receivable Future Payment Card [Member] Future Payment Card Receivables [Member] Amount representing operating leases receivables before deducting allowances. Operating Lease Receivable [Member] Operating Leases [Member] Remaining balance is fully-reserved less an estimated recovery amount. Remaining period of due on monthly payment Delinquency period with full allowance The period of default on monthly payment when income is not recognized in leases and loans. Period of default on monthly payment Period of default on monthly payment The estimated useful life for straight-line basis depreciation on operating lease equipment. Operating Lease Equipment Useful Life Operating lease equipment useful life The percentage ownership of the investee held using cost method accounting. Cost method investee ownership percentage Ownership interest (in hundredths) A related party fund where the entity owns interest. LEAF Funds JV1 [Member] LEAF Funds JV1 [Member] A related party fund where the entity owns interest. LEAF Funds JV2 [Member] LEAF Funds JV2 [Member] Type of cost method investment. Cost Method Investee [Domain] Cost Method Investee, Name [Domain] The percentage of General Partner's limited partnership interest in the fund. General Partner S Limited Partnership Interest General Partner's limited partnership interest (in hundredths) The amount of General Partner's limited partnership ownership interests in the fund. General Partner S Investment In Limited Partnership General Partner's investment in limited partnership interest The expected subsequent liquidation period of the fund. Expected Subsequent Liquidation Period Expected subsequent liquidation period The expected reinvestment period of the fund. Expected Reinvestment Period Expected reinvestment period The expected offering period of the fund. Expected Offering Period Expected offering period A period in the funds life cycle that fees will be subordinated per the partnership agreement. Fees subordination period Total expected life of the fund The entire disclosure of a borrowing that has a lower priority than senior instruments in case of liquidation of the entity's assets. SUBORDINATED NOTES PAYABLE [Text Block] SUBORDINATED NOTES PAYABLE SUBORDINATED NOTES PAYABLE [Abstract] The entire disclosure of the nature and amounts of deferred finance costs. These are costs relating to undertaking a financing with a third party. Can also be known as deferred loan costs or deferred debt issue costs. DEFERRED FINANCING COSTS [Text Block] DEFERRED FINANCING COSTS Document and Entity Information [Abstract]