Amendment Flag Current Fiscal Year End Date Document Period End Date Entity [Domain] Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Legal Entity [Axis] Document Type Receivable from Investment in BHMI, LLC Financial Highlights Additional Financial Information Disclosure [Text Block] ASSETS Total Assets Assets Restricted and Unrestricted Cash Unrestricted cash Restricted and Unrestricted Cash [Abstract] Commodity Contract [Member] Derivative Instrument Risk [Axis] Derivatives and Hedging Derivative Instruments and Hedging Activities Disclosure [Text Block] Options written Derivatives and Hedging [Abstract] Derivative Contract Type [Domain] Other Pronouncements Financial Highlights [Abstract] Accrued brokerage fees (MS&Co.) Net Loss Per Unit Equity Method Investee, Name [Domain] Equity Contract [Member] Fair Value Measurements and Disclosures [Abstract] Fair Value Measurements and Disclosures Fair Value Disclosures [Text Block] Options purchased Financial Instruments Financial Instruments Disclosure [Text Block] Brokerage fees (MS&Co.) Foreign Currency [Member] Foreign Exchange Contract [Member] Forward Contracts [Member] Future Contract [Member] Future [Member] General Partner [Member] General Partner General Partner, Units (in units) Statements of Income and Expenses [Abstract] Income Taxes Income Taxes [Abstract] Statement of change in Partners' Capital [Roll Forward] Interest receivable (MSSB) Interest Rate Contract [Member] Interest income (MSSB) INVESTMENT INCOME Investment Secondary Categorization [Axis] Investment Type Categorization [Domain] Net unrealized gain/(loss) on open contracts Unrealized Currency Gain/(Loss) Fair value Investment Holdings [Line Items] Investment Type [Axis] Investment Holdings [Table] Percentage of Partners' Capital (in hundredths) Investments by Secondary Categorization [Domain] Investments Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Financial Instruments [Abstract] LIABILITIES Total Liabilities Liabilities LIABILITIES AND PARTNERS' CAPITAL Total Liabilities and Partners' Capital Liabilities and Equity Limited Partners [Member] Limited Partner [Member] Limited Partners, Units (in units) Limited Partners Limited Partners Net Income (Loss) Allocated to Limited Partners General Partner (in dollars per unit) General Partner Net Income (Loss) Allocated to General Partners Limited Partners (in dollars per unit) Net Loss NET LOSS Other Pronouncements [Abstract] Management fees Incentive fees EXPENSES Total Expenses Operating Expenses Options Contracts [Member] Options Held [Member] Organization [Abstract] Organization Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Statement, Partner Capital Components [Axis] Partner Capital Components [Domain] Redemptions Balance Balance Total Partners' Capital Partners' Capital PARTNERS' CAPITAL Balance (in units) Balance (in units) Partners' Capital Account, Units Redemptions (in units) Net Loss Allocation Redemptions payable Proceeds from litigation Net realized Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions [Abstract] Restricted cash Condensed Schedule of Investments [Abstract] Schedule of Equity Method Investment, Equity Method Investee, Name [Axis] Statement [Table] Statement [Line Items] Statement of change in Partners' Capital [Abstract] Statements of Financial Condition [Abstract] Subsequent Events Subsequent Events [Text Block] Subsequent Events [Abstract] Net change in unrealized WEIGHTED AVERAGE NUMBER OF UNITS OUTSTANDING (in units) Document and Entity Information [Abstract] Total trading results including other miscellaneous items. Total Trading Results Total Trading Results The net unrealized gains or losses on investment in the underlying and related trading entity. Unrealized Investment Gains Losses In Related Trading Company Unrealized appreciation (depreciation) on investment The net realized gains or losses on investment in the underlying and related trading entity. Realized investment gains losses in related trading company Realized gain (loss) on investment Trading Profit Loss [Abstract] Trading profit (loss): Net investment loss. Net Investment Loss NET INVESTMENT LOSS Operating investment expense after the consideration of management fees waived. NET EXPENSES NET EXPENSES This represents the company's cost incurred during an accounting period for managing the money in a fund, which will be billed back to the client and is a component of noninterest expenses. Mangement fee waived Percent of net assets at close of period related to fair value. Fair value Percentage of Partners' Capital Fair value Percentage of Partners' Capital (in hundredths) Percent of net assets at close of period related to unrealized currency gain (loss). Unrealized Currency Gain Percentage of Partners' Capital Unrealized Currency Gain/(Loss) Percentage of Partners' Capital (in hundredths) Morgan Stanley Smith Barney Spectrum Select L.P. Morgan Stanley Smith Barney Spectrum Select L.P. [Member] A written contract. Contracts Written [Member] A contract sold. Contracts Sold [Member] A purchased contract. Contracts Purchased [Member] Forward contracts are negotiated between two parties to purchase and sell a specific quantity of a financial instrument, foreign currency, or commodity at a price specified at origination of the contract, with delivery and settlement at a specified future date. Future contracts are forward-based contracts to make or take delivery of a specified financial instrument, foreign currency, or commodity at a specified future date or during a specified period at as specified price or yield. Futures And Forward Contracts [Member] Premiums received for writing options. Options written, premiums received Premiums paid from purchasing options. Options Purchased Premiums Paid Options purchased, premiums paid Cost of affiliated investments. Investments owned cost Investments, cost Net Asset Value allocated to each unit. Net Asset Value Per Unit NET ASSET VALUE PER UNIT (in dollars per unit) The accrued amount payable to managing member or general partner for incentive rights held. Accrued incentive fee Amounts payable to managing member or general partner for management of the day-to-day business functions of the LLC or LP. Accrued Management Fees Accrued management fees Total Trading Equity. Trading Equity Total Trading Equity Total net unrealized gain (loss) on open contracts Unrealized gain (loss) on open contracts Total net unrealized gain on open contracts Net unrealized gain on open contracts (MSIP) Net unrealized gain on open contracts MSIP Net unrealized gain (loss) on open contracts (MSIP) Net unrealized gain (loss) on open contracts (MS and Co.) Net Unrealized Gain On Open Contracts MS Co Net unrealized gain on open contracts (MS&Co.) Total unrestricted and unrestricted cash balance as of the balance sheet date. Total Cash Total cash Trading Equity [Abstract] Trading Equity: Investment in Blackwater Investment Fund. Blackwater Investment Fund [Member] Investment in MB Master Fund. MB Master Fund [Member] Investment in PGR Master Fund. PGR Master Fund [Member] Investment in BHM I, LLC. BHM I, LLC [Member] Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] Morgan Stanley Smith Barney Spectrum Technical L.P. Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] Morgan Stanley Smith Barney Spectrum Strategic L.P. Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] Morgan Stanley Smith Barney Spectrum Global Balanced L.P. Morgan Stanley Smith Barney Spectrum Global Balanced L.P. [Member]