Administrative fees Payable. Administrative Fees Payable Accrued administrative fees Amendment Flag Amendment Flag Assets Total assets Assets [Abstract] Assets: Average number of contracts outstanding. Average Number Of Contracts Outstanding Average Number Of Contracts Outstanding Capital Unit Class A [Member] Class A [Member] Class D of capital units. Capital Unit Class D [Member] Class D [Member] Capital Unit Class [Domain] Capital Unit, Class [Domain] Capital Unit Class Z Member. Capital Unit Class Z [Member] Class Z [Member] Capital Units By Class [Axis] Capital Units by Class [Axis] Capital withdrawals. Capital Withdrawals Capital withdrawals Cash Total cash Clearing Commodity Brokers [Axis] Clearing Commodity Brokers [Axis] Clearing Commodity Brokers [Axis] Clearing Commodity Brokers [Domain] Clearing Commodity Brokers [Domain] Clearing Commodity Brokers [Domain] Commodity [Member] Commodity [Member] Condensed Financial Statements Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Costs And Expenses [Abstract] Expenses: Current Fiscal Year End Date Current Fiscal Year End Date Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Derivative Assets Assets Derivative Assets Liabilities At Fair Value Net Net fair value Derivative Contract Type [Domain] Derivative Contract Type [Domain] Derivative Instrument Risk [Axis] Derivative Instrument Risk [Axis] Derivative Instruments And Hedging Activities Disclosure [Text Block] Financial Instrument Risks: Derivative Liabilities Liabilities Disclosure - Changes in Net Asset Value Per Unit for Each Class [Abstract] Disclosure Changes In Net Asset Value Per Unit For Each Class [Abstract] Disclosure - Changes in Net Asset Value Per Unit for Each Class [Abstract] Disclosure - Condensed Schedule of Investments [Abstract] Disclosure Condensed Schedule Of Investments [Abstract] Disclosure - Condensed Schedule of Investments [Abstract] Disclosure - Financial Instrument Risks - Additional Information [Abstract] Disclosure Financial Instrument Risks Additional Information [Abstract] Disclosure - Financial Instrument Risks - Additional Information [Abstract] Disclosure - Gains and Losses, by Market Sector, on Derivative Instruments [Abstract] Disclosure Gains And Losses By Market Sector On Derivative Instruments [Abstract] Disclosure - Gains and Losses, by Market Sector, on Derivative Instruments [Abstract] Disclosure General Additional Information [Abstract] Disclosure General Additional Information [Abstract] Disclosure General Additional Information [Abstract] Disclosure - Gross Fair Values of Derivative Instruments of Futures, Forward and Options Contracts [Abstract] Disclosure Gross Fair Values Of Derivative Instruments Of Futures Forward And Options Contracts [Abstract] Disclosure - Gross Fair Values of Derivative Instruments of Futures, Forward and Options Contracts [Abstract] Disclosure - Master's Fair Value Measurements [Abstract] Disclosure Masters Fair Value Measurements [Abstract] Disclosure - Master's Fair Value Measurements [Abstract] Disclosure - Organizational Costs - Additional Information [Abstract] Disclosure Organizational Costs Additional Information [Abstract] Disclosure - Organizational Costs - Additional Information [Abstract] Disclosure - Partnership's Fair Value Measurements [Abstract] Disclosure Partnerships Fair Value Measurements [Abstract] Disclosure - Partnership's Fair Value Measurements [Abstract] Disclosure - Percentage of Changes in Net Asset Value Per Unit for Each Class [Abstract] Disclosure Percentage Of Changes In Net Asset Value Per Unit For Each Class [Abstract] Disclosure - Percentage of Changes in Net Asset Value Per Unit for Each Class [Abstract] Disclosure - Statements of Financial Condition [Abstract] Disclosure Statements Of Financial Condition [Abstract] Disclosure - Statements of Financial Condition [Abstract] Disclosure - Statements of Income and Expenses and Changes in Partners Capital [Abstract] Disclosure Statements Of Income And Expenses And Changes In Partners Capital [Abstract] Disclosure - Statements of Income and Expenses and Changes in Partners Capital [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Documentand Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Fiscal Year Focus Document Fiscal Year Focus Document Information [Table] Document Information [Table] Document Period End Date Document Period End Date Document Type Document Type Earnings Per Share [Abstract] Net income (loss) per unit Earnings Per Share Policy [Text Block] Net Income (Loss) per Redeemable Unit Entity Central Index Key Entity Central Index Key Entity [Domain] Entity [Domain] Entity Filer Category Entity Filer Category Entity Information [Line Items] Entity Information [Line Items] Entity Registrant Name Entity Registrant Name Equity in trading account. Equity In Trading Account [Abstract] Equity in trading account: Equity [Member] Equity [Member] Expense reimbursements. Expense Reimbursements Expense reimbursements Fair Value By Fair Value Hierarchy Level [Axis] Fair Value, Hierarchy [Axis] Fair Value Disclosures [Text Block] Fair Value Measurements Fair Value Inputs Level 1 [Member] Level 1 [Member] Fair Value Inputs Level 2 [Member] Level 2 [Member] Fair Value Inputs Level 3 [Member] Level 3 [Member] Fair Value Investments Entities That Calculate Net Asset Value Per Share Table [Text Block] Percentage of Changes in Net Asset Value Per Unit for Each Class Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Financial highlights. Financial Highlights [Text Block] Financial Highlights Financial instruments maturity period. Financial Instruments Maturity Period Maturity period of financial instruments Floor Brokerage Exchange And Clearance Fees Brokerage, clearing and transaction fees Foreign currency. Foreign Currency [Member] Foreign currency [Member] Foreign Currency Transaction Gain Loss Unrealized Unrealized currency loss Foreign Currency Transactions And Translations Policy [Text Block] Forward Foreign Currency Contracts Foreign Exchange Contract [Member] Foreign currency [Member] Forward and future contracts. Forward And Future Contracts [Member] Forward And Future Contracts [Member] Forward Contracts [Member] Forwards [Member] Future [Member] Futures [Member] Futures contracts. Futures Contracts Policy [Text Block] Futures Contracts Futures contracts purchased. Futures Contracts Purchased [Member] Futures and Forward Contracts Purchased [Member] Futures contracts sold. Futures Contracts Sold [Member] Futures and Forward Contracts Sold [Member] General And Administrative Expense Administrative fees Administrative fees General Partner [Member] General Partner [Member] General Partners Capital Account General Partner General Partners Capital Account Units Outstanding General Partner, unit outstanding Incentive Distribution Made To Managing Member Or General Partner [Axis] Managing Member or General Partner [Axis] Incentive Distribution Recipient [Domain] Incentive Distribution, Recipient [Domain] Incentive fees. Incentive Fees Incentive fees Income Loss Attributable To Parent Net income (loss) Net income (loss) Net income (loss) allocation from Trading Company Income Loss Attributable To Parent [Abstract] Net income (loss) allocation from Trading Company Income Statement [Abstract] Income Statement [Abstract] Income Tax Policy [Text Block] Income Taxes Interest Payable Current And Noncurrent Interest payable (MSSB) Interest Rate Contract [Member] Interest rate [Member] Interest rate. Interest Rate [Member] Interest Rate [Member] Investment Holdings Schedule Of Investments Table [Text Block] Condensed Schedule of Investments Investment Income Interest Interest income Interest income allocated from Trading Company Investment Income Investment Expense Net expenses Investment Income Net Net investment income (loss) Investment Income Net [Abstract] Investment Income: Investment in master fair value disclosure. Investment In Master Fair Value Disclosure Investment in Trading Company Investment Owned At Fair Value Fair Value Investment in Trading Company, at fair value Investment Owned Percent Of Net Assets % of Partners Capital Investment Sector [Axis] Investment Sector [Axis] Investment Sector [Domain] Investment Sector [Domain] Investment Type [Axis] Investment Type [Axis] Investment Type Categorization [Member] Investment Type Categorization [Domain] Legal Entity [Axis] Legal Entity [Axis] Liabilities Total liabilities Liabilities [Abstract] Liabilities: Liabilities And Stockholders Equity Total liabilities and Partners' Capital Total liabilities and members' capital Liabilities And Stockholders Equity [Abstract] Liabilities and Members' Capital: Limited Partner [Member] Limited Partners [Member] Limited Partners Capital Account Limited Partners Limited Partners Capital Account Units Outstanding Limited Partner, units outstanding Long unrealized gain on open contracts. Long Unrealized Gain On Open Contracts Long Unrealized Gain Long unrealized loss on open contracts. Long Unrealized Loss On Open Contracts Long Unrealized Loss Major Types Of Debt And Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types Of Debt And Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Management Fee Payable Accrued management fees Management fees. Management Fees Management Fees Managing member. Managing [Member] Managing [Member] Members Equity Total members' capital Morgan stanley and company LLC. Morgan Stanley And Company Llc [Member] MS&Co. [Member] Morgan stanley company international plc . Morgan Stanley Company International Plc [Member] MSIP [Member] Net asset value per redeemable unit. Net Asset Value Per Redeemable Unit Net asset value per unit Net asset value per units Net asset value per redeemable unit. Net Asset Value Per Redeemable Unit [Abstract] Net asset value per unit Net asset value per unit: Net asset value per unit, beginning of period. Net Asset Value Per Unit Beginning Of Period Net asset value per Unit, beginning of period Net asset value per unit, end of period. Net Asset Value Per Unit End Of Period Net asset value per Unit, end of period Net asset value per unit increase decrease. Net Asset Value Per Unit Increase Decrease Increase (decrease) for the period Net gains (losses) on trading of commodity interests. Net Gains Losses On Trading Of Commodity Interests [Abstract] Trading profit (loss): Net Income Loss Net income (loss) Net income loss allocated to non managing partners. Net Income Loss Allocated To Non Managing Partners Net income (loss) allocation Net Income Loss Per Outstanding Limited Partnership And General Partnership Unit Basic And Diluted Net income (loss) per unit Net investment income loss. Net Investment Income Loss Net investment income (loss) Net investment income loss per unit. Net Investment Income Loss Per Unit Net investment income (loss) Net realized and unrealized gains loss per unit. Net Realized And Unrealized Gains Loss Per Unit Net realized and unrealized gains (losses) Net realized gains losses on closed contracts allocated from trading company. Net Realized Gains Losses On Closed Contracts Allocated From Trading Company Net realized gains (losses) on closed contracts allocated from Trading Company Net unrealized appreciation on open forward contracts. Net Unrealized Appreciation On Open Forward Contracts Net unrealized gain (loss) on open contracts (MSIP) Net unrealized appreciation on open futures contracts. Net Unrealized Appreciation On Open Futures Contracts Net unrealized gain (loss) on open contracts (MS&Co.) Net unrealized gain loss on open contracts. Net Unrealized Gain Loss On Open Contracts Total net unrealized gain (loss) on open contracts New Accounting Pronouncements Policy Policy [Text Block] Recent Accounting Pronouncements Non managing member. Non Managing [Member] Non-Managing [Member] Non managing members capital. Non Managing Members Capital Non-Managing Members Ongoing placement agent fees. Ongoing Placement Agent Fees Ongoing placement agent fees Open Option Contracts Written At Fair Value Options written (premiums received $16,245,918 and $11,823,204, respectively) Options written on Futures Contracts Options written Open option contracts written at fair value average number of contracts. Open Option Contracts Written At Fair Value Average Number Of Contracts Average number of contracts outstanding for the year, Options written Operating Costs And Expenses [Abstract] Expenses: Operating Expenses Total expenses Total expenses Options contracts. Options Contracts [Member] Options Contracts [Member] Options. Options Policy [Text Block] Options Options Premium Received At Fair Value Options Premium Received At Fair Value Premiums received Options written. Options Written [Member] Options Written [Member] Organizational costs paid by broker. Organizational Costs Paid By Broker Organizational costs Organizational costs repayment period. Organizational Costs Repayment Period Cost reimbursed by the partnership Organizational costs. Organizational Costs [Text Block] Organizational Costs Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] General: Other Expenses Other Parent Company [Member] BHM I, LLC [Member] Partners Capital Partners Capital Ending Partners Capital Beginning Total Partners' Capital Partners Capital [Abstract] Members' Capital: Partners' Capital: Partners Capital Account Contributions Capital contributions Partners Capital Account Subscriptions Partners Capital Account Redemptions Partners Capital Account Redemptions Partners Capital Account Units Partners Capital Account Units, Ending Partners Capital Account Units, Beginning Partners Capital Account Units Contributed Partners Capital Account Subscriptions, units Partners Capital Account Units Redeemed Partners Capital Account Units Redeemed Partnership's and the master's fair value measurements. Partnerships And Masters Fair Value Measurements Policy [Text Block] Partnership's and the Trading Company's Fair Value Measurements. Partnership's investments. Partnerships Investments Policy [Text Block] Partnership's Investments Partner Type Of Partners Capital Account [Axis] Partner Type [Axis] Partner Type Of Partners Capital Account Name [Domain] Partner Type of Partners' Capital Account, Name [Domain] Payables To Customers Redemptions payable Percentage of options purchased on futures contracts. Percentage Of Options Purchased On Futures Contracts Percentage of options purchased on futures contracts Percentage of partnership owned. Percentage Of Partnership Owned Percentage of partnership owned Percentage of unrealized currency loss. Percentage Of Unrealized Currency Loss Percentage of unrealized currency loss Percentage options written on futures contracts. Percentage Options Written On Futures Contracts Percentage of options written on futures contracts Premium Paid Premium Paid Premiums paid Principal Transactions Revenue Total trading results Principal Transactions Revenue [Abstract] Trading results Ratio of expenses after incentive fees to average members capital. Ratio Of Expenses After Incentive Fees To Average Members Capital Expenses after incentive fees(2) Ratio of expenses before incentive fees to average members capital. Ratio Of Expenses Before Incentive Fees To Average Members Capital Expenses before incentive fees(2) Ratio of expenses to average net assets. Ratio Of Expenses To Average Net Assets Total expenses Ratio of incentive fee allocated to average net assets. Ratio Of Incentive Fee Allocated To Average Net Assets Incentive fees allocated from the Trading company Ratio of incentive fees to average net assets. Ratio Of Incentive Fees To Average Net Assets Incentive fees Ratio of net income or loss including incentive fee allocated to average net assets. Ratio Of Net Income Or Loss Including Incentive Fee Allocated To Average Net Assets Net investment income (loss) Ratio of net income or loss to average members capital. Ratio Of Net Income Or Loss To Average Members Capital Net income (loss) Ratio of net investment income loss to average net assets. Ratio Of Net Investment Income Loss To Average Net Assets Net investment income (loss) before incentive fees ****** Ratio of net investment loss to average members capital. Ratio Of Net Investment Loss To Average Members Capital Net investment loss(2) Ratio of operating expenses to average net assets. Ratio Of Operating Expenses To Average Net Assets Operating expense Ratio of return after incentive fees to average members capital. Ratio Of Return After Incentive Fees To Average Members Capital Total return after incentive fees Ratio of return after incentive fees to average net assets. Ratio Of Return After Incentive Fees To Average Net Assets Total return after incentive fees Ratio of return before incentive fees to average members capital. Ratio Of Return Before Incentive Fees To Average Members Capital Total return before incentive fees Ratio of return before incentive fees to average net assets. Ratio Of Return Before Incentive Fees To Average Net Assets Total return before incentive fees Ratio of return incentive fees to average net assets. Ratio Of Return Incentive Fees To Average Net Assets Incentive fees Ratio to average members capital. Ratio To Average Members Capital [Abstract] Ratios to average Members' Capital: (1) Ratio to average net assets. Ratio To Average Net Assets [Abstract] Ratios to average net assets: Realized Investment Gains Losses Realized Redemption/subscription value per Unit, end of period. Redemption And Subscription Value Per Unit End Of Period Redemption/subscription value per Unit, end of period Reimbursement Revenue Expense reimbursements Restricted Cash And Cash Equivalents Restricted cash Total return. Returns [Abstract] Total return: Schedule Of Condensed Financial Statements [Table] Schedule of Condensed Financial Statements [Table] Schedule Of Condensed Financial Statements Table [Text Block] Statements of Financial Condition Schedule Of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis Table [Text Block] Master's Fair Value Measurements Schedule of income and expenses and changes in partners' capital. Schedule Of Income And Expenses And Changes In Partners Capital Table [Text Block] Statements of Income and Expenses and Changes in Partners Capital