Amendment Flag Current Fiscal Year End Date Document Period End Date 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 Document Type Investment Contract Counterparty [Axis] Investment Contract Counterparty [Domain] Summary of Significant Accounting Policies [Abstract] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Assets Assets [Abstract] Total assets Capital units, outstanding (in units) Class 0 Units [Member] Capital Unit, Class A [Member] Capital Units by Class [Axis] Capital Unit [Line Items] Class 2 Units [Member] Capital Unit, Class B [Member] Capital Unit, Class [Domain] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash and Cash Equivalents, at Carrying Value Net change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash flows provided by (used in) operating activities Ownership percentage (in hundredths) Equity Method Investee, Name [Domain] Fair Value Net gain (loss) allocated from investments in other funds: Statements of Operations (Unaudited) [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income Taxes [Abstract] Net loss Net loss Net loss Income (Loss) Attributable to Parent Increase (Decrease) in Partners' Capital [Roll Forward] Interest and other Interest income Interest Income, Operating Net investment loss allocated from investments in other funds: Investment income: Investment, at fair value Investment Owned, at Fair Value Liabilities: Total liabilities Liabilities Liabilities and members' capital Total liabilities and members' capital Liabilities and Equity Maximum [Member] Minimum [Member] Net gain (loss) allocated from investments in other funds Net Realized and Unrealized Gain (Loss) on Trading Securities Cash flows (used in) provided by financing activities Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities Incentive allocation Expenses: Total expenses Operating Expenses Organization and Business [Abstract] Organization and Business Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Redemptions Partners' Capital Account, Redemptions Members' capital Members' capital Members' capital Members' capital: Members' capital (in units) Members' capital (in units) Partners' Capital Account, Units Capital Accounts [Abstract] Redemptions (in units) Partners' Capital Account, Units, Redeemed Capital Accounts Partners' Capital Notes Disclosure [Text Block] Proceeds from sale of investments Range [Axis] Range [Domain] Related Party Transaction [Line Items] Fees and Related Party Transactions [Abstract] Schedule of Capital Units [Table] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Line Items] Equity Method Investee, Name [Axis] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Sponsor fees Statement [Table] Statement [Line Items] Statements of Changes in Members' Capital (Unaudited) [Abstract] Statements of Cash Flows (Unaudited) [Abstract] Statements of Financial Condition (Unaudited) [Abstract] Subsequent Events Subsequent Events [Text Block] Subsequent Events [Abstract] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Event Type [Axis] Subsequent Event [Table] Subsequent Event [Member] Net realized gain (loss) on investments Trading Securities, Realized Gain (Loss) Net decrease in unrealized appreciation on investments Trading Securities, Change in Unrealized Holding Gain (Loss) Represents funds which invest in various master trading vehicles "Master funds". Graham Alternative Investment Trading LLC [Member] Represents funds which invest in various master trading vehicles "Master funds". Graham Alternative Investment Trading II LLC [Member] Represents the types of portfolios the entity maintains. Type of Portfolio [Axis] Name of the entities' portfolios. Portfolio, Name [Domain] Represents strategy that offers a combination of index and actively managed investments in one portfolio. Blended Strategies Portfolio [Member] Represents strategy that offers a systematic way of investing funds to enhance returns on investment made. Systematic Strategies Portfolio [Member] Amounts expected to be received for redemptions from investments at the end of the reporting period. Redemption receivable Redemption receivable Amounts due for shareholder redemptions at the end of the reporting period. Accrued redemptions Number of capital units issued. Units issued Capital units, issued (in units) The stated value of each capital unit per unit. Capital units, stated value Capital units, value (in dollars per unit) Fees paid on services for investment advice, research and other services. Such services may include the investment management of mutual funds and separate accounts, and are generally based upon the size of the funds managed. InvestmentAdvisoryFee Brokerage fees Investment income (loss) net of operating and interest expense. Net Investment Loss Net investment loss allocated from investments in other funds Total change in each class of partners' capital accounts during the year due to subscriptions. All partners include general, limited and preferred partners. Partners Capital Account Subscriptions Subscriptions The number of units subscribed during the year of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners. Partners Capital Account Subscribed Subscriptions (in units) Investments made in other funds. Investments made in other funds Investments The cash inflow from unit subscription activity during the reporting period. Proceeds From Subscriptions Subscriptions The cash outflow from unit redemption activity during the reporting period. Payments Of Redemptions Redemptions The entire disclosure for asset management fees and related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates. Examples of asset management fees include revenue recognized in the period for (1) performance (incentive) fees based on the investment results achieved for management of certain institutional accounts and hedge funds, (2) schedule-based fees earned for management of mutual funds and closed-end funds, based either on average daily net assets or on a combination of the average daily net assets and gross income, and (3) other investment management and advisory fees. Management Fee and Related Party Transactions Disclosure [Text Block] Fees and Related Party Transactions Financial Highlights [Abstract] The entire disclosure for entities' financial highlights. Financial Highlights [Text Block] Financial Highlights Disclosure of accounting policy for indemnifications. Indemnifications, Policy [Policy Text Block] Indemnifications GAIT Funds. GAIT Funds [Member] Graham Alternative Investment Fund LLC [Member] GAIT II Funds. GAIT II Funds [Member] Graham Alternative Investment Trading II LLC [Member] Minimum amount required by the investors to invest in each class of capital units or shares. Capital Units, minimium initial subscription amount Minimum initial subscription amount Capital units, minimum cost for additional units. Capital units, minimum cost for additional units Minimum cost for additional units Represents minimum notice period for units available for subscription. Minimum Notice Period For Units Subscription Minimum notice period for units subscription Represents minimum notice period for units available for redemption. Minimum Notice Period For Units Redemption Minimum notice period for units redemption Represent minimum amount for partial redemption request. Minimum Amount For Partial Redemption Request Minimum amount for partial redemption request Represents minimum holding that an investor must have after partial redemption. Minimum Holding Post Partial Redemption Minimum holding post partial redemption Represents maximum period in which proceeds from redemption will remitted. Period Of Remittance Redemption proceeds Period of remittance redemption proceeds Partners' Capital, Redemption and Conversion Policies Redemption and conversion policies Redemption and conversion policies The amount of cash paid during the periods for redemptions that occurred during a predefined time period. Fees Paid to Manager for Redemptions Fees paid to manager for redemptions The fee, expressed as a percentage of net asset value, for the redemption of a class of capital units for specific time period. Redemption fee Redemption fee (in hundredths) Description of the holding period applicable to a maximum redemption fee. Maximum applicable redemption fee holding period, description Description of the holding period applicable to a minimum redemption fee. Minimum Applicable Redemption Fee Holding Period Description Tabular disclosure of the Brokerage Fees annual rate, shown as a percentage. Schedule of Brokerage Fees [Table Text Block] Schedule of Brokerage Fees Annual percentage of the Net Asset Value per Class of the Fund paid to the advisor for management of the day-to-day business functions of the LLC or LP. Management Fee Annual advisory fee percentage (in hundredths) Annual percentage of the Net Asset Value per Class of the Fund paid to the Manager for providing certain management support and administrative oversight services including the organization and sale of stock, investment funds, limited partnerships and mutual funds. Sponsors Fees Annual sponsor fee percentage (in hundredths) Percentage of the New High Net Trading Profits of each Class of the Fund, as defined in the LLC Agreement, paid to the Manager of the Fund as a special allocation of net profits. Incentive allocation percentage (in hundredths) Brokerage Fees [Abstract] Brokerage fees [Abstract] Annual percentage of the Net Asset Value per Class of the Fund paid to the Manager as a brokerage fee for providing investment advice, research and other services. Annual brokerage fee percentage (in hundredths) Tabular disclosure for entities' financial highlights - Unit Operating Performance. Unit Operating Performance [Table Text Block] Unit Operating Performance Tabular disclosure for entities' financial highlights - Total return for the Blended Strategic Portfolio. Capital and Total Return for Blended Strategies Portfolio [Table Text Block] Capital and Total Return for Blended Strategies Portfolio Tabular disclosure for entities' financial highlights - Total return for the Systematic Strategic Portfolio. Capital and Total Return for Systematic Strategies Portfolio [Table Text Block] Capital and Total Return for Systematic Strategies Portfolio Net asset value per unit [Abstract] Net asset value per unit [Abstract] This element represents the total value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value. Net Asset Value Per Unit Beginning Of Period Net asset value per unit, beginning of period (in dollars per unit) Net Gain Loss [Abstract] Net loss: Amount of losses realized during the period from certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). Investments, Entities that Calculate Net Asset Value Per Share, Net Investment Loss Net investment loss (in dollars per unit) Investment income (loss) net of operating and interest expense. Net gain (loss) on investment Net gain (loss) on investments (in dollars per unit) Investment income (loss) net of operating and interest expense. Net Loss Net loss (in dollars per unit) This element represents the total value of investments in certain entities that calculate net asset value per share (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements, but may also be used in both the balance sheet and disclosure in the same submission. This item represents alternative investments as of the balance sheet date which may include investments in certain hedge funds, venture capital funds, private equity funds, real estate partnerships or funds, and any other investment in which investee management calculates net asset value per share as the primary metric for investment value. Net asset value per unit, end of period Net asset value per unit, end of period (in dollars per unit) Ratios to Average Members Capital And Total Return [Abstract] Ratios to average members capital and total return [Abstract] Total Return Before Incentive Allocation Entities that Calculate Net Asset Value Per Share, Total Return Before Incentive Allocation Total return before Incentive Allocation (in hundredths) Incentive Allocation Entities that Calculate Net Asset Value Per Share, Incentive Allocation Incentive Allocation (in hundredths) Total Return After Incentive Allocation. Entities that Calculate Net Asset Value Per Share, Total Return After Incentive Allocation Total return after Incentive Allocation (in hundredths) Net Investment Loss Before Incentive Allocation Entities that Calculate Net Asset Value Per Share, Net Investment Loss Before Incentive Allocation Net investment loss before Incentive Allocation (in hundredths) Incentive Allocation Entities that Calculate Net Asset Value Per Share, Net Investment Loss Incentive Allocation Incentive Allocation (in hundredths) Net Investment Loss After Incentive Allocation. Entities that Calculate Net Asset Value Per Share, Net Investment Loss After Incentive Allocation Net investment loss after Incentive Allocation (in hundredths) Total Expenses Before Incentive Allocation Entities that Calculate Net Asset Value Per Share, Total Expenses Before Incentive Allocation Total expenses before Incentive Allocation (in hundredths) Incentive allocation paid to the manager. Incentive Allocation Allocated to Expenses Incentive Allocation (in hundredths) Total Expenses After Incentive Allocation Entities that Calculate Net Asset Value Per Share, Total Expenses After Incentive Allocation Total expenses after Incentive Allocation (in hundredths) Total Return Before Commission Reimbursements Entities that Calculate Net Asset Value Per Share, Total Expenses Before Commission Reimbursements Commission reimbursements (in hundredths) The amount of subscriptions to the fund during the period from the beginning of the period to the latest practicable date. Fund Subscriptions Fund subscriptions The amount of redemptions of the fund during the period from the beginning of the period to the latest practicable date. Fund Redemptions Fund redemptions Document and Entity Information [Abstract] Amount paid to the advisor for management of the day-to-day business functions of the LLC or LP including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or General Partner, or whether the fee is waived. Advisory fees Advisory fees