Westport Futures Fund 10-Q 13 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	CK0001037189
Entity Registrant Name	WESTPORT FUTURES FUND L.P.
Entity Central Index Key	1037189
Current Fiscal Year End Date	-19
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		21,746.20

Statements_of_Financial_Condit

Statements of Financial Condition (USD $)	Mar. 31, 2015		Dec. 31, 2014
Assets:
Investment in the Master, at fair value	$26,263,127	[1]	$26,474,464	[1]
Cash	93,727		5,730
Total assets	26,356,854		26,480,194
Accrued expenses:
Ongoing selling agent fees	43,929		44,135
Management fees	43,674		43,974
Administrative fees	21,837		21,987
Other	108,748		51,692
Redemptions payable to Limited Partner	143,611		253,766
Total liabilities	361,799		415,554
Partners' Capital:
General Partner, 248.2379 Redeemable Units outstanding at March 31, 2015 and December 31, 2014, respectively	291,047		290,694
Limited Partners, 21,923.2637 and 22,009.6377 Redeemable Units outstanding at March 31, 2015 and December 31, 2014, respectively	25,704,008		25,773,946
Total partners' capital	25,995,055		26,064,640
Total liabilities and partners' capital	$26,356,854		$26,480,194
Net asset value per unit	$1,172.45		$1,171.03
[1]	Defined in Note 1.

Statements_of_Financial_Condit1

Statements of Financial Condition (Parenthetical)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
General Partner's capital, Redeemable Units outstanding	248.2379	248.2379
Limited Partner's capital, units outstanding	21,923.26	22,009.64

Statements_of_Income_and_Expen

Statements of Income and Expenses and Changes in Partners' Capital (USD $)	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Investment Income:
Interest income allocated from Master	$467		$1,641
Total investment income	467		1,641
Expenses:
Expenses allocated from Master	62,678		90,090
Ongoing selling agent fees	133,728		344,547
Management fees	133,038		130,357
Administrative fees	66,519
Other	81,244		35,557
Total expenses	477,207		600,551
Net investment income (loss)	-476,740		-598,910
Trading Results:
Net realized gains (losses) on closed contracts allocated from Master	1,014,948		833,710
Change in net unrealized gains (losses) on open contracts allocated from Master	-505,832		429,106
Total trading results allocated from Master	509,116		1,262,816
Net income (loss)	32,376		663,906
Subscriptions - Limited Partners	556,330		614,000
Redemptions - Limited Partners	-658,291		-650,194
Net increase (decrease) in Partners' Capital	-69,585		627,712
Partners' Capital, beginning of period	26,064,640		25,520,809
Partners' Capital, end of period	$25,995,055		$26,148,521
Net asset value per unit (22,171.5016 and 25,287.9576 units outstanding at March 31, 2015 and 2014, respectively)	$1,172.45		$1,034.03
Net income (loss) per unit	$1.42	[1]	$26.01	[1]
Weighted average units outstanding	22,257.90		25,498.85
[1]	Represents the change in net asset value per unit during the period.

Statements_of_Income_and_Expen1

Statements of Income and Expenses and Changes in Partners' Capital (Parenthetical)	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Partner's capital, units outstanding	22,171.50	25,287.96

Organization

Organization	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Organization	1	Organization:
	Westport Futures Fund L.P. (the “Partnership”) is a limited partnership organized on March 21, 1997 under the partnership laws of the State of New York to engage, directly and indirectly, in the speculative trading of a diversified portfolio of commodity interests, including futures, options on futures, forward, options on forward, spot and swap contracts, cash commodities and any other rights or interests pertaining thereto including interests in commodity pools. The Partnership may also engage in exchange for physical transactions. The sectors traded include U.S. and international markets for energy, currencies, interest rates, indices, agricultural products and metals. The Partnership commenced trading on August 1, 1997. The commodity interests that are traded by the Partnership, through its investment in Rabar Master Fund L.P. (“the Master”), are volatile and involve a high degree of market risk. The General Partner may also determine to invest up to all of the Partnership’s assets in United States Treasury bills. The Partnership privately and continuously offers redeemable units (“Redeemable Units”) to qualified investors. There is no maximum number of Redeemable Units that may be sold by the Partnership.
	Ceres Managed Futures LLC, a Delaware limited liability company, acts as the general partner (the “General Partner”) and commodity pool operator of the Partnership. The General Partner is wholly owned by Morgan Stanley Smith Barney Holdings LLC (“MSSB Holdings”). MSSB Holdings is ultimately owned by Morgan Stanley. Morgan Stanley is a publicly held company whose shares are listed on the New York Stock Exchange. Morgan Stanley is engaged in various financial services and other businesses. Prior to June 28, 2013, Morgan Stanley indirectly owned a majority equity interest in MSSB Holdings and Citigroup Inc. indirectly owned a minority equity interest in MSSB Holdings. Prior to July 31, 2009, the date as of which MSSB Holdings became its owner, the General Partner was wholly owned by Citigroup Financial Products Inc., a wholly owned subsidiary of Citigroup Global Markets Holdings Inc., the sole owner of which is Citigroup Inc. As of March 31, 2015, all trading decisions for the Partnership are made by Rabar Market Research Inc. (“Rabar”). Effective December 1, 2012, Rabar replaced John W. Henry and Company Inc. (“JWH”) as the Partnership’s sole trading advisor. References in this report to the “Advisor” refers to JWH and/or Rabar as applicable.
	Effective December 1, 2012, the Partnership allocated substantially all of its capital to the Master, a limited partnership organized under the partnership laws of the State of Delaware. The Partnership purchased an interest in the Master with cash equal to $31,143,887. The units of the Master are used solely for accounting purposes and do not represent units issued legally. The Master permits accounts managed now and in the future by the Advisor using the Diversified Program, a propriety, systematic trading program, to invest together in one trading vehicle. The General Partner is also the general partner of the Master. Individual and pooled accounts currently managed by the Advisor, including the Partnership, are permitted to be limited partners of the Master. The General Partner and the Advisor believe that trading through this master-feeder structure promotes efficiency and economy in the trading process. Expenses to investors as a result of the investment in the Master are approximately the same and redemption rights are not affected.
	The General Partner is not aware of any material changes to the trading program discussed above during the fiscal quarter ended March 31, 2015.
	A limited partner of the Master may withdraw all or part of its capital contributions and undistributed profits, if any, from the Master as of the end of any day (the “Redemption Date”) after a request for redemption has been made to the General Partner at least 3 days in advance of the Redemption Date. Such withdrawals are classified as a liability when the limited partner elects to redeem and informs the Master.
	As of March 31, 2015, the Partnership’s/Master’s commodity broker was Morgan Stanley & Co. LLC (“MS&Co.”), a registered futures commission merchant.
	The Master has entered into a futures brokerage account agreement and a foreign exchange brokerage account agreement with MS&Co. The Partnership has also entered into a futures brokerage account agreement with MS&Co. The Partnership, through its investment in the Master, pays MS&Co. trading fees for the clearing and, where applicable, execution of transactions.
	The Partnership has entered into a selling agreement with Morgan Stanley Smith Barney LLC (d/b/a Morgan Stanley Wealth Management). Pursuant to the selling agreement, Morgan Stanley Wealth Management receives a monthly selling agent fee equal to 2.0% per year of adjusted month-end net assets. The selling agent fee received by Morgan Stanley Wealth Management is shared with the properly registered/exempted financial advisers of Morgan Stanley Wealth Management who sell Redeemable Units in the Partnership.
	Effective April 1, 2014, the monthly ongoing selling agent fee was reduced from an annual rate of 5.25% to an annual rate of 3.0%.
	Effective October 1, 2014, the monthly ongoing selling agent fee was further reduced from an annual rate of 3.0% to its current annual rate of 2.0%. As of the same date, the Partnership began paying an administrative fee to the General Partner at an annual rate of 1.0%. The October 1, 2014 fee changes offset each other and, accordingly, there was no change to the aggregate fees incurred by the Partnership.

Basis_of_Presentation_and_Summ

Basis of Presentation and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	2	Basis of Presentation and Summary of Significant Accounting Policies
	The accompanying financial statements and accompanying notes are unaudited but, in the opinion of the General Partner, include all adjustments, consisting only of normal recurring adjustments, necessary for a fair presentation of the Partnership’s financial condition at March 31, 2015 and December 31, 2014, and the results of its operations and changes in partners’ capital for the three months ended March 31, 2015, and 2014. These financial statements present the results of interim periods and do not include all disclosures normally provided in annual financial statements. These financial statements should be read together with the financial statements and notes included in the Partnership’s Annual Report on Form 10-K (the “Form 10-K”) filed with the Securities and Exchange Commission (the “SEC”) for the year ended December 31, 2014. The December 31, 2014 information has been derived from the audited financial statements as of and for the year ended December 31, 2014.
	The preparation of financial statements and accompanying notes in conformity with accounting principles generally accepted in the United States of America (“GAAP”) requires the General Partner to make estimates and assumptions that affect the reported amounts of assets and liabilities, income and expenses, and related disclosures of contingent assets and liabilities in the financial statements and accompanying notes. As a result, actual results could differ from these estimates.
	The clearing fees and other expenses allocated from the Master which were previously disclosed separately on the Statements of Income and Expenses, are now disclosed in aggregate as expenses allocated from the Master.
	As of March 31, 2015, and December 31, 2014, the Partnership owned 100% of the Master. The Partnership intends to continue to invest all of its assets in the Master. The performance of the Partnership is directly affected by the performance of the Master. The Master’s trading of futures, forward, swaps and option contracts, if applicable, on commodities is done primarily on U.S. commodity exchanges and foreign commodity exchanges. The Master engages in such trading through commodity brokerage accounts maintained by MS&Co. The Master’s Statements of Financial Condition, including Condensed Schedules of Investments and Statements of Income and Expenses and Changes in Partners’ Capital, are included herein.
	The General Partner and each limited partner of the Partnership share in the profits and losses of the Partnership in proportion to the amount of Partnership interest owned by each, except that no limited partner is liable for obligations of the Partnership in excess of its capital contributions and profits, if any, net of distributions or redemptions and losses, if any.
	Due to the nature of commodity trading, the results of operations for the interim periods presented should not be considered indicative of the results that may be expected for the entire year.
	Partnership’s Investment: The Partnership carries its investment in the Master at fair value based on the Master’s net asset value per unit as calculated by the Master. The valuation of the Master’s investments including the classification within the fair value hierarchy of the investments held by the Master are described in Note 5, “Fair Value Measurements.”
	Master’s Investments: Fair value of exchange-traded futures, options and forward contracts is determined by the various futures exchanges, and reflects the settlement price for each contract as of the close of business on the last business day of the reporting period. The fair value of foreign currency forward contracts is extrapolated on a forward basis from the spot prices quoted as of approximately 3:00 P.M. (E.T.) on the last business day of the reporting period from various exchanges. The fair value of non-exchange- traded foreign currency option contracts is calculated by applying an industry standard model application for options valuation of foreign currency options, using as inputs the spot prices, interest rates, and option implied volatilities quoted as of approximately 3:00 P.M. (E.T.) on the last business day of the reporting period.
	All commodity interests of the Master (including derivative financial instruments and derivative commodity instruments) are held for trading purposes. The commodity interests are recorded on the trade date and open contracts are recorded at fair value at the measurement date. Investments in commodity interests denominated in foreign currencies are translated into U.S. dollars at the exchange rates prevailing at the measurement date. Gains or losses are realized when contracts are liquidated. Unrealized gains or losses on open contracts are included as a component of equity in trading account on the Master’s Statements of Financial Condition. Net realized gains or losses and any change in net unrealized gains or losses from the preceding period are reported on the Master’s Statements of Income and Expenses and Changes in Partners’ Capital.
	Investment Company Status: The Partnership adopted Accounting Standard Update (“ASU”) 2013-08, “Financial Services — Investment Companies (Topic 946): Amendments to the Scope, Measurement and Disclosure Requirements.” and based on the General Partner’s assessment, the Partnership has been deemed to be an investment company since inception.
	Income Taxes: Income taxes have not been provided as each partner is individually liable for the taxes, if any, on its share of the Partnership’s income and expenses. GAAP provides guidance for how uncertain tax positions should be recognized, measured, presented and disclosed in the financial statements and requires the evaluation of tax positions taken or expected to be taken in the course of preparing the Partnership’s financial statements to determine whether the tax positions are “more- likely-than-not” to be sustained by the applicable tax authority. Tax positions with respect to tax at the Partnership level not deemed to meet the “more-likely-than-not” threshold would be recorded as a tax benefit or expense in the current year. The General Partner concluded that no provision for income tax is required in the Partnership’s financial statements.
	The Partnership files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The 2011 through 2014 tax years remain subject to examination by U.S. federal and most state tax authorities. The General Partner does not believe that there are any uncertain tax positions that require recognition of a tax liability.
	Recent Accounting Pronouncement. In May 2015, the Financial Accounting Standards Board (“FASB”) issued ASU 2015-07 “Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” which relates to disclosures for investments that calculate net asset value per share (potentially funds of fund structures). The ASU requires investments for which the practical expedient is used to measure fair value at Net Asset Value (“NAV”) be removed from the fair value hierarchy. Instead, an entity is required to include those investments as a reconciling line item so that the total fair value amount of investments in the disclosure is consistent with the amount on the balance sheet. Further, the ASU requires entities to provide the disclosures in Accounting Standards Codification (“ASC”) 820-10-50-6A only for investments for which they elect to use the NAV practical expedient to determine fair Value. The standard is effective for public business entities for fiscal years beginning after December 15, 2015, early adoption is permitted. The General Partner is currently evaluating the impact that the new pronouncement would have on the Partnership’s financial statements.
	Net Income (Loss) Per Unit. Net income (loss) per unit is calculated in accordance with investment company guidance. See Note 3, “Financial Highlights.”
	There have been no material changes with respect to the Partnership’s critical accounting policies as reported in the Partnership’s Annual Report on Form 10-K for the year ended December 31, 2014.

Financial_Highlights

Financial Highlights	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Financial Highlights	3	Financial Highlights:
	Financial highlights for the limited partner class as a whole for the three months ended March 31, 2015 and 2014 were as follows:
			Three Months Ended
			March 31,
			2015			2014
	Net realized and unrealized gains (losses)		$	22.84		$	49.5
	Interest income			0.03			0.06
	Expenses			(21.45	)		(23.55	)
	Increase (decrease) for the year			1.42			26.01
	Net asset value per unit, beginning of period			1,171.03			1,008.02
	Net asset value per unit, end of period		$	1,172.45		$	1,034.03
	Certain prior period adjustments have been reclassified to conform to current presentation. In the financial highlights, the ongoing selling agent fees and clearing fees allocated from the Master which were previously included in net realized and unrealized gains (losses) per unit and excluded from expenses per unit, are now excluded from net realized gains (losses) per unit and included in expenses per unit. This information was previously included as a footnote to the financial highlights table.
			Three Months Ended
			March 31,
			2015			2014
	Ratios to average net assets:*
	Net investment income (loss)**			(7.4	)%		(9.4	)%
	Operating expense			7.4	%		9.5	%
	Incentive fees			—	%		—	%
	Total expenses			7.4	%		9.5	%
	Total return:
	Total return before incentive fees			0.1	%		2.6	%
	Incentive fees			—	%		—	%
	Total return after incentive fees			0.1	%		2.6	%
	*	Annualized (other than incentive fees).
	**	Interest income allocated from the Master less total expenses. Does not reflect the effects of incentive fees.
	The above ratios and total return may vary for individual investors based on the timing of capital transactions during the period. Additionally, these ratios are calculated for the limited partner class using the limited partners’ share of income, expenses and average net assets of the Partnership and includes the income and expenses allocated from the Master.

Trading_Activities

Trading Activities	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Trading Activities	4	Trading Activities:
	The Partnership was formed for the purpose of trading contracts in a variety of commodity interests, including derivative financial instruments and derivative commodity instruments. The Partnership invests substantially all of its assets through a “master/feeder” structure. The results of the Partnership’s pro rata share of the results of the Master’s trading activities are shown on the Statements of Income and Expenses and Changes in Partners’ Capital.
	The customer agreement with the Partnership, the Master and MS&Co. gives each of the Partnership and the Master, the legal right to net unrealized gains and losses on open futures and open forward contracts. The Partnership and the Master net, for financial reporting purposes, the unrealized gains and losses on open futures and on open forward contracts on the Statements of Financial Condition as the criteria under Accounting Standards Codification 210-20, “Balance Sheet” have been met.
	Ongoing selling agent fees paid to Morgan Stanley Wealth Management are calculated as a percentage of the Partnership’s adjusted net asset value on the last day of each month and are affected by trading performance, subscriptions and redemptions.
	Trading and transaction fees are based on the number of trades executed by the Advisor. All trading, exchange, clearing, user, give-up, floor brokerage and National Futures Association fees (collectively, the “clearing fees”) paid to MS&Co. are borne by the Master and allocated to the Partnership.
	All of the commodity interests owned by the Master are held for trading purposes. The monthly average number of futures contracts traded by the Master during the three months ended March 31, 2015 and 2014 were 1,461 and 2,204, respectively. The monthly average number of metal forward contracts traded by the Master during the three months ended March 31, 2015 and 2014 were 103 and 170, respectively. The monthly average notional values of currency forward contracts held by the Master during the three months ended March 31, 2015 and 2014 were $16,578,769 and $10,292,148, respectively.

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	5	Fair Value Measurements:
	Master’s Fair Value Measurements. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date under current market conditions. The fair value hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to fair values derived from unobservable inputs (Level 3). The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest level input that is significant to the fair value measurement in its entirety.
	The Master considers prices for exchange-traded commodity futures and forward contracts to be based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1). The values of non-exchange-traded forward contracts for which market quotations are not readily available are priced by broker-dealers that derive fair values for those assets and liabilities from observable inputs (Level 2). As of and for the periods ended March 31, 2015, and December 31, 2014, the Master did not hold any derivative instruments that were priced at fair value using unobservable inputs through the application of the General Partner’s assumptions and internal valuation pricing models (Level 3). Transfers between levels are recognized at the end of the reporting period. During the three months ended March 31, 2015 and for the year ended December 31, 2014, there were no transfers of assets or liabilities between Level 1 and Level 2.
	March 31, 2015		Total			Level 1			Level 2			Level 3
	Assets
	Futures		$	736,774		$	736,774		$	—		$	—
	Forwards			69,868			42,192			27,676			—
	Total assets		$	806,642		$	778,966		$	27,676		$	—
	Liabilities
	Futures		$	234,455		$	234,455		$	—		$	—
	Forwards			213,757			106,731			107,026			—
	Total liabilities			448,212			341,186			107,026			—
	Net fair value		$	358,430		$	437,780		$	(79,350	)	$	—
	December 31, 2014		Total			Level 1			Level 2			Level 3
	Assets
	Futures		$	953,167		$	953,167		$	—		$	—
	Forwards			188,070			82,420			105,650			—
	Total assets		$	1,141,237		$	1,035,587		$	105,650		$	—
	Liabilities
	Futures		$	170,551		$	170,551		$	—		$	—
	Forwards			106,425			51,986			54,439			—
	Total liabilities			276,976			222,537			54,439			—
	Net fair value		$	864,261		$	813,050		$	51,211		$	—
	The Master’s Statements of Financial Condition and Condensed Schedules of Investments as of March 31, 2015 and December 31, 2014 and Statements of Income and Expenses and Changes in Partners’ Capital for the three months ended March 31, 2015 and 2014, are presented below:
	Rabar Master Fund L. P.
	Statements of Financial Condition
			(Unaudited)			December 31,
			March 31,			2014
			2015
	Assets:
	Equity in trading account:
	Cash		$	22,714,200		$	23,468,773
	Cash margin			3,257,982			2,188,244
	Net unrealized appreciation on open futures contracts			502,319			782,616
	Net unrealized appreciation on open forward contracts			—			81,645
	Total assets		$	26,474,501		$	26,521,278
	Liabilities and Partners’ Capital:
	Liabilities:
	Net unrealized depreciation on open forward contracts		$	143,889		$	—
	Accrued expenses:
	Professional fees			67,628			45,098
	Clearing fees due to MS&Co.			—			1,842
	Total liabilities			211,517			46,940
	Partners’ Capital:
	General Partner			—			—
	Limited Partner			26,262,984			26,474,338
	Total liabilities and Partners’ Capital		$	26,474,501		$	26,521,278
	Rabar Master Fund L.P.
	Condensed Schedule of Investments
	31-Mar-15
	(Unaudited)
			Notional ($)/			Fair Value			% of Partners’
			Number of						Capital
			Contracts
	Futures Contracts Purchased
	Currencies			7		$	(1,658	)		(0.01	)%
	Grains			74			(71,639	)		(0.27	)
	Indices			194			74,321			0.28
	Interest Rates U.S.			135			86,595			0.33
	Interest Rates Non-U.S.			804			277,881			1.06
	Livestock			20			(3,743	)		(0.01	)
	Metals			2			(4,595	)		(0.02	)
	Softs			64			(32,076	)		(0.12	)
	Total futures contracts purchased						325,086			1.24
Futures Contracts Sold
Currencies			110			714			0	*
Energy			14			1,729			0.01
Interest Rates Non-U.S.			38			709			0	*
Livestock			17			2,340			0.01
Metals			154			81,311			0.31
Softs			86			90,430			0.34
Total futures contracts sold						177,233			0.67
Net unrealized appreciation on open futures contracts						502,319			1.91
Unrealized Appreciation on Open Forward Contracts
Currencies		$	3,443,049			27,676			0.11
Metals			12			42,192			0.16
Total unrealized appreciation on open forward contracts						69,868			0.27
Unrealized Depreciation on Open Forward Contracts
Currencies		$	7,674,640			(107,026	)		(0.41	)
Metals			108			(106,731	)		(0.41	)
Total unrealized depreciation on open forward contracts						(213,757	)		(0.82	)
Net unrealized depreciation on open forward contracts						(143,889	)		(0.55	)
Net fair value					$	358,430			1.36	%
*	Due to rounding
Rabar Master Fund L.P.
Condensed Schedule of Investments
31-Dec-14
		Notional ($)/			Fair Value			% of Partners’
		Number of						Capital
		Contracts
Futures Contracts Purchased
Currencies			4		$	6,820			0.03	%
Grains			105			(58,577	)		(0.22	)
Indices			82			37,197			0.14
Interest Rates U.S.			72			15,983			0.06
Interest Rates Non - U.S.			719			409,148			1.54
Livestock			13			1,963			0.01
Metals			63			(7,858	)		(0.03	)
Softs			73			(29,560	)		(0.11	)
Total futures contracts purchased						375,116			1.42
Futures Contracts Sold
Currencies			41			45,500			0.17
Energy			23			173,291			0.66
Interest Rates Non - U.S.			13			(353	)		0	*
Livestock			6			310			0	*
Metals			21			24,095			0.09
Softs			218			164,657			0.62
Total futures contracts sold						407,500			1.54
Net unrealized appreciation on open futures contracts						782,616			2.96
Unrealized Appreciation on Open Forward Contracts
Currencies		$	5,104,227			105,650			0.4
Metals			34			82,420			0.31
Total unrealized appreciation on open forward contracts						188,070			0.71
Unrealized Depreciation on Open Forward Contracts
Currencies		$	4,751,703			(54,439	)		(0.21	)
Metals			12			(51,986	)		(0.20	)
Total unrealized depreciation on open forward contracts						(106,425	)		(0.41	)
Net unrealized appreciation on open forward contracts						81,645			0.3
Net fair value					$	864,261			3.26	%
*	Due to rounding
Rabar Master Fund L. P.
Statements of Income and Expenses and Changes in Partners’ Capital
(Unaudited)
		Three Months Ended
		March 31,
		2015			2014
Investment Income:
Interest income		$	467		$	2,085
Total investment income			467			2,085
Expenses:
Clearing fees			30,095			72,411
Professional fees			32,583			17,679
Total expenses			62,678			90,090
Net investment income (loss)			(62,211	)		(88,005	)
Trading Results:
Net gains (losses) on trading of commodity interests:
Net realized gains (losses) on closed contracts			1,014,948			1,061,028
Change in net unrealized gains (losses) on open contracts
			(505,832	)		548,192
Total trading results			509,116			1,609,220
Net income (loss)
			446,905			1,521,215
Subscriptions
			556,330			614,000
Redemptions
			(1,214,122	)		(2,073,960	)
Distribution of interest income to feeder funds
			(467	)		(2,085	)
Net increase (decrease) in Partners’ Capital
			(211,354	)		59,170
Partners’ Capital, beginning of period			26,474,338			33,569,336
Partners’ Capital, end of period		$	26,262,984		$	33,628,506
The following tables summarize the gross and net amounts recognized relating to assets and liabilities of the Master’s derivatives and their offsetting subject to master netting arrangements or similar agreements as of March 31, 2015 and December 31, 2014, respectively.
31-Mar-15		Gross Amounts			Gross Amounts			Net Amounts			Gross Amounts Not Offset in the
		Recognized			Offset in the			Presented in the			Statements of Financial Condition
					Statements of			Statements of
					Financial			Financial
					Condition			Condition			Financial		Cash Collateral		Net Amount
											Instruments		Pledged/Received*
Assets
Futures		$	736,774		$	(234,455	)	$	502,319			—		—	$	502,319
Forwards			69,868			(69,868	)		—			—		—		—
Total assets		$	806,642		$	(304,323	)	$	502,319			—		—	$	502,319
Liabilities
Futures		$	(234,455	)	$	234,455		$	—			—		—	$	—
Forwards			(213,757	)		69,868			(143,889	)		—		—	$	(143,889	)
Total liabilities		$	(448,212	)	$	304,323		$	(143,889	)		—		—	$	(143,889	)
Net fair value															$	358,430	*
31-Dec-14		Gross Amounts			Gross Amounts			Net Amounts			Gross Amounts Not Offset in the
		Recognized			Offset in the			Presented in the			Statements of Financial Condition
					Statements of			Statements of
					Financial			Financial
					Condition			Condition			Financial		Cash Collateral		Net Amount
											Instruments		Pledged/Received*
Assets
Futures		$	953,167		$	(170,551	)	$	782,616			—		—	$	782,616
Forwards			188,070			(106,425	)		81,645			—		—	$	81,645
Total assets		$	1,141,237		$	(276,976	)	$	864,261			—		—	$	864,261
Liabilities
Futures		$	(170,551	)	$	170,551		$	—			—		—	$	—
Forwards			(106,425	)		106,425			—			—		—		—
Total liabilities		$	(276,976	)	$	276,976		$	—			—		—	$	—
Net fair value															$	864,261	*
*	In the event of default by the Partnership, MS&Co., the sole counterparty to the Partnership’s derivative contracts, has the right to offset the Partnership’s obligation with the cash held by the Partnership, thereby minimizing the counterparty’s risk of loss. There is no collateral posted by MS&Co. and as such, in the event of default by MS&Co., the Partnership is exposed to the amount shown on the Statements of Financial Condition.
Financial Highlights of the Master:
Ratios to average net assets for the three months ended March 31, 2015 and 2014, were as follows:
		Three Months Ended
		March 31,
		2015			2014
Ratios to average net assets:*
Net investment income (loss)**			(0.9	)%		(1.1	)%
Operating expenses			1	%		1.1	%
Total return			1.6	%		4.7	%
*	Annualized.
**	Interest income less total expenses.
The following tables indicate the Master’s gross fair values of derivative instruments of futures and forward contracts as separate assets and liabilities as of March 31, 2015, and December 31, 2014.
		March 31,
		2015
Assets
Futures Contracts
Currencies		$	36,901
Energy			5,438
Grains			320
Indices			123,924
Interest Rates U.S.			90,283
Interest Rates Non-U.S.			289,835
Livestock			13,830
Metals			84,638
Softs			91,605
Total unrealized appreciation on open futures contracts		$	736,774
Liabilities
Futures Contracts
Currencies		$	(37,845	)
Energy			(3,709	)
Grains			(71,959	)
Indices			(49,603	)
Interest Rates U.S.			(3,688	)
Interest Rates Non-U.S.			(11,245	)
Livestock			(15,233	)
Metals			(7,922	)
Softs			(33,251	)
Total unrealized depreciation on open futures contracts		$	(234,455	)
Net unrealized appreciation on open futures contracts		$	502,319	*
		March 31,
		2015
Assets
Forward Contracts
Currencies		$	27,676
Metals			42,192
Total unrealized appreciation on open forward contracts		$	69,868
Liabilities
Forward Contracts
Currencies		$	(107,026	)
Metals			(106,731	)
Total unrealized depreciation on open forward contracts		$	(213,757	)
Net unrealized depreciation on open forward contracts		$	(143,889	)**
*	This amount is included in “Net unrealized appreciation on open futures contracts” on the Statements of Financial Condition.
**	This amount is included in “Net unrealized depreciation on open forward contracts” on the Statements of Financial Condition.
		December 31, 2014
Assets
Futures Contracts
Currencies		$	56,190
Energy			173,291
Grains			25,950
Indices			49,637
Interest Rates U.S.			26,024
Interest Rates Non-U.S.			409,347
Livestock			5,663
Metals			34,164
Softs			172,901
Total unrealized appreciation on open futures contracts		$	953,167
Liabilities
Futures Contracts
Currencies		$	(3,870	)
Grains			(84,527	)
Indices			(12,440	)
Interest Rates U.S.			(10,041	)
Interest Rates Non-U.S.			(552	)
Livestock			(3,390	)
Metals			(17,927	)
Softs			(37,804	)
Total unrealized depreciation on open futures contracts		$	(170,551	)
Net unrealized appreciation on open futures contracts		$	782,616	*
		December 31, 2014
Assets
Forward Contracts
Currencies		$	105,650
Metals			82,420
Total unrealized appreciation on open forward contracts		$	188,070
Liabilities
Forward Contracts
Currencies		$	(54,439	)
Metals			(51,986	)
Total unrealized depreciation on open forward contracts		$	(106,425	)
Net unrealized appreciation on open forward contracts		$	81,645	**
*	This amount is included in “Net unrealized appreciation on open futures contracts” on the Statements of Financial Condition.
**	This amount is included in “Net unrealized appreciation on open forward contracts” on the Statements of Financial Condition.
The following table indicates the trading gains and losses, by market sector, on derivative instruments for the three months ended March 31, 2015 and 2014.
Sector		Three Months Ended			Three Months Ended
		March 31, 2015			31-Mar-14
Currencies		$	(194,681	)	$	(672,162	)
Energy			(46,627	)		(326,329	)
Grains			(373,994	)		1,570,464
Indices			502,438			(298,205	)
Interest Rates U.S.			251,726			(161,766	)
Interest Rates non-U.S.			582,521			426,834
Livestock			69,289			1,025,283
Metals			(36,730	)		(630,001	)
Softs			(244,826	)		675,102
Total		$	509,116	***	$	1,609,220	***
***	This amount is included in “Total trading results” on the Master’s Statements of Income and Expenses and Changes in Partner’s Capital.

Financial_Instrument_Risks

Financial Instrument Risks	3 Months Ended
	Mar. 31, 2015
Investments, All Other Investments [Abstract]
Financial Instrument Risks	6	Financial Instrument Risks:
	In the normal course of business, the Partnership, indirectly through its investment in the Master is party to financial instruments with off-balance-sheet risk, including derivative financial instruments and derivative commodity instruments. These financial instruments may include forwards, futures, options and swaps, whose values are based upon an underlying asset, index, or reference rate, and generally represent future commitments to exchange currencies or cash balances, to purchase or sell other financial instruments on specific terms on specified future dates, or, in the case of derivative commodity instruments, to have a reasonable possibility to be settled in cash, through physical delivery or with another financial instrument. These instruments may be traded on an exchange, a swap-execution facility or over-the-counter (“OTC”). Exchange-traded instruments include futures and certain standardized forward, swap and option contracts. Certain swap contracts may also be traded on a swap execution facility or OTC. OTC contracts are negotiated between contracting parties and also include certain forward and option contracts. Specific market movements of commodities or futures contracts underlying an option cannot be accurately predicted. The purchaser of an option may lose the entire premium paid for the option. The writer or seller of an option has unlimited risk. Each of these instruments is subject to various risks similar to those relating to the underlying financial instruments, including market and credit risk. In general, the risks associated with OTC contracts are greater than those associated with exchange-traded instruments because of the greater risk of default by the counterparty to an OTC contract. The General Partner estimates at any given time approximately 5.9% to 16.1% of the Partnership’s/Master’s contracts are traded OTC.
	The Master trades futures contracts. A futures contract is a firm commitment to buy or sell a specified quantity of investments, currency or a standardized amount of a deliverable grade commodity, at a specified price on a specified future date, unless the contract is closed before the delivery date or if the delivery quantity is something where physical delivery cannot occur (such as the S&P 500 Index), whereby such contract is settled in cash. Payments (“variation margin”) may be made or received by the Master each business day, depending on the daily fluctuations in the value of the underlying contracts, and are recorded as unrealized gains or losses by the Master. When the contract is closed, the Master records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. Transactions in futures contracts require participants to make both initial margin deposits of cash or other assets and variation margin deposits, through the futures broker, directly with the exchange on which the contracts are traded. Net realized gains (losses) and changes in net unrealized gains (losses) on futures contracts are included in the Statements of Income and Expenses and Changes in Partners’ Capital.
	Forward foreign currency contracts are those contracts where the Master agrees to receive or deliver a fixed quantity of foreign currency for an agreed-upon price on an agreed future date. Forward foreign currency contracts are valued daily, and the Master’s net equity therein, representing unrealized gain or loss on the contracts as measured by the difference between the forward foreign exchange.
	The Master does not isolate the portion of the results of operations arising from the effect of changes in foreign exchange rates on investments due to fluctuations from changes in market prices of investments held. Such fluctuations are included in total trading results in the Statements of Income and Expenses and Changes in Partners’ Capital.
	Metal contracts traded on the London Metals Exchange (“LME”) represent a firm commitment to buy or sell a specified quantity of aluminum, copper, lead, nickel, tin or zinc. LME contracts traded by the Master are cash settled based on prompt dates published by the LME. Payments (“variation margin”) may be made or received by the Partnership and the Master each business day, depending on the daily fluctuations in the value of the underlying contracts, and are recorded as unrealized gains or losses by the Master. A contract is considered offset when all long positions have been matched with a like number of short positions settling on the same prompt date. When the contract is closed at the prompt date, the Master records a realized gain or loss equal to the difference between the value of the contract at the time it was opened and the value at the time it was closed. Transactions in LME contracts require participants to make both initial margin deposits of cash or other assets and variation margin deposits, through the broker, directly with the LME. Net realized gains (losses) and changes in net unrealized gains (losses) on metal contracts are included in the Statements of Income and Expenses and Changes in Partners’ Capital.
	The risk to the limited partners that have purchased Redeemable Units is limited to their share of the Partnership’s net assets and undistributed profits. This limited liability is a result of the organization of the Partnership as a limited partnership under New York law.
	Market risk is the potential for changes in the value of the financial instruments traded by the Partnership and the Master due to market changes, including interest and foreign exchange rate movements and fluctuations in commodity or security prices. Market risk is directly impacted by the volatility and liquidity in the markets in which the related underlying assets are traded. The Partnership and the Master are exposed to market risk equal to the value of futures and forward contracts purchased and unlimited liability on such contracts sold short.
	Credit risk is the possibility that a loss may occur due to the failure of a counterparty to perform according to the terms of a contract. The Partnership’s and the Master’s risk of loss in the event of a counterparty default is typically limited to the amounts recognized in the Statements of Financial Condition and is not represented by the contract or notional amounts of the instruments. The Partnership’s and the Master’s risk of loss is reduced through the use of legally enforceable master netting agreements with counterparties that permit the Partnership and the Master to offset unrealized gains and losses and other assets and liabilities with such counterparties upon the occurrence of certain events. The Partnership and the Master have credit risk and concentration risk, as MS&Co. or a MS&Co. affiliate was the sole counterparty or broker with respect to the Partnership’s and the Master’s assets. Credit risk with respect to exchange-traded instruments is reduced to the extent that, through MS&Co. the Partnership’s or the Master’s counterparty is an exchange or clearing organization.
	The General Partner monitors and attempts to control the Partnership’s and the Master’s risk exposure on a daily basis through financial, credit and risk management monitoring systems, and accordingly, believes that it has effective procedures for evaluating and limiting the credit and market risks to which the Partnership and the Master may be subject. These monitoring systems generally allow the General Partner to statistically analyze actual trading results with risk-adjusted performance indicators and correlation statistics. In addition, online monitoring systems provide account analysis of futures, forward and option contracts by sector, margin requirements, gain and loss transactions and collateral positions.
	The majority of these financial instruments mature within one year of the inception date. However, due to the nature of the Partnership’s and the Master’s business, these instruments may not be held to maturity.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	7	Subsequent Events:
	The General Partner evaluates events that occur after the balance sheet date but before financial statements are issued. The General Partner has assessed the subsequent events through the date of issuance and determined that there were no subsequent events requiring adjustment of or disclosure in the financial statements.

Basis_of_Presentation_and_Summ1

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Partnership's Investment	Partnership’s Investment: The Partnership carries its investment in the Master at fair value based on the Master’s net asset value per unit as calculated by the Master. The valuation of the Master’s investments including the classification within the fair value hierarchy of the investments held by the Master are described in Note 5, “Fair Value Measurements.”
Master's Investments	Master’s Investments: Fair value of exchange-traded futures, options and forward contracts is determined by the various futures exchanges, and reflects the settlement price for each contract as of the close of business on the last business day of the reporting period. The fair value of foreign currency forward contracts is extrapolated on a forward basis from the spot prices quoted as of approximately 3:00 P.M. (E.T.) on the last business day of the reporting period from various exchanges. The fair value of non-exchange- traded foreign currency option contracts is calculated by applying an industry standard model application for options valuation of foreign currency options, using as inputs the spot prices, interest rates, and option implied volatilities quoted as of approximately 3:00 P.M. (E.T.) on the last business day of the reporting period.
	All commodity interests of the Master (including derivative financial instruments and derivative commodity instruments) are held for trading purposes. The commodity interests are recorded on the trade date and open contracts are recorded at fair value at the measurement date. Investments in commodity interests denominated in foreign currencies are translated into U.S. dollars at the exchange rates prevailing at the measurement date. Gains or losses are realized when contracts are liquidated. Unrealized gains or losses on open contracts are included as a component of equity in trading account on the Master’s Statements of Financial Condition. Net realized gains or losses and any change in net unrealized gains or losses from the preceding period are reported on the Master’s Statements of Income and Expenses and Changes in Partners’ Capital.
Investment Company Status	Investment Company Status: The Partnership adopted Accounting Standard Update (“ASU”) 2013-08, “Financial Services — Investment Companies (Topic 946): Amendments to the Scope, Measurement and Disclosure Requirements.” and based on the General Partner’s assessment, the Partnership has been deemed to be an investment company since inception.
Income Taxes	Income Taxes: Income taxes have not been provided as each partner is individually liable for the taxes, if any, on its share of the Partnership’s income and expenses. GAAP provides guidance for how uncertain tax positions should be recognized, measured, presented and disclosed in the financial statements and requires the evaluation of tax positions taken or expected to be taken in the course of preparing the Partnership’s financial statements to determine whether the tax positions are “more- likely-than-not” to be sustained by the applicable tax authority. Tax positions with respect to tax at the Partnership level not deemed to meet the “more-likely-than-not” threshold would be recorded as a tax benefit or expense in the current year. The General Partner concluded that no provision for income tax is required in the Partnership’s financial statements.
	The Partnership files U.S. federal and various state and local tax returns. No income tax returns are currently under examination. The 2011 through 2014 tax years remain subject to examination by U.S. federal and most state tax authorities. The General Partner does not believe that there are any uncertain tax positions that require recognition of a tax liability.
Recent Accounting Pronouncement	Recent Accounting Pronouncement. In May 2015, the Financial Accounting Standards Board (“FASB”) issued ASU 2015-07 “Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent)” which relates to disclosures for investments that calculate net asset value per share (potentially funds of fund structures). The ASU requires investments for which the practical expedient is used to measure fair value at Net Asset Value (“NAV”) be removed from the fair value hierarchy. Instead, an entity is required to include those investments as a reconciling line item so that the total fair value amount of investments in the disclosure is consistent with the amount on the balance sheet. Further, the ASU requires entities to provide the disclosures in Accounting Standards Codification (“ASC”) 820-10-50-6A only for investments for which they elect to use the NAV practical expedient to determine fair Value. The standard is effective for public business entities for fiscal years beginning after December 15, 2015, early adoption is permitted. The General Partner is currently evaluating the impact that the new pronouncement would have on the Partnership’s financial statements.
Net Income (Loss) per unit	Net Income (Loss) Per Unit. Net income (loss) per unit is calculated in accordance with investment company guidance. See Note 3, “Financial Highlights.”

Financial_Highlights_Tables

Financial Highlights (Tables)	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Summary of Financial Highlights for Limited Partner Class as Whole	Financial highlights for the limited partner class as a whole for the three months ended March 31, 2015 and 2014 were as follows:
		Three Months Ended
		March 31,
		2015			2014
	Net realized and unrealized gains (losses)	$	22.84		$	49.5
	Interest income		0.03			0.06
	Expenses		(21.45	)		(23.55	)
	Increase (decrease) for the year		1.42			26.01
	Net asset value per unit, beginning of period		1,171.03			1,008.02
	Net asset value per unit, end of period	$	1,172.45		$	1,034.03

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Ratios to Average Net Assets
			Three Months Ended
			March 31,
			2015			2014
	Ratios to average net assets:*
	Net investment income (loss)**			(7.4	)%		(9.4	)%
	Operating expense			7.4	%		9.5	%
	Incentive fees			—	%		—	%
	Total expenses			7.4	%		9.5	%
	Total return:
	Total return before incentive fees			0.1	%		2.6	%
	Incentive fees			—	%		—	%
	Total return after incentive fees			0.1	%		2.6	%
	*	Annualized (other than incentive fees).
	**	Interest income allocated from the Master less total expenses. Does not reflect the effects of incentive fees.
Derivative Instruments Priced at Fair Value Using Unobservable Inputs	During the three months ended March 31, 2015 and for the year ended December 31, 2014, there were no transfers of assets or liabilities between Level 1 and Level 2.
	March 31, 2015		Total			Level 1			Level 2			Level 3
	Assets
	Futures		$	736,774		$	736,774		$	—		$	—
	Forwards			69,868			42,192			27,676			—
	Total assets		$	806,642		$	778,966		$	27,676		$	—
	Liabilities
	Futures		$	234,455		$	234,455		$	—		$	—
	Forwards			213,757			106,731			107,026			—
	Total liabilities			448,212			341,186			107,026			—
	Net fair value		$	358,430		$	437,780		$	(79,350	)	$	—
	December 31, 2014		Total			Level 1			Level 2			Level 3
	Assets
	Futures		$	953,167		$	953,167		$	—		$	—
	Forwards			188,070			82,420			105,650			—
	Total assets		$	1,141,237		$	1,035,587		$	105,650		$	—
	Liabilities
	Futures		$	170,551		$	170,551		$	—		$	—
	Forwards			106,425			51,986			54,439			—
	Total liabilities			276,976			222,537			54,439			—
	Net fair value		$	864,261		$	813,050		$	51,211		$	—
Statements of Financial Condition	Rabar Master Fund L. P.
	Statements of Financial Condition
			(Unaudited)			December 31,
			March 31,			2014
			2015
	Assets:
	Equity in trading account:
	Cash		$	22,714,200		$	23,468,773
	Cash margin			3,257,982			2,188,244
	Net unrealized appreciation on open futures contracts			502,319			782,616
	Net unrealized appreciation on open forward contracts			—			81,645
	Total assets		$	26,474,501		$	26,521,278
	Liabilities and Partners’ Capital:
	Liabilities:
	Net unrealized depreciation on open forward contracts		$	143,889		$	—
	Accrued expenses:
	Professional fees			67,628			45,098
	Clearing fees due to MS&Co.			—			1,842
	Total liabilities			211,517			46,940
	Partners’ Capital:
	General Partner			—			—
	Limited Partner			26,262,984			26,474,338
	Total liabilities and Partners’ Capital		$	26,474,501		$	26,521,278
Statements of Condensed Schedules of Investments	Rabar Master Fund L.P.
	Condensed Schedule of Investments
	31-Mar-15
	(Unaudited)
			Notional ($)/			Fair Value			% of Partners’
			Number of						Capital
			Contracts
	Futures Contracts Purchased
	Currencies			7		$	(1,658	)		(0.01	)%
	Grains			74			(71,639	)		(0.27	)
	Indices			194			74,321			0.28
	Interest Rates U.S.			135			86,595			0.33
	Interest Rates Non-U.S.			804			277,881			1.06
	Livestock			20			(3,743	)		(0.01	)
	Metals			2			(4,595	)		(0.02	)
	Softs			64			(32,076	)		(0.12	)
	Total futures contracts purchased						325,086			1.24
	Futures Contracts Sold
	Currencies			110			714			0	*
	Energy			14			1,729			0.01
	Interest Rates Non-U.S.			38			709			0	*
	Livestock			17			2,340			0.01
	Metals			154			81,311			0.31
	Softs			86			90,430			0.34
	Total futures contracts sold						177,233			0.67
	Net unrealized appreciation on open futures contracts						502,319			1.91
	Unrealized Appreciation on Open Forward Contracts
	Currencies		$	3,443,049			27,676			0.11
	Metals			12			42,192			0.16
	Total unrealized appreciation on open forward contracts						69,868			0.27
	Unrealized Depreciation on Open Forward Contracts
	Currencies		$	7,674,640			(107,026	)		(0.41	)
	Metals			108			(106,731	)		(0.41	)
	Total unrealized depreciation on open forward contracts						(213,757	)		(0.82	)
	Net unrealized depreciation on open forward contracts						(143,889	)		(0.55	)
	Net fair value					$	358,430			1.36	%
	*	Due to rounding
	Rabar Master Fund L.P.
	Condensed Schedule of Investments
	31-Dec-14
			Notional ($)/			Fair Value			% of Partners’
			Number of						Capital
			Contracts
	Futures Contracts Purchased
	Currencies			4		$	6,820			0.03	%
	Grains			105			(58,577	)		(0.22	)
	Indices			82			37,197			0.14
	Interest Rates U.S.			72			15,983			0.06
	Interest Rates Non - U.S.			719			409,148			1.54
	Livestock			13			1,963			0.01
	Metals			63			(7,858	)		(0.03	)
	Softs			73			(29,560	)		(0.11	)
	Total futures contracts purchased						375,116			1.42
	Futures Contracts Sold
	Currencies			41			45,500			0.17
	Energy			23			173,291			0.66
	Interest Rates Non - U.S.			13			(353	)		0	*
	Livestock			6			310			0	*
	Metals			21			24,095			0.09
	Softs			218			164,657			0.62
	Total futures contracts sold						407,500			1.54
	Net unrealized appreciation on open futures contracts						782,616			2.96
	Unrealized Appreciation on Open Forward Contracts
	Currencies		$	5,104,227			105,650			0.4
Metals			34			82,420			0.31
Total unrealized appreciation on open forward contracts						188,070			0.71
Unrealized Depreciation on Open Forward Contracts
Currencies		$	4,751,703			(54,439	)		(0.21	)
Metals			12			(51,986	)		(0.20	)
Total unrealized depreciation on open forward contracts						(106,425	)		(0.41	)
Net unrealized appreciation on open forward contracts						81,645			0.3
Net fair value					$	864,261			3.26	%
*	Due to rounding
Statements of Income and Expenses	Rabar Master Fund L. P.
	Statements of Income and Expenses and Changes in Partners’ Capital
	(Unaudited)
			Three Months Ended
			March 31,
			2015			2014
	Investment Income:
	Interest income		$	467		$	2,085
	Total investment income			467			2,085
	Expenses:
	Clearing fees			30,095			72,411
	Professional fees			32,583			17,679
	Total expenses			62,678			90,090
	Net investment income (loss)			(62,211	)		(88,005	)
	Trading Results:
	Net gains (losses) on trading of commodity interests:
	Net realized gains (losses) on closed contracts			1,014,948			1,061,028
	Change in net unrealized gains (losses) on open contracts
				(505,832	)		548,192
	Total trading results			509,116			1,609,220
	Net income (loss)
				446,905			1,521,215
	Subscriptions
				556,330			614,000
	Redemptions
				(1,214,122	)		(2,073,960	)
	Distribution of interest income to feeder funds
				(467	)		(2,085	)
	Net increase (decrease) in Partners’ Capital
				(211,354	)		59,170
	Partners’ Capital, beginning of period			26,474,338			33,569,336
	Partners’ Capital, end of period		$	26,262,984		$	33,628,506
Rabar Master Fund L.P. [Member]
Ratios to Average Net Assets	Ratios to average net assets for the three months ended March 31, 2015 and 2014, were as follows:
			Three Months Ended
			March 31,
			2015			2014
	Ratios to average net assets:*
	Net investment income (loss)**			(0.9	)%		(1.1	)%
	Operating expenses			1	%		1.1	%
	Total return			1.6	%		4.7	%
	*	Annualized.
	**	Interest income less total expenses.
Summary of Gross and Net Amounts Recognized Relating to Assets and Liabilities	The following tables summarize the gross and net amounts recognized relating to assets and liabilities of the Master’s derivatives and their offsetting subject to master netting arrangements or similar agreements as of March 31, 2015 and December 31, 2014, respectively.
	31-Mar-15		Gross Amounts			Gross Amounts			Net Amounts			Gross Amounts Not Offset in the
			Recognized			Offset in the			Presented in the			Statements of Financial Condition
						Statements of			Statements of
						Financial			Financial
						Condition			Condition			Financial		Cash Collateral		Net Amount
												Instruments		Pledged/Received*
	Assets
	Futures		$	736,774		$	(234,455	)	$	502,319			—		—	$	502,319
	Forwards			69,868			(69,868	)		—			—		—		—
	Total assets		$	806,642		$	(304,323	)	$	502,319			—		—	$	502,319
	Liabilities
	Futures		$	(234,455	)	$	234,455		$	—			—		—	$	—
	Forwards			(213,757	)		69,868			(143,889	)		—		—	$	(143,889	)
	Total liabilities		$	(448,212	)	$	304,323		$	(143,889	)		—		—	$	(143,889	)
	Net fair value															$	358,430	*
	31-Dec-14		Gross Amounts			Gross Amounts			Net Amounts			Gross Amounts Not Offset in the
			Recognized			Offset in the			Presented in the			Statements of Financial Condition
						Statements of			Statements of
						Financial			Financial
						Condition			Condition			Financial		Cash Collateral		Net Amount
												Instruments		Pledged/Received*
	Assets
	Futures		$	953,167		$	(170,551	)	$	782,616			—		—	$	782,616
	Forwards			188,070			(106,425	)		81,645			—		—	$	81,645
	Total assets		$	1,141,237		$	(276,976	)	$	864,261			—		—	$	864,261
	Liabilities
	Futures		$	(170,551	)	$	170,551		$	—			—		—	$	—
	Forwards			(106,425	)		106,425			—			—		—		—
	Total liabilities		$	(276,976	)	$	276,976		$	—			—		—	$	—
	Net fair value															$	864,261	*
	*	In the event of default by the Partnership, MS&Co., the sole counterparty to the Partnership’s derivative contracts, has the right to offset the Partnership’s obligation with the cash held by the Partnership, thereby minimizing the counterparty’s risk of loss. There is no collateral posted by MS&Co. and as such, in the event of default by MS&Co., the Partnership is exposed to the amount shown on the Statements of Financial Condition.
Gross Fair Values of Derivative Instruments of Futures and Forward Contracts as Separate Assets and Liabilities	The following tables indicate the Master’s gross fair values of derivative instruments of futures and forward contracts as separate assets and liabilities as of March 31, 2015, and December 31, 2014.
			March 31,
			2015
	Assets
	Futures Contracts
	Currencies		$	36,901
	Energy			5,438
	Grains			320
	Indices			123,924
	Interest Rates U.S.			90,283
	Interest Rates Non-U.S.			289,835
	Livestock			13,830
	Metals			84,638
	Softs			91,605
	Total unrealized appreciation on open futures contracts		$	736,774
	Liabilities
	Futures Contracts
	Currencies		$	(37,845	)
	Energy			(3,709	)
	Grains			(71,959	)
	Indices			(49,603	)
	Interest Rates U.S.			(3,688	)
	Interest Rates Non-U.S.			(11,245	)
	Livestock			(15,233	)
	Metals			(7,922	)
	Softs			(33,251	)
	Total unrealized depreciation on open futures contracts		$	(234,455	)
	Net unrealized appreciation on open futures contracts		$	502,319	*
			March 31,
			2015
	Assets
	Forward Contracts
	Currencies		$	27,676
	Metals			42,192
	Total unrealized appreciation on open forward contracts		$	69,868
	Liabilities
	Forward Contracts
	Currencies		$	(107,026	)
	Metals			(106,731	)
	Total unrealized depreciation on open forward contracts		$	(213,757	)
	Net unrealized depreciation on open forward contracts		$	(143,889	)**
	*	This amount is included in “Net unrealized appreciation on open futures contracts” on the Statements of Financial Condition.
	**	This amount is included in “Net unrealized depreciation on open forward contracts” on the Statements of Financial Condition.
			December 31, 2014
	Assets
	Futures Contracts
	Currencies		$	56,190
	Energy			173,291
	Grains			25,950
	Indices			49,637
	Interest Rates U.S.			26,024
	Interest Rates Non-U.S.			409,347
	Livestock			5,663
	Metals			34,164
	Softs			172,901
	Total unrealized appreciation on open futures contracts		$	953,167
	Liabilities
	Futures Contracts
	Currencies		$	(3,870	)
	Grains			(84,527	)
	Indices			(12,440	)
	Interest Rates U.S.			(10,041	)
	Interest Rates Non-U.S.			(552	)
	Livestock			(3,390	)
Metals			(17,927	)
Softs			(37,804	)
Total unrealized depreciation on open futures contracts		$	(170,551	)
Net unrealized appreciation on open futures contracts		$	782,616	*
		December 31, 2014
Assets
Forward Contracts
Currencies		$	105,650
Metals			82,420
Total unrealized appreciation on open forward contracts		$	188,070
Liabilities
Forward Contracts
Currencies		$	(54,439	)
Metals			(51,986	)
Total unrealized depreciation on open forward contracts		$	(106,425	)
Net unrealized appreciation on open forward contracts		$	81,645	**
*	This amount is included in “Net unrealized appreciation on open futures contracts” on the Statements of Financial Condition.
**	This amount is included in “Net unrealized appreciation on open forward contracts” on the Statements of Financial Condition.
Trading Gains and Losses, by Market Sector, on Derivative Instruments	The following table indicates the trading gains and losses, by market sector, on derivative instruments for the three months ended March 31, 2015 and 2014.
	Sector		Three Months Ended			Three Months Ended
			March 31, 2015			31-Mar-14
	Currencies		$	(194,681	)	$	(672,162	)
	Energy			(46,627	)		(326,329	)
	Grains			(373,994	)		1,570,464
	Indices			502,438			(298,205	)
	Interest Rates U.S.			251,726			(161,766	)
	Interest Rates non-U.S.			582,521			426,834
	Livestock			69,289			1,025,283
	Metals			(36,730	)		(630,001	)
	Softs			(244,826	)		675,102
	Total		$	509,116	***	$	1,609,220	***
	***	This amount is included in “Total trading results” on the Master’s Statements of Income and Expenses and Changes in Partner’s Capital.

Organization_Additional_Inform

Organization - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended	6 Months Ended
	Mar. 31, 2015	Dec. 01, 2012	Mar. 31, 2015	Sep. 30, 2014	Mar. 31, 2014
Related Party Transaction [Line Items]
Maximum number of units sold by Limited Partnership	0		0
Administrative fee	1.00%
Rabar Master Fund L.P. [Member]
Related Party Transaction [Line Items]
Cash paid		$31,143,887
Morgan Stanley Wealth Management [Member] | Selling Agreement [Member]
Related Party Transaction [Line Items]
Per year brokerage fee			2.00%	3.00%	5.25%

Basis_of_Presentation_and_Summ2

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Provision for income tax	$0
Rabar Master Fund L.P. [Member]
Debt Instrument [Line Items]
Percent of partnership	100.00%	100.00%

Financial_Highlights_Summary_o

Financial Highlights - Summary of Financial Highlights for limited Partner Class as Whole (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Banking and Thrift [Abstract]
Net realized and unrealized gains (losses)	$22.84	$49.50
Interest income	$0.03	$0.06
Expenses	($21.45)	($23.55)
Increase (decrease) for the year	$1.42	$26.01
Net asset value per unit, beginning of period	$1,171.03	$1,008.02
Net asset value per unit, end of period	$1,172.45	$1,034.03

Financial_Highlights_Ratios_to

Financial Highlights - Ratios to Average Net Assets (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Ratios to average net assets:
Net investment income (loss)	-7.40%	-9.40%
Operating expense	7.40%	9.50%
Incentive fees	0.00%	0.00%
Total expenses	7.40%	9.50%
Total return:
Total return before incentive fees	0.10%	2.60%
Incentive fees	0.00%	0.00%
Total return after incentive fees	0.10%	2.60%

Trading_Activities_Additional_

Trading Activities - Additional Information (Detail) (Master [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
	Contract	Contract
Futures Contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Average number of derivative contracts traded	1,461	2,204
Forward Contracts [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Average notional values of currency forward contracts held by the Master	16,578,769	10,292,148
Forward Contracts [Member] | Metals [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Average number of derivative contracts traded	103	170

Fair_Value_Measurements_Deriva

Fair Value Measurements - Derivative Instruments Priced at Fair Value Using Unobservable Inputs (Detail) (Rabar Master Fund L.P. [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Assets
Total assets	$806,642	$1,141,237
Liabilities
Total liabilities	448,212	276,976
Net fair value	358,430	864,261
Futures Contracts [Member]
Assets
Derivative Assets	736,774	953,167
Liabilities
Derivatives liabilities	234,455	170,551
Forward Contracts [Member]
Assets
Derivative Assets	69,868	188,070
Liabilities
Derivatives liabilities	213,757	106,425
Unadjusted Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]
Assets
Total assets	778,966	1,035,587
Liabilities
Total liabilities	341,186	222,537
Net fair value	437,780	813,050
Unadjusted Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] | Futures Contracts [Member]
Assets
Derivative Assets	736,774	953,167
Liabilities
Derivatives liabilities	234,455	170,551
Unadjusted Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] | Forward Contracts [Member]
Assets
Derivative Assets	42,192	82,420
Liabilities
Derivatives liabilities	106,731	51,986
Significant Other Observable Inputs (Level 2) [Member]
Assets
Total assets	27,676	105,650
Liabilities
Total liabilities	107,026	54,439
Net fair value	-79,350	51,211
Significant Other Observable Inputs (Level 2) [Member] | Forward Contracts [Member]
Assets
Derivative Assets	27,676	105,650
Liabilities
Derivatives liabilities	$107,026	$54,439

Fair_Value_Measurements_Statem

Fair Value Measurements - Statements of Financial Condition (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Equity in trading account:
Cash	$93,727	$5,730
Total assets	26,356,854	26,480,194
Accrued expenses:
Total liabilities	361,799	415,554
Partners' Capital:
General Partner	291,047	290,694
Limited Partner	21,923.26	22,009.64
Total liabilities and partners' capital	26,356,854	26,480,194
Rabar Master Fund L.P. [Member]
Equity in trading account:
Cash	22,714,200	23,468,773
Cash margin	3,257,982	2,188,244
Total assets	26,474,501	26,521,278
Liabilities:
Net unrealized depreciation on open forward contracts	143,889	-81,645
Accrued expenses:
Professional fees	67,628	45,098
Total liabilities	211,517	46,940
Partners' Capital:
General Partner	0	0
Limited Partner	26,262,984	26,474,338
Total liabilities and partners' capital	26,474,501	26,521,278
Rabar Master Fund L.P. [Member] | Futures Contracts [Member]
Equity in trading account:
Net unrealized appreciation on open contracts	502,319	782,616
Rabar Master Fund L.P. [Member] | Forward Contracts [Member]
Equity in trading account:
Net unrealized appreciation on open contracts	-143,889	81,645
Rabar Master Fund L.P. [Member] | Morgan Stanley and Company LLC [Member]
Accrued expenses:
Clearing fees due to MS&Co.		$1,842

Fair_Value_Measurements_Statem1

Fair Value Measurements - Statements of Condensed Schedules of Investments (Detail) (USD $)	Mar. 31, 2015		Dec. 31, 2014
Investment Holdings [Line Items]
Futures contracts purchased and sold, fair value	$26,263,127	[1]	$26,474,464	[1]
Rabar Master Fund L.P. [Member]
Investment Holdings [Line Items]
Net unrealized appreciation on open forward contracts			782,616
Unrealized appreciation on open forward contracts, fair value	69,868		188,070
Unrealized depreciation on open forward contracts, fair value	-213,757		-106,425
Net unrealized depreciation on open forward contracts, fair value	-143,889		81,645
Net fair value	358,430		864,261
Net unrealized appreciation on open futures contracts, percentage of partners' capital			2.96%
Unrealized appreciation on open forward contracts, percentage of partners' capital	0.27%		0.71%
Unrealized depreciation on open forward contracts, percentage of partners' capital	-0.82%		-0.41%
Net unrealized depreciation on open forward contracts, percentage of partners' capital	-0.55%		0.30%
Net fair value, percentage of partners' capital	1.36%		3.26%
Rabar Master Fund L.P. [Member] | Currencies [Member]
Investment Holdings [Line Items]
Unrealized Appreciation on Open Forward Contracts, Notional value	3,443,049		5,104,227
Unrealized Appreciation on Open Forward Contracts, Notional value	7,674,640		4,751,703
Unrealized appreciation on open forward contracts, fair value	27,676		105,650
Unrealized depreciation on open forward contracts, fair value	-107,026		-54,439
Unrealized appreciation on open forward contracts, percentage of partners' capital	0.11%		0.40%
Unrealized depreciation on open forward contracts, percentage of partners' capital	-0.41%		-0.21%
Rabar Master Fund L.P. [Member] | Metals [Member]
Investment Holdings [Line Items]
Unrealized appreciation on open forward contracts, Number of contracts	12		34
Unrealized appreciation on open forward contracts, Number of contracts	108		12
Unrealized appreciation on open forward contracts, fair value	42,192		82,420
Unrealized depreciation on open forward contracts, fair value	-106,731		-51,986
Unrealized appreciation on open forward contracts, percentage of partners' capital	0.16%		0.31%
Unrealized depreciation on open forward contracts, percentage of partners' capital	-0.41%		-0.20%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, fair value	325,086		375,116
Futures contracts purchased and sold, percentage of partners' capital	1.24%		1.42%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Currencies [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	7		4
Futures contracts purchased and sold, fair value	-1,658		6,820
Futures contracts purchased and sold, percentage of partners' capital	-0.01%		0.03%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Grains [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	74		105
Futures contracts purchased and sold, fair value	-71,639		-58,577
Futures contracts purchased and sold, percentage of partners' capital	-0.27%		-0.22%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Indices [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	194		82
Futures contracts purchased and sold, fair value	74,321		37,197
Futures contracts purchased and sold, percentage of partners' capital	0.28%		0.14%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Interest Rates U.S. [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	135		72
Futures contracts purchased and sold, fair value	86,595		15,983
Futures contracts purchased and sold, percentage of partners' capital	0.33%		0.06%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Interest Rates Non - U.S. [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	804		719
Futures contracts purchased and sold, fair value	277,881		409,148
Futures contracts purchased and sold, percentage of partners' capital	1.06%		1.54%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Livestock [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	20		13
Futures contracts purchased and sold, fair value	-3,743		1,963
Futures contracts purchased and sold, percentage of partners' capital	-0.01%		0.01%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Softs [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	64		73
Futures contracts purchased and sold, fair value	-32,076		-29,560
Futures contracts purchased and sold, percentage of partners' capital	-0.12%		-0.11%
Rabar Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Metals [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	2		63
Futures contracts purchased and sold, fair value	-4,595		-7,858
Futures contracts purchased and sold, percentage of partners' capital	-0.02%		-0.03%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, fair value	177,233		407,500
Net unrealized appreciation on open forward contracts	502,319
Futures contracts purchased and sold, percentage of partners' capital	0.67%		1.54%
Net unrealized appreciation on open futures contracts, percentage of partners' capital	1.91%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Currencies [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	110		41
Futures contracts purchased and sold, fair value	714		45,500
Futures contracts purchased and sold, percentage of partners' capital	0.00%		0.17%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Energy [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	14		23
Futures contracts purchased and sold, fair value	1,729		173,291
Futures contracts purchased and sold, percentage of partners' capital	0.01%		0.66%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Interest Rates Non - U.S. [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	38		13
Futures contracts purchased and sold, fair value	709		-353
Futures contracts purchased and sold, percentage of partners' capital	0.00%		0.00%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Livestock [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	17		6
Futures contracts purchased and sold, fair value	2,340		310
Futures contracts purchased and sold, percentage of partners' capital	0.01%		0.00%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Softs [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	86		218
Futures contracts purchased and sold, fair value	90,430		164,657
Futures contracts purchased and sold, percentage of partners' capital	0.34%		0.62%
Rabar Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Metals [Member]
Investment Holdings [Line Items]
Futures contracts purchased and sold, number of contracts	154		21
Futures contracts purchased and sold, fair value	$81,311		$24,095
Futures contracts purchased and sold, percentage of partners' capital	0.31%		0.09%
[1]	Defined in Note 1.

Fair_Value_Measurements_Statem2

Fair Value Measurements - Statements of Income and Expenses (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Investment Holdings [Line Items]
Total investment income	$467	$1,641
Professional fees	133,038	130,357
Total expenses	477,207	600,551
Net investment income (loss)	-476,740	-598,910
Net realized gains (losses) on closed contracts	1,014,948	833,710
Change in net unrealized gains (losses) on open contracts	-505,832	429,106
Total trading results	509,116	1,262,816
Net income (loss)	32,376	663,906
Redemptions	-658,291	-650,194
Net increase (decrease) in Partners' Capital	-69,585	627,712
Partners' Capital, beginning of period	26,064,640	25,520,809
Partners' Capital, end of period	25,995,055	26,148,521
Rabar Master Fund L.P. [Member]
Investment Holdings [Line Items]
Interest income	467	2,085
Total investment income	467	2,085
Clearing fees	30,095	72,411
Professional fees	32,583	17,679
Total expenses	62,678	90,090
Net investment income (loss)	-62,211	-88,005
Net realized gains (losses) on closed contracts	1,014,948	1,061,028
Change in net unrealized gains (losses) on open contracts	-505,832	548,192
Total trading results	509,116	1,609,220
Net income (loss)	446,905	1,521,215
Subscriptions	556,330	614,000
Redemptions	-1,214,122	-2,073,960
Distribution of interest income to feeder funds	-467	-2,085
Net increase (decrease) in Partners' Capital	-211,354	59,170
Partners' Capital, beginning of period	26,474,338	33,569,336
Partners' Capital, end of period	$26,262,984	$33,628,506

Fair_Value_Measurements_Summar

Fair Value Measurements - Summary of Gross and Net Amounts Recognized Relating to Assets and Liabilities of Master's Derivatives and their Offsetting Subject to Master Netting Arrangements or Similar Agreements (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Net fair value	$358,430	$864,261
Rabar Master Fund L.P. [Member]
Investment Holdings [Line Items]
Gross Amounts Recognized	806,642	1,141,237
Gross Amounts Offset in the Statements of Financial Condition	-304,323	-276,976
Net Amounts Presented in the Statements of Financial Condition	502,319	864,261
Gross amounts not offset in the Statements of Financial Condition, Financial Instruments, Assets	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received, Assets	0	0
Net Amount, Assets	502,319	864,261
Gross Amounts Recognized	-448,212	-276,976
Gross Amounts Offset in the Statements of Financial Condition	304,323	276,976
Net Amounts Presented in the Statements of Financial Condition	-143,889
Gross amounts not offset in the Statements of Financial Condition, Financial Instruments, Liabilities	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received, Liabilities	0	0
Net Amount, Liabilities	-143,889
Rabar Master Fund L.P. [Member] | Futures Contracts [Member]
Investment Holdings [Line Items]
Gross Amounts Recognized	736,774	953,167
Gross Amounts Offset in the Statements of Financial Condition	-234,455	-170,551
Net Amounts Presented in the Statements of Financial Condition	502,319	782,616
Gross amounts not offset in the Statements of Financial Condition, Financial Instruments, Assets	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received, Assets	0	0
Net Amount, Assets	502,319	782,616
Gross Amounts Recognized	-234,455	-170,551
Gross Amounts Offset in the Statements of Financial Condition	234,455	170,551
Gross amounts not offset in the Statements of Financial Condition, Financial Instruments, Liabilities	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received, Liabilities	0	0
Rabar Master Fund L.P. [Member] | Forward Contracts [Member]
Investment Holdings [Line Items]
Gross Amounts Recognized	69,868	188,070
Gross Amounts Offset in the Statements of Financial Condition	-69,868	-106,425
Net Amounts Presented in the Statements of Financial Condition		81,645
Gross amounts not offset in the Statements of Financial Condition, Financial Instruments, Assets	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received, Assets	0	0
Net Amount, Assets		81,645
Gross Amounts Recognized	-213,757	-106,425
Gross Amounts Offset in the Statements of Financial Condition	69,868	106,425
Net Amounts Presented in the Statements of Financial Condition	-143,889
Gross amounts not offset in the Statements of Financial Condition, Financial Instruments, Liabilities	0	0
Gross Amounts Not Offset in the Statements of Financial Condition, Cash Collateral Received, Liabilities	0	0
Net Amount, Liabilities	($143,889)

Fair_Value_Measurements_Ratios

Fair Value Measurements - Ratios to Average Net Assets (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Ratios to average net assets:
Net investment income (loss)	-7.40%	-9.40%
Operating expenses	7.40%	9.50%
Rabar Master Fund L.P. [Member]
Ratios to average net assets:
Net investment income (loss)	-0.90%	-1.10%
Operating expenses	1.00%	1.10%
Total return	1.60%	4.70%

Fair_Value_Measurements_Gross_

Fair Value Measurements - Gross Fair Values of Derivative Instruments of Futures and Forward Contracts as Separate Assets and Liabilities (Detail) (Rabar Master Fund L.P. [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
Assets
Derivative instruments of futures and forward contracts Assets	$69,868	$188,070
Liabilities
Derivative instruments of futures and forward contracts liabilities	-213,757	-106,425
Forward Contracts [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Net unrealized appreciation/depreciation on open futures and forward contracts	-143,889	81,645
Assets
Derivative instruments of futures and forward contracts Assets	69,868	188,070
Forward Contracts [Member] | Derivative Assets [Member] | Currencies [Member]
Assets
Derivative instruments of futures and forward contracts Assets	27,676	105,650
Forward Contracts [Member] | Derivative Assets [Member] | Metals [Member]
Assets
Derivative instruments of futures and forward contracts Assets	42,192	82,420
Forward Contracts [Member] | Derivative Liabilities [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-213,757	-106,425
Forward Contracts [Member] | Derivative Liabilities [Member] | Currencies [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-107,026	-54,439
Forward Contracts [Member] | Derivative Liabilities [Member] | Metals [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-106,731	-51,986
Futures Contracts [Member]
Fair Values Of Financial Assets And Liabilities Including Derivative Financial Instruments [Line Items]
Net unrealized appreciation/depreciation on open futures and forward contracts	502,319	782,616
Futures Contracts [Member] | Derivative Assets [Member]
Assets
Derivative instruments of futures and forward contracts Assets	736,774	953,167
Futures Contracts [Member] | Derivative Assets [Member] | Currencies [Member]
Assets
Derivative instruments of futures and forward contracts Assets	36,901	56,190
Futures Contracts [Member] | Derivative Assets [Member] | Metals [Member]
Assets
Derivative instruments of futures and forward contracts Assets	84,638	34,164
Futures Contracts [Member] | Derivative Assets [Member] | Energy [Member]
Assets
Derivative instruments of futures and forward contracts Assets	5,438	173,291
Futures Contracts [Member] | Derivative Assets [Member] | Indices [Member]
Assets
Derivative instruments of futures and forward contracts Assets	123,924	49,637
Futures Contracts [Member] | Derivative Assets [Member] | Interest Rates Non - U.S. [Member]
Assets
Derivative instruments of futures and forward contracts Assets	289,835	409,347
Futures Contracts [Member] | Derivative Assets [Member] | Interest Rates U.S. [Member]
Assets
Derivative instruments of futures and forward contracts Assets	90,283	26,024
Futures Contracts [Member] | Derivative Assets [Member] | Livestock [Member]
Assets
Derivative instruments of futures and forward contracts Assets	13,830	5,663
Futures Contracts [Member] | Derivative Assets [Member] | Softs [Member]
Assets
Derivative instruments of futures and forward contracts Assets	91,605	172,901
Futures Contracts [Member] | Derivative Assets [Member] | Grains [Member]
Assets
Derivative instruments of futures and forward contracts Assets	320	25,950
Futures Contracts [Member] | Derivative Liabilities [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-234,455	-170,551
Futures Contracts [Member] | Derivative Liabilities [Member] | Currencies [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-37,845	-3,870
Futures Contracts [Member] | Derivative Liabilities [Member] | Metals [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-7,922	-17,927
Futures Contracts [Member] | Derivative Liabilities [Member] | Energy [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-3,709
Futures Contracts [Member] | Derivative Liabilities [Member] | Indices [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-49,603	-12,440
Futures Contracts [Member] | Derivative Liabilities [Member] | Interest Rates Non - U.S. [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-11,245	-552
Futures Contracts [Member] | Derivative Liabilities [Member] | Interest Rates U.S. [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-3,688	-10,041
Futures Contracts [Member] | Derivative Liabilities [Member] | Livestock [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-15,233	-3,390
Futures Contracts [Member] | Derivative Liabilities [Member] | Softs [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	-33,251	-37,804
Futures Contracts [Member] | Derivative Liabilities [Member] | Grains [Member]
Liabilities
Derivative instruments of futures and forward contracts liabilities	($71,959)	($84,527)

Fair_Value_Measurements_Tradin

Fair Value Measurements - Trading Gains and Losses, by Market Sector, on Derivative Instruments (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	$509,116	$1,262,816
Rabar Master Fund L.P. [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	509,116	1,609,220
Rabar Master Fund L.P. [Member] | Currencies [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	-194,681	-672,162
Rabar Master Fund L.P. [Member] | Energy [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	-46,627	-326,329
Rabar Master Fund L.P. [Member] | Grains [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	-373,994	1,570,464
Rabar Master Fund L.P. [Member] | Indices [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	502,438	-298,205
Rabar Master Fund L.P. [Member] | Interest Rates U.S. [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	251,726	-161,766
Rabar Master Fund L.P. [Member] | Interest Rates Non - U.S. [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	582,521	426,834
Rabar Master Fund L.P. [Member] | Livestock [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	69,289	1,025,283
Rabar Master Fund L.P. [Member] | Metals [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	-36,730	-630,001
Rabar Master Fund L.P. [Member] | Softs [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Gain (loss) from trading	($244,826)	$675,102

Financial_Instrument_Risks_Add

Financial Instrument Risks - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
General partner OTC minimum	5.90%
General partner OTC maximum	16.10%
Financial instruments maturity year	1 year