Ceres Tactical Commodity 10-Q 13 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'ck0001325676	'
Entity Registrant Name	'MANAGED FUTURES PREMIER AVENTIS II L.P.	'
Entity Central Index Key	'0001325676	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	150,343.16

Statements_of_Financial_Condit

Statements of Financial Condition (USD $)	Sep. 30, 2014	Dec. 31, 2013
Assets:	'	'
Investment in Master, at fair value	$223,335,014	$266,266,592
Cash	111,065	29,913
Total assets	223,446,079	266,296,505
Accrued expenses:	'	'
Ongoing selling agent fees	465,513	832,177
Management fees	232,153	331,790
Administrative fees	92,861	110,597
Other	113,797	32,578
Redemptions payable to General Partner	150,168	'
Redemptions payable to Limited Partners	3,411,508	5,266,061
Total liabilities	4,466,000	6,573,203
Partners' Capital:	'	'
General Partner, 1,648.4455 and 2,098.5145 unit equivalents outstanding at September 30, 2014 and December 31, 2013, respectively	2,398,203	3,038,670
Limited Partners, 148,871.2117 and 177,267.3287 Redeemable Units outstanding at September 30, 2014 and December 31, 2013, respectively	216,581,876	256,684,632
Total partners' capital	218,980,079	259,723,302
Total liabilities and partners' capital	$223,446,079	$266,296,505
Net asset value per unit	1,454.83	1,448.01

Statements_of_Financial_Condit1

Statements of Financial Condition (Parenthetical)	Sep. 30, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]	'	'
General Partner, unit equivalents outstanding	1,648.45	2,098.51
Limited Partners, Redeemable Units outstanding	148,871.21	177,267.33

Statements_of_Income_and_Expen

Statements of Income and Expenses and Changes in Partners' Capital (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Income:	'		'		'		'
Interest income allocated from Master	$5,652		$10,519		$28,631		$55,922
Expenses:	'		'		'		'
Expenses allocated from Master	1,068,413		1,313,220		3,407,187		2,836,956
Ongoing selling agent fees	1,410,877		2,560,604		5,213,675		7,604,841
Management fees	703,692		1,020,552		2,312,803		2,907,619
Administrative fees	281,477		340,184		882,581		1,010,424
Other	114,218		67,537		296,429		184,818
Total expenses	3,578,677		5,302,097		12,112,675		14,544,658
Net investment income (loss)	-3,573,025		-5,291,578		-12,084,044		-14,488,736
Trading Results:	'		'		'		'
Net realized gains (losses) on closed contracts allocated from Master	10,888,753		702,096		14,834,480		-50,499
Change in net unrealized gains (losses) on open contracts allocated from Master	770,554		5,088,536		-2,871,377		3,343,319
Total trading results allocated from Master	11,659,307		5,790,632		11,963,103		3,292,820
Net income (loss)	8,086,282		499,054		-120,941		-11,195,916
Subscriptions - Limited Partners	1,461,365		9,253,765		8,418,459		51,419,270
Redemptions - Limited Partners	-650,092		'		-650,092		'
Redemptions - General Partner	-11,635,592		-14,861,816		-48,390,649		-54,314,313
Net increase (decrease) in Partners' Capital	-2,738,037		-5,108,997		-40,743,223		-14,090,959
Partners' Capital, beginning of period	221,718,116		269,239,786		259,723,302		278,221,748
Partners' Capital, end of period	$218,980,079		$264,130,789		$218,980,079		$264,130,789
Net asset value per unit (150,519.6572 and 184,696.2952 Units outstanding at September 30, 2014 and 2013, respectively)	1,454.83		1,430.08		1,454.83		1,430.08
Net income per unit	$51.60	[1]	$2.28	[1]	$6.82	[1]	($61.11)	[1]
Weighted average units outstanding	155,778.38		189,389.66		166,152.57		184,728.00
[1]	Based on change in net asset value per unit.

Statements_of_Income_and_Expen1

Statements of Income and Expenses and Changes in Partners' Capital (Parenthetical)	Sep. 30, 2014	Sep. 30, 2013
Income Statement [Abstract]	'	'
Net asset value per units outstanding	150,519.66	184,696.30

General

General	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
General	'
	1. General:
	Managed Futures Premier Aventis II L.P. (formerly known as Bristol Energy Fund L.P.) (the “Partnership”) is a limited partnership organized on April 20, 2005 under the partnership laws of the State of New York to engage, directly or indirectly, in the speculative trading of commodity interests on U.S. and international futures, options on futures and forward markets. The Partnership may also engage, directly or indirectly, in swap transactions and other derivative transactions with the approval of the General Partner (defined below). Initially, the Partnership’s investment strategy focused on energy and energy-related investments. While the Partnership is expected to continue to have significant exposure to energy and energy-related markets, such trading will no longer be the Partnership’s primary focus. Therefore, the Partnership’s past trading performance will not necessarily be indicative of future results. The commodity interests that are traded by the Partnership, through its investment in MB Master Fund L.P. (“MB Master”), are volatile and involve a high degree of market risk. During the initial offering period, the Partnership sold 11,925 redeemable units of limited partnership interest (“Redeemable Units”). The Partnership commenced trading on September 6, 2005. The Partnership privately and continuously offers 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, 2014, all trading decisions for the Partnership are made by the Advisor (defined below).
	During the three and nine months ended September 30, 2014, the Partnership’s/MB Master’s commodity broker was Morgan Stanley & Co. LLC (“MS&Co.”), a registered futures commission merchant. During prior periods included in this report, Citigroup Global Markets Inc. (“CGM”) also served as a commodity broker.
	During the third quarter of 2013, MB Master entered into a futures brokerage account agreement with MS&Co. MB Master commenced futures trading through an account at MS&Co. on or about August 19, 2013. Effective September 4, 2013, the Partnership entered into a futures brokerage account agreement with MS&Co. and began transferring the brokerage account of the Partnership from CGM to MS&Co. The Partnership, through its investment in MB Master, pays MS&Co. trading fees for the clearing and, where applicable, execution of transactions.
	Effective October 1, 2013, the Partnership ceased paying a brokerage fee to CGM. Also effective October 1, 2013, the Partnership 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 received a monthly ongoing selling agent fee equal to 3.75% per year of the Partnership’s adjusted net assets. The ongoing selling agent fee received by Morgan Stanley Wealth Management was shared with the properly registered/licensed financial advisors of Morgan Stanley Wealth Management who sold Redeemable Units in the Partnership.
	Effective March 1, 2014, the management fee paid to Aventis Asset Management, LLC (“Aventis”) was reduced from an annual rate of 1.50% per year to an annual rate of 1.25% per year.
	Effective April 1, 2014, the monthly ongoing selling agent fee was reduced from an annual rate of 3.75% to an annual rate of 2.50%.
	Effective October 1, 2014, the monthly ongoing selling agent fee was reduced from annual rate of 2.50% to an annual rate of 2.00%. As of the same date, the administrative fee was increased from an annual rate of 0.50% to an annual rate of 1.00%. The October 1, 2014 fee changes have offset each other and, accordingly, there was no change to the aggregate fees incurred by the Partnership.
	Certain prior period amounts have been reclassified to conform to current period presentation. Amounts reported on the Statements of Income and Expenses and Changes in Partners Capital as ongoing selling agent fees were previously presented as brokerage fees.
	The General Partner and each limited partner 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 contribution and profits, if any, net of distributions and losses, if any.
	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 statement of the Partnership’s financial condition at September 30, 2014 and December 31, 2013, and the results of its operations and changes in partners’ capital for the three and nine months ended September 30, 2014 and 2013. 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 filed with the Securities and Exchange Commission (the “SEC”) for the year ended December 31, 2013.
	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.
	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.

Financial_Highlights

Financial Highlights	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Financial Highlights	'
	2. Financial Highlights:
	Changes in the net asset value per unit for the three and nine months ended September 30, 2014 and 2013 were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Net realized and unrealized gains (losses)*		$	58.76		$	9.92		$	28.07		$	(38.55	)
	Interest income allocated from Master			0.03			0.06			0.17			0.32
	Expenses**			(7.19	)		(7.70	)		(21.42	)		(22.88	)
	Increase (decrease) for the period			51.6			2.28			6.82			(61.11	)
	Net asset value per unit, beginning of period			1,403.23			1,427.80			1,448.01			1,491.19
	Net asset value per unit, end of period		$	1,454.83		$	1,430.08		$	1,454.83		$	1,430.08
	*	Includes ongoing selling agent fees and clearing fees allocated from Master. Net realized and unrealized gains (losses) excluding ongoing selling agent fees and clearing fees allocated from Master for the three months ended September 30, 2014 and 2013 and for the nine months ended September 30, 2014 and 2013 were $74.53, $30.21, $79.21, and $17.35, respectively.
	**	Excludes ongoing selling agent fees and clearing fees allocated from Master and includes incentive fees/allocation to the Special Limited Partner, if any. Total expenses including ongoing selling agent fees and clearing fees allocated from Master for the three months ended September 30, 2014 and 2013 and for the nine months ended September 30, 2014 and 2013 were $(22.96), $(27.99), $(72.56), and $(78.78), respectively.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Ratios to average net assets:***
	Net investment income (loss)			(6.4	)%		(7.9	)%		(7.0	)%		(7.3	)%
	Incentive fees/allocation to Special Limited Partner			—	%		—	%		—	%		—	%
	Net investment income (loss) before incentive fees/allocation to Special Limited Partner****			(6.4	)%		(7.9	)%		(7.0	)%		(7.3	)%
	Operating expenses			6.4	%		7.9	%		7	%		7.4	%
	Incentive fees/allocation to Special Limited Partner			—	%		—	%		—	%		—	%
	Total expenses and incentive fees/allocation to Special Limited Partner			6.4	%		7.9	%		7	%		7.4	%
	Total return:
	Total return before incentive fees/allocation to Special Limited Partner			3.7	%		0.2	%		0.5	%		(4.1	)%
	Incentive fees/allocation to Special Limited Partner			—	%		—	%		—	%		—	%
	Total return after incentive fees/allocation to Special Limited Partner			3.7	%		0.2	%		0.5	%		(4.1	)%
	***	Annualized (except for incentive fees/allocation to the Special Limited Partner, if applicable).
	****	Interest income allocated from Master less total expenses (exclusive of incentive fees/allocation to the Special Limited Partner, if applicable.
	The above ratios 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 each limited partner’s share of income, expenses and average net assets.

Trading_Activities

Trading Activities	9 Months Ended
	Sep. 30, 2014
Brokers and Dealers [Abstract]	'
Trading Activities	'
	3. 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 Partnership’s pro-rata share of the results of the Master’s (defined in Note 5, “Investment in Master”) trading activities are shown in the Statements of Income and Expenses and Changes in Partners Capital.
	The customer agreement among the Partnership, MS&Co. and the Master gives, and the customer agreements between the Partnership and CGM and between the Master and CGM each gave, the Partnership and the Master, respectively, the legal right to net unrealized gains and losses on open futures contracts and exchange-cleared swap contracts. The Master nets, for financial reporting purposes, the unrealized gains and losses on open futures and exchange-cleared swap contracts on the Statements of Financial Condition as the criteria under Accounting Standards Codification (“ASC”) 210-20, “Balance Sheet,” have been met.
	Brokerage fees previously paid to CGM were calculated as a percentage of the Partnership’s adjusted net asset value on the last day of each month and were affected by trading performance and redemptions. Trading and transaction fees are based on the number of trades executed by the Advisor for the Master and the Partnership’s percentage ownership of the Master.
	All of the commodity interests owned by the Master are held for trading purposes. The monthly average number of futures contracts traded during the three months ended September 30, 2014 and 2013 were 10,669 and 10,847, respectively. The monthly average number of futures contracts traded during the nine months ended September 30, 2014 and 2013 were 13,140 and 8,283, respectively. The monthly average number of option contracts traded during the three months ended September 30, 2014 and 2013 were 41,463 and 68,656, respectively. The monthly average number of option contracts traded during the nine months ended September 30, 2014 and 2013 were 65,060 and 92,604, respectively. The monthly average notional value of currency forward contracts held during the three months ended September 30, 2014 and 2013 were $0 and $473,623, respectively. The monthly average notional value of currency forward contracts held during the nine months ended September 30, 2014 and 2013 were $0 and $157,874, respectively.
	On January 1, 2013, the Partnership adopted Accounting Standards Update (“ASU”) 2011-11, “Disclosure about Offsetting Assets and Liabilities” and ASU 2013-01, “Clarifying the Scope of Disclosures about Offsetting Assets and Liabilities.” ASU 2011-11 created a new disclosure requirement about the nature of an entity’s rights to setoff and the related arrangements associated with its financial instruments and derivative instruments, while ASU 2013-01 clarified the types of instruments and transactions that are subject to the offsetting disclosure requirements established by ASU 2011-11. Entities are required to disclose both gross information and net information about both instruments and transactions eligible for offset in the statement of financial position and instruments and transactions subject to an agreement similar to a master netting arrangement. The objective of these disclosures is to facilitate comparison between those entities that prepare their financial statements on the basis of GAAP and those entities that prepare their financial statements on the basis of International Financial Reporting Standards. The new guidance did not have a significant impact on the Partnership’s financial statements.
	There were no direct investments at September 30, 2014.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	4. Fair Value Measurements:
	Partnership’s and the Master’s Investments. All commodity interests held by the Partnership and the Master (including derivative financial instruments and derivative commodity instruments) are held for trading purposes. The commodity interests are recorded on trade date and open contracts are recorded at fair value (as described below) 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 Statements of Financial Condition. Net realized gains or losses and any change in net unrealized gain or loss from the preceding period are reported in the Statements of Income and Expenses and Changes in Partners’ Capital.
	Partnership’s and the 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. Management has concluded that based on available information in the marketplace, the Master’s Level 1 assets and liabilities are actively traded.
	GAAP also requires the use of judgment in determining if a formerly active market has become inactive and in determining fair values when the market has become inactive. The General Partner has concluded that based on available information in the marketplace, there has not been a significant decrease in the volume and level of activity in the Partnership’s Level 2 assets and liabilities.
	The Partnership and the Master will separately present purchases, subscriptions, issuances, and settlements in its reconciliation of Level 3 fair value measurements (i.e., to present such items on a gross basis rather than on a net basis), and make disclosures regarding the level of disaggregation as well as the inputs and valuation techniques used to measure fair value for measurements that fall within either Level 2 or Level 3 of the fair value hierarchy as required under GAAP.
	On October 1, 2012, the Financial Accounting Standards Board (the “FASB”) issued ASU 2012-04, “Technical Corrections and Improvements,” which makes minor technical corrections and clarifications to ASC 820, “Fair Value Measurements and Disclosures.” When the FASB issued Statement 157 (codified in ASC 820), it conformed the use of the term “fair value” in certain pre-Codification standards but not others. ASU 2012-04 conforms the term’s use throughout the ASC “to fully reflect the fair value measurement and disclosure requirements” of ASC 820. ASU 2012-04 also amends the requirements that must be met for an investment company to qualify for the exemption from presenting a statement of cash flows. Specifically, it eliminates the requirements that substantially all of an entity’s investments be carried at “market value” and that the investments be highly liquid. Instead, it requires substantially all of the entity’s investments to be carried at “fair value” and classified as Level 1 or Level 2 measurements under ASC 820.
	The Partnership values its investment in the Master with no rights or obligations inherent within the ownership interest held by the Partnership based on the end of the day net asset value of the Master (Level 2). The value of the Partnership’s investment in the Master reflects its proportional interest in the Master. As of and for the periods ended September 30, 2014 and December 31, 2013, the Partnership did not hold any derivative instruments that were based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) or priced at fair value using unobservable inputs through the application of the General Partner’s assumptions and internal valuation pricing models (Level 3). During the nine months ended September 30, 2014 and twelve months ended December 31, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2.
		September 30, 2014		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable
				Identical Assets		(Level 2)		Inputs
				and Liabilities				(Level 3)
				(Level 1)
	Assets
	Investment in Master	$	223,335,014	$	—	$	223,335,014	$	—
	Net fair value	$	223,335,014	$	—	$	223,335,014	$	—
		December 31, 2013		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable
				Identical Assets		(Level 2)		Inputs
				and Liabilities				(Level 3)
				(Level 1)
	Assets
	Investment in Master	$	266,266,592	$	—	$	266,266,592	$	—
	Net fair value	$	266,266,592	$	—	$	266,266,592	$	—

Investment_in_Master

Investment in Master	9 Months Ended
	Sep. 30, 2014
Schedule of Investments [Abstract]	'
Investment in Master	'
	5. Investment in Master:
	Effective February 1, 2013, all trading decisions for the Partnership are made by Aventis, as Aventis replaced SandRidge Capital, L.P. (“SandRidge”) as the Partnership’s sole trading advisor. References to the “Advisor” herein refer to SandRidge and/or Aventis, as applicable. SandRidge Partners L.P. was a special limited partner (the “Special Limited Partner”) of the Partnership and received a quarterly profit share allocation to its capital account in the Partnership in the form of units, the value of which was equal to 20% of new trading profits earned on behalf of the Partnership during each calendar quarter. Aventis is not a special limited partner and does not receive a profit share allocation. Instead, effective February 1, 2013, the Partnership pays Aventis an incentive fee, payable quarterly, equal to 20% of new trading profits, earned by Aventis for the Partnership during each calendar quarter.
	On December 1, 2005, the Partnership allocated substantially all of its capital to CMF SandRidge Master Fund L.P. (“SandRidge Master”), a limited partnership organized under the partnership laws of the State of New York. The Partnership purchased 14,410.6191 units of SandRidge Master with cash equal to $14,477,858 and a contribution of open commodity futures and option contracts with a fair value of $(16,018). SandRidge Master permitted accounts managed by SandRidge using its Energy Program, a proprietary, discretionary trading system, to invest together in one trading vehicle. On January 31, 2013, the Partnership fully redeemed its investment in SandRidge Master for cash equal to $280,445,995.
	On February 1, 2013, the Partnership allocated substantially all of its capital to MB Master, a limited partnership organized under the partnership laws of the State of Delaware. The Partnership purchased an interest in MB Master with cash equal to $262,944,186. MB Master permits accounts managed by Aventis using its Aventis Diversified Commodity Strategy, a proprietary, discretionary trading system, to invest together in one trading vehicle. References to the “Master” herein refer to SandRidge Master and/or MB Master, as applicable. 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 structure should promote efficiency and economy in the trading process. Expenses to investors as a result of the investment in the Master are approximately the same as if the Partnership traded directly and redemption rights are not affected.
	The General Partner is not aware of any material changes to Aventis Diversified Commodity Strategy during the fiscal quarter ended September 30, 2014.
	For the period January 1, 2013 to January 31, 2013, all trading was conducted through SandRidge Master. For the period February 1, 2013 to September 30, 2014, all trading was conducted through MB Master.
	MB Master’s trading of futures, forwards, swap and option contracts, if applicable, on commodities is done primarily on U.S. commodity exchanges and foreign commodity exchanges. During the nine months ended September 30, 2014, the Master engaged in such trading through a commodity brokerage account maintained with MS&Co. During prior periods included in this report, the Master also engaged in such trading through commodity brokerage accounts maintained with CGM.
	A limited partner may withdraw all or part of these capital contributions and undistributed profits, if any, from the Master as of the end of any day. Such withdrawals are classified as a liability when the limited partner elects to redeem and informs the Master.
	Management and incentive fees are charged at the Partnership level. All trading, exchange, clearing, user, give-up, floor brokerage, and National Futures Association fees (collectively, the “clearing fees”) are borne by the Master and allocated to its limited partners, including the Partnership. All other fees are charged at the Partnership level.
	At September 30, 2014, the Partnership owned approximately 87.6% of MB Master. At December 31, 2013, the Partnership owned approximately 85.4% of MB Master. It is the Partnership’s intention to continue to invest substantially all of its assets in the Master. The performance of the Partnership is directly affected by the performance of the Master. The Master’s Statements of Financial Condition, Condensed Schedules of Investments and Statements of Income and Expenses and Changes in Partners’ Capital are included herein.
	MB Master’s Statements of Financial Condition and Condensed Schedules of Investments as of September 30, 2014 and December 31, 2013 and Statements of Income and Expenses and Changes in Partners’ Capital for the three and nine months ended September 30, 2014 and 2013 are presented below.
	MB Master Fund L.P.
	Statements of Financial Condition
			(Unaudited)			December 31,
			September  30,			2013
			2014
	Assets:
	Equity in trading account:
	Cash		$	244,361,030		$	289,817,482
	Cash margin			11,084,840			9,568,502
	Net unrealized appreciation on open futures contracts			90,399			1,893,970
	Options purchased, at fair value (cost $21,278,465 and $25,232,613 at September 30, 2014 and December 31, 2013, respectively)			19,707,117			26,469,973
	Total trading equity
				275,243,386			327,749,927
	Expense reimbursement			5,365			5,366
	Total assets
			$	275,248,751		$	327,755,293
	Liabilities and Partners’ Capital:
	Liabilities:
	Options premium received, at fair value (premium $21,398,829 and $15,985,360 at September 30, 2014 and December 31, 2013, respectively)		$	20,096,179		$	15,827,487
	Accrued expenses:
	Clearing fees due to MS&Co.			54,891			57,465
	Professional fees			52,466			39,704
	Total liabilities
				20,203,536			15,924,656
	Partners’ Capital:
	General Partner			—			—
	Limited Partners			255,045,215			311,830,637
	Total liabilities and partners’ capital		$	275,248,751		$	327,755,293
	MB Master Fund L.P.
	Condensed Schedule of Investments
	30-Sep-14
	(Unaudited)
			Number of			Fair			% of Partners’
			Contracts			Value			Capital
	Futures Contracts Purchased
	Energy			1,090			(1,539,973	)		(0.61	)%
	Grains			2,748			(6,551,815	)		(2.57	)
	Softs			1,049			247,005			0.1
	Total futures contracts purchased						(7,844,783	)		(3.08	)
	Futures Contracts Sold
	Energy			709			1,504,264			0.59
	Grains			1,829			6,509,795			2.55
	Softs			409			(78,877	)		(0.03	)
	Total futures contracts sold						7,935,182			3.11
	Net unrealized appreciation on open futures contracts						90,399			0.03
	Options Purchased
	Calls
	Energy			504			296,352			0.12
	Grains			2,512			2,913,669			1.14
	Livestock			255			346,800			0.14
	Softs			5,657			8,653,524			3.39
	Puts
Grains			4,660			6,025,619			2.36
Livestock			1,540			546,060			0.22
Softs			784			925,093			0.36
Total options purchased						19,707,117			7.73
Options Premium Received
Calls
Energy			504			(65,621	)		(0.03	)
Grains			2,550			(4,140,494	)		(1.62	)
Livestock			351			(1,013,700	)		(0.40	)
Softs			5,468			(5,260,967	)		(2.06	)
Puts
Energy			252			(466,200	)		(0.18	)
Grains			4,962			(8,942,575	)		(3.51	)
Livestock			332			(1,660	)		(0.00	)*
Softs			366			(204,962	)		(0.08	)
Total options premium received						(20,096,179	)		(7.88	)
Net fair value					$	(298,663	)		(0.12	)%
* Due to rounding
MB Master Fund L.P.
Condensed Schedule of Investments
December 31, 2013
		Number of			Fair Value			% of Partners’
		Contracts						Capital
Futures Contracts Purchased
Energy			1,375		$	(401,760	)		(0.13	)%
Grains			2,424			(1,457,458	)		(0.47	)
Livestock			1,665			199,989			0.07
Metals			141			18,525			0.01
Softs			1,578			(255,800	)		(0.08	)
Total futures contracts purchased						(1,896,504	)		(0.60	)
Futures Contracts Sold
Energy			1,565			1,171,770			0.38
Grains			3,531			2,310,303			0.74
Livestock			1,246			(207,888	)		(0.07	)
Metals			74			(19,690	)		(0.01	)
Softs			785			535,979			0.17
Total futures contracts sold						3,790,474			1.21
Net unrealized appreciation on open futures contracts						1,893,970			0.61
Options Purchased
Calls
Energy			615			546,702			0.18
Grains			758			1,505,487			0.48
Metals			551			409,830			0.13
Softs			5,211			1,673,305			0.54
Puts
Energy			916			1,163,320			0.37
Grains			24,482			18,216,311			5.84
Livestock			741			781,760			0.25
Metals			497			984,560			0.32
Softs			2,995			1,188,698			0.38
Total options purchased						26,469,973			8.49
Options Premium Received
Calls
Grains			662			(2,407,269	)		(0.77	)
Metals			1,023			(351,340	)		(0.11	)
Softs			6,276			(431,738	)		(0.14	)
Puts
Grains			26,358			(12,331,819	)		(3.96	)
Metals			76			(104,880	)		(0.03	)
Softs			1,122			(200,441	)		(0.07	)
Total options premium received						(15,827,487	)		(5.08	)
Net fair value					$	12,536,456			4.02	%
MB Master Fund L.P.
Statements of Income and Expenses and Changes in Partners’ Capital
(Unaudited)
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
Investment Income:
Interest income		$	6,660		$	13,014		$	34,166		$	64,284
Expenses:
Clearing fees			1,193,921			1,516,762			3,833,324			3,415,498
Professional fees			24,418			35,466			79,484			78,565
Total expenses			1,218,339			1,552,228			3,912,808			3,494,063
Expense reimbursements			(14,265	)		(26,743	)		(42,487	)		(80,964	)
Net expenses			1,204,074			1,525,485			3,870,321			3,413,099
Net investment income (loss)			(1,197,414	)		(1,512,471	)		(3,836,155	)		(3,348,815	)
Trading results:
Net gains (losses) on trading of commodity interests:
Net realized gains (losses) on closed contracts			12,412,338			837,823			16,956,772			2,242,257
Change in net unrealized gains (losses) on open contracts			880,046			6,012,650			(3,467,502	)		1,822,222
Total trading results			13,292,384			6,850,473			13,489,270			4,064,479
Net income (loss)			12,094,970			5,338,002			9,653,115			715,664
Subscriptions — Limited Partners			1,661,365			11,874,279			9,181,027			325,995,093
Redemptions — Limited Partners			(17,194,012	)		(26,435,515	)		(75,585,398	)		(72,244,197	)
Distribution of interest income to feeder funds			(6,660	)		(13,014	)		(34,166	)		(64,284	)
Net increase (decrease) in Partners’ Capital			(3,444,337	)		(9,236,248	)		(56,785,422	)		254,402,276
Partners’ Capital, beginning of period			258,489,552			329,531,679			311,830,637			65,893,155
Partners’ Capital, end of period		$	255,045,215		$	320,295,431		$	255,045,215		$	320,295,431
The following tables summarize the valuation of the Master’s investments as of September 30, 2014 and December 31, 2013, respectively.
											Gross Amounts not Offset
											in the Statement of
											Financial Condition
30-Sep-14		Gross Amounts			Gross Amounts Offset			Net Amounts Presented			Financial			Cash		Net Amount
		Recognized			in the Statement of			in the Statement of			Instruments			Collateral
					Financial Condition			Financial Condition						Received
Assets
Futures		$	8,763,524		$	(8,673,125	)	$	90,399		$	—		$	—	$	90,399
Options purchased			19,707,117			—			19,707,117			(19,707,117	)		—		—
Total assets			28,470,641			(8,673,125	)		19,797,516			(19,707,117	)		—		90,399
Liabilities
Futures		$	(8,673,125	)	$	8,673,125		$	—		$	—		$	—	$	—
Options premium received			(20,096,179	)		—			(20,096,179	)		19,707,117			—		(389,062	)
Total liabilities			(28,769,304	)		8,673,125			(20,096,179	)		19,707,117			—		(389,062	)
Net fair value																$	(298,663	)
											Gross Amounts not Offset
											in the Statement of
											Financial Condition
31-Dec-13		Gross Amounts			Gross Amounts Offset			Amounts Presented			Financial			Cash		Net Amount
		Recognized			in the Statement of			in the Statement of			Instruments			Collateral
					Financial Condition			Financial Condition						Received
Assets
Futures		$	4,850,521		$	(2,956,551	)	$	1,893,970		$	—		$	—	$	1,893,970
Options purchased			26,469,973			—			26,469,973			(15,827,487	)		—		10,642,486
Total assets			31,320,494			(2,956,551	)		28,363,943			(15,827,487	)		—		12,536,456
Liabilities
Futures		$	(2,956,551	)	$	2,956,551		$	—		$	—		$	—	$	—
Options premium received			(15,827,487	)		—			(15,827,487	)		15,827,487			—		—
Total liabilities			(18,784,038	)		2,956,551			(15,827,487	)		15,827,487			—		—
Net fair value																$	12,536,456
The Master considers prices for exchange-traded commodity futures, forwards, swaps and option contracts to be based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1). The values of non-exchange-traded forwards, swaps and certain option 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 September 30, 2014 and December 31, 2013, the Master did not hold any derivative instruments for which market quotations are not readily available and were priced by broker-dealers that derive fair values for those assets from observable inputs (Level 2) or 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). During the nine months ended September 30, 2014 and twelve months ended December 31, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2.
		September 30, 2014			Quoted Prices in			Significant Other			Significant
					Active Markets for			Observable			Unobservable
					Identical Assets			Inputs			Inputs
					and Liabilities			(Level 2)			(Level 3)
					(Level 1)
Assets
Futures		$	8,763,524		$	8,763,524		$	—		$	—
Options purchased			19,707,117			19,707,117			—			—
Total assets		$	28,470,641		$	28,470,641		$	—		$	—
Liabilities
Futures		$	8,673,125		$	8,673,125		$	—		$	—
Options premium received			20,096,179			20,096,179			—			—
Total liabilities			28,769,304			28,769,304			—			—
Net fair value		$	(298,663	)	$	(298,663	)	$	—		$	—
		December 31, 2013			Quoted Prices in			Significant Other			Significant
					Active Markets for			Observable			Unobservable
					Identical Assets			Inputs			Inputs
					and Liabilities			(Level 2)			(Level 3)
					(Level 1)
Assets
Futures		$	4,850,521		$	4,850,521		$	—		$	—
Options purchased			26,469,973			26,469,973			—			—
Total assets		$	31,320,494		$	31,320,494		$	—		$	—
Liabilities
Futures		$	2,956,551		$	2,956,551		$	—		$	—
Options premium received			15,827,487			15,827,487			—			—
Total liabilities			18,784,038			18,784,038			—			—
Net fair value		$	12,536,456		$	12,536,456		$	—		$	—
Financial Highlights of the Master:
Ratios to average net assets for the three and nine months ended September 30, 2014 were as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
Ratios to average net assets:
Net investment income (loss)2			(1.8	)%1		(1.8	)%1		(1.9	)%1		(1.5	)%1
Operating expenses3			1.9	%1		1.9	%1		1.9	%1		1.5	%1
Total return			4.8	%		1.6	%		4.1	%		0.3	%
1	Annualized.
2	Interest income less total expenses.
3	Percentages are annualized and after expense reimbursements (equal to 0.02%, 0.03%, 0.02% and 0.04%, respectively).
The above ratios 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 each limited partner’s share of income, expenses and average net assets.
The following tables indicate the Master’s gross fair values of derivative instruments of futures and option contracts as separate assets and liabilities as of September 30, 2014 and December 31, 2013, respectively.
		September 30, 2014
Assets
Futures Contracts
Energy		$	1,631,958
Grains			6,585,897
Softs			545,669
Total unrealized appreciation on open futures contracts		$	8,763,524
Liabilities
Futures Contracts
Energy		$	(1,667,667	)
Grains			(6,627,917	)
Softs			(377,541	)
Total unrealized depreciation on open futures contracts		$	(8,673,125	)
Net unrealized appreciation on open futures contracts		$	90,399	*
Assets
Options Purchased
Energy		$	296,352
Grains			8,939,288
Livestock			892,860
Softs			9,578,617
Total options purchased		$	19,707,117	**
Liabilities
Options Premium Received
Energy		$	(531,821	)
Grains			(13,083,069	)
Livestock			(1,015,360	)
Softs			(5,465,929	)
Total options premium received		$	(20,096,179	)***
*	This amount is in “Net unrealized appreciation on open futures contracts” on the Master’s Statements of Financial Condition.
**	This amount is in “Options purchased, at fair value” on the Master’s Statements of Financial Condition.
***	This amount is in “Options premium received, at fair value” on the Master’s Statements of Financial Condition.
		December 31, 2013
Assets
Futures Contracts
Energy		$	1,359,790
Grains			2,333,747
Livestock			296,918
Metals			74,145
Softs			785,921
Total unrealized appreciation on open futures contracts		$	4,850,521
Liabilities
Futures Contracts
Energy		$	(589,780	)
Grains			(1,480,902	)
Livestock			(304,817	)
Metals			(75,310	)
Softs			(505,742	)
Total unrealized depreciation on open futures contracts		$	(2,956,551	)
Net unrealized appreciation on open futures contracts		$	1,893,970	*
Assets
Options Purchased
Energy		$	1,710,022
Grains			19,721,798
Livestock			781,760
Metals			1,394,390
Softs			2,862,003
Total options purchased		$	26,469,973	**
Liabilities
Options Premium Received
Grains		$	(14,739,088	)
Metals			(456,220	)
Softs			(632,179	)
Total options premium received		$	(15,827,487	)***
*	This amount is included in “Net unrealized appreciation on open futures contracts” on the Master’s Statements of Financial Condition.
**	This amount is included in “Options purchased, at fair value” on the Master’s Statements of Financial Condition.
***	This amount is included in “Options premium received, at fair value” on the Master’s Statements of Financial Condition.
The following table indicates the Master’s total trading gains and losses, by market sector, on derivative instruments for the three and nine months ended September 30, 2014 and 2013.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
Sector		2014			2013			2014			2013
Currencies		$	—		$	(2,484	)	$	—		$	(2,484	)
Energy			2,079,186			(5,190,937	)		(1,811,959	)		(9,697,122	)
Grains			21,561,783			10,215,677			30,000,239			14,560,401
Livestock			(118,846	)		(1,530,435	)		(3,259,954	)		(4,025,931	)
Metals			—			224,555			(70,689	)		422,380
Softs			(10,229,739	)		3,134,097			(11,368,367	)		2,807,235
Total		$	13,292,384	****	$	6,850,473	****	$	13,489,270	****	$	4,064,479	****
****	This amount is in “Total trading results” on the Master’s Statements of Income and Expenses and Changes in Partners’ Capital.

Financial_Instrument_Risks

Financial Instrument Risks	9 Months Ended
	Sep. 30, 2014
Investments, All Other Investments [Abstract]	'
Financial Instrument Risks	'
	6. Financial Instrument Risks:
	In the normal course of business, the Partnership, 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 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 at specific terms at 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, option and swap 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 accurately be 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 related 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. None of the Partnership’s/Master’s contracts are traded OTC, although contracts may be traded OTC in the future.
	The risk to the limited partners that have purchased Redeemable Units is limited to the amount of 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/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/Master is exposed to a market risk equal to the value of the 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/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/Master’s risk of loss is reduced through the use of legally enforceable master netting agreements with counterparties that permit the Partnership/Master to offset unrealized gains and losses and other assets and liabilities with such counterparties upon the occurrence of certain events. The Partnership/Master had credit risk and concentration risk during the reporting period and prior periods included in this report, as CGM and/or MS&Co. or their affiliates were the sole counterparties or brokers with respect to the Partnership’s/Master’s assets. Credit risk with respect to exchange-traded instruments was reduced to the extent that, through CGM and/or MS&Co. or their affiliates, the Partnership’s/Master’s counterparty is an exchange or clearing organization. The Partnership/Master continue to be subject to such risks with respect to MS&Co.
	SandRidge concentrated the Partnership’s/Master’s trading in energy-related markets. Concentration in a limited number of commodity interests may subject the Partnership’s/Master’s account to greater volatility than if a more diversified portfolio of contracts was traded on behalf of the Partnership/Master. Since February 1, 2013, Aventis has traded a more diversified portfolio of contracts on behalf of the Partnership/Master.
	As both a buyer and seller of options, the Partnership/Master pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option. Written options expose the Partnership/Master to potentially unlimited liability; for purchased options the risk of loss is limited to the premiums paid. Certain written put options permit cash settlement and do not require the option holder to own the reference asset. The Partnership/Master does not consider these contracts to be guarantees.
	The General Partner monitors and attempts to control the Partnership’s/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/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 and options 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/Master’s business, these instruments may not be held to maturity.

Critical_Accounting_Policies

Critical Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Critical Accounting Policies	'
	7. Critical Accounting Policies:
	Use of Estimates. The preparation of financial statements and accompanying notes in conformity with 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.
	Partnership’s and Master’s Investments. All commodity interests held by the Partnership and the Master, including derivative financial instruments and derivative commodity instruments, are held for trading purposes. The commodity interests are recorded on trade date and open contracts are recorded at fair value (as described below) 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 Statements of Financial Condition. Net realized gains or losses and any change in net unrealized gain or loss from the preceding period are reported in the Statements of Income and Expenses and Changes in Partners’ Capital.
	Partnership’s and 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 General Partner has concluded that based on available information in the marketplace, the Master’s Level 1 assets and liabilities are actively traded.
	GAAP also requires the use of judgment in determining if a formerly active market has become inactive and in determining fair values when the market has become inactive. The General Partner has concluded that based on available information in the marketplace, there has not been a significant decrease in the volume and the level of activity in the Partnership’s Level 2 assets and liabilities.
	The Partnership and the Master will separately present purchases, sales, issuances and settlements in their reconciliation of Level 3 fair value measurements (i.e., to present such items on a gross basis rather than on a net basis), and make disclosures regarding the level of disaggregation as well as the inputs and valuation techniques used to measure fair value for measurements that fall within either Level 2 or Level 3 of the fair value hierarchy as required under GAAP.
	The Partnership values its investment in the Master where there are no other rights or obligations inherent within the ownership interest held by the Partnership based on the end of the day net asset value of the Master (Level 2). The value of the Partnership’s investment in the Master reflects its proportional interest in the Master. As of and for the periods ended September 30, 2014 and December 31, 2013, the Partnership did not hold any derivative instruments that were based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) or priced at fair value using unobservable inputs through the application of the General Partner’s assumptions and internal valuation pricing models (Level 3). During the nine months ended September 30, 2014 and twelve months ended December 31, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2.
	The Master considers prices for exchange-traded commodity futures, forwards, swaps and option contracts to be based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1). The values of non-exchange-traded forwards, swaps and certain option 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 September 30, 2014 and December 31, 2013, the Master did not hold any derivative instruments for which market quotations are not readily available and were priced by broker-dealers who derive fair values for those assets from observable inputs (Level 2) or 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). During the nine months ended September 30, 2014 and twelve months ended December 31, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2.
	Futures Contracts. 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 Master’s Statements of Income and Expenses and Changes in Partners’ Capital.
	Options. The Master may purchase and write (sell), both exchange-listed and OTC options on commodities or financial instruments. An option is a contract allowing, but not requiring, its holder to buy (call) or sell (put) a specific or standard commodity or financial instrument at a specified price during a specified time period. The option premium is the total price paid or received for the option contract. When the Master writes an option, the premium received is recorded as a liability in the Master’s Statements of Financial Condition and marked to market daily. When the Master purchases an option, the premium paid is recorded as an asset in the Master’s Statements of Financial Condition and marked to market daily. Net realized gains (losses) and changes in unrealized gains (losses) on option contracts are included in the Master’s Statements of Income and Expenses and Changes in Partners’ Capital.
	Investment Company Status. Effective January 1, 2014, the Partnership adopted ASU 2013-08, “Financial Services — Investment Companies (Topic 946): Amendments to the Scope, Measurement and Disclosure Requirements.” ASU 2013-08 changes the approach to the investment company assessment, requires non-controlling ownership interests in other investment companies to be measured at fair value, and requires additional disclosures about the investment company’s status as an investment company. ASU 2013-08 is effective for interim and annual reporting periods beginning after December 15, 2013. The adoption of this ASU did not have a material impact on the Partnership’s financial statements. Based on management’s assessment, the Partnership has been deemed to be an investment company since inception. It has all of the fundamental characteristics of an investment company. Although the Partnership does not possess all of the typical characteristics of an investment company, its activities are consistent with those of an investment company.
	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 has 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 2013 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.
	Net Income (loss) per unit. Net income (loss) per unit is calculated in accordance with investment company guidance. See Note 2, “Financial Highlights.”
	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 has determined that other than as referenced in Note 1 to the financial statements, there were no subsequent events requiring adjustment of or disclosure in the financial statements.

Critical_Accounting_Policies_P

Critical Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Use of Estimates	'
	Use of Estimates. The preparation of financial statements and accompanying notes in conformity with 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.
Partnership's and the Master's Investments	'
	Partnership’s and Master’s Investments. All commodity interests held by the Partnership and the Master, including derivative financial instruments and derivative commodity instruments, are held for trading purposes. The commodity interests are recorded on trade date and open contracts are recorded at fair value (as described below) 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 Statements of Financial Condition. Net realized gains or losses and any change in net unrealized gain or loss from the preceding period are reported in the Statements of Income and Expenses and Changes in Partners’ Capital.
Partnership's and Master's Fair Value Measurements	'
	Partnership’s and 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 General Partner has concluded that based on available information in the marketplace, the Master’s Level 1 assets and liabilities are actively traded.
	GAAP also requires the use of judgment in determining if a formerly active market has become inactive and in determining fair values when the market has become inactive. The General Partner has concluded that based on available information in the marketplace, there has not been a significant decrease in the volume and the level of activity in the Partnership’s Level 2 assets and liabilities.
	The Partnership and the Master will separately present purchases, sales, issuances and settlements in their reconciliation of Level 3 fair value measurements (i.e., to present such items on a gross basis rather than on a net basis), and make disclosures regarding the level of disaggregation as well as the inputs and valuation techniques used to measure fair value for measurements that fall within either Level 2 or Level 3 of the fair value hierarchy as required under GAAP.
	The Partnership values its investment in the Master where there are no other rights or obligations inherent within the ownership interest held by the Partnership based on the end of the day net asset value of the Master (Level 2). The value of the Partnership’s investment in the Master reflects its proportional interest in the Master. As of and for the periods ended September 30, 2014 and December 31, 2013, the Partnership did not hold any derivative instruments that were based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1) or priced at fair value using unobservable inputs through the application of the General Partner’s assumptions and internal valuation pricing models (Level 3). During the nine months ended September 30, 2014 and twelve months ended December 31, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2.
	The Master considers prices for exchange-traded commodity futures, forwards, swaps and option contracts to be based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1). The values of non-exchange-traded forwards, swaps and certain option 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 September 30, 2014 and December 31, 2013, the Master did not hold any derivative instruments for which market quotations are not readily available and were priced by broker-dealers who derive fair values for those assets from observable inputs (Level 2) or 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). During the nine months ended September 30, 2014 and twelve months ended December 31, 2013, there were no transfers of assets or liabilities between Level 1 and Level 2.
Futures Contracts	'
	Futures Contracts. 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 Master’s Statements of Income and Expenses and Changes in Partners’ Capital.
Options	'
	Options. The Master may purchase and write (sell), both exchange-listed and OTC options on commodities or financial instruments. An option is a contract allowing, but not requiring, its holder to buy (call) or sell (put) a specific or standard commodity or financial instrument at a specified price during a specified time period. The option premium is the total price paid or received for the option contract. When the Master writes an option, the premium received is recorded as a liability in the Master’s Statements of Financial Condition and marked to market daily. When the Master purchases an option, the premium paid is recorded as an asset in the Master’s Statements of Financial Condition and marked to market daily. Net realized gains (losses) and changes in unrealized gains (losses) on option contracts are included in the Master’s Statements of Income and Expenses and Changes in Partners’ Capital.
Investment Company Status	'
	Investment Company Status. Effective January 1, 2014, the Partnership adopted ASU 2013-08, “Financial Services — Investment Companies (Topic 946): Amendments to the Scope, Measurement and Disclosure Requirements.” ASU 2013-08 changes the approach to the investment company assessment, requires non-controlling ownership interests in other investment companies to be measured at fair value, and requires additional disclosures about the investment company’s status as an investment company. ASU 2013-08 is effective for interim and annual reporting periods beginning after December 15, 2013. The adoption of this ASU did not have a material impact on the Partnership’s financial statements. Based on management’s assessment, the Partnership has been deemed to be an investment company since inception. It has all of the fundamental characteristics of an investment company. Although the Partnership does not possess all of the typical characteristics of an investment company, its activities are consistent with those of an investment company.
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 has 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 2013 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.
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 2, “Financial Highlights.”
Subsequent Events	'
	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 has determined that other than as referenced in Note 1 to the financial statements, there were no subsequent events requiring adjustment of or disclosure in the financial statements.

Financial_Highlights_Tables

Financial Highlights (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Changes in Net Asset Value per Unit	'
	Changes in the net asset value per unit for the three and nine months ended September 30, 2014 and 2013 were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Net realized and unrealized gains (losses)*		$	58.76		$	9.92		$	28.07		$	(38.55	)
	Interest income allocated from Master			0.03			0.06			0.17			0.32
	Expenses**			(7.19	)		(7.70	)		(21.42	)		(22.88	)
	Increase (decrease) for the period			51.6			2.28			6.82			(61.11	)
	Net asset value per unit, beginning of period			1,403.23			1,427.80			1,448.01			1,491.19
	Net asset value per unit, end of period		$	1,454.83		$	1,430.08		$	1,454.83		$	1,430.08
	*	Includes ongoing selling agent fees and clearing fees allocated from Master. Net realized and unrealized gains (losses) excluding ongoing selling agent fees and clearing fees allocated from Master for the three months ended September 30, 2014 and 2013 and for the nine months ended September 30, 2014 and 2013 were $74.53, $30.21, $79.21, and $17.35, respectively.
	**	Excludes ongoing selling agent fees and clearing fees allocated from Master and includes incentive fees/allocation to the Special Limited Partner, if any. Total expenses including ongoing selling agent fees and clearing fees allocated from Master for the three months ended September 30, 2014 and 2013 and for the nine months ended September 30, 2014 and 2013 were $(22.96), $(27.99), $(72.56), and $(78.78), respectively.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Ratios to average net assets:***
	Net investment income (loss)			(6.4	)%		(7.9	)%		(7.0	)%		(7.3	)%
	Incentive fees/allocation to Special Limited Partner			—	%		—	%		—	%		—	%
	Net investment income (loss) before incentive fees/allocation to Special Limited Partner****			(6.4	)%		(7.9	)%		(7.0	)%		(7.3	)%
	Operating expenses			6.4	%		7.9	%		7	%		7.4	%
	Incentive fees/allocation to Special Limited Partner			—	%		—	%		—	%		—	%
	Total expenses and incentive fees/allocation to Special Limited Partner			6.4	%		7.9	%		7	%		7.4	%
	Total return:
	Total return before incentive fees/allocation to Special Limited Partner			3.7	%		0.2	%		0.5	%		(4.1	)%
	Incentive fees/allocation to Special Limited Partner			—	%		—	%		—	%		—	%
	Total return after incentive fees/allocation to Special Limited Partner			3.7	%		0.2	%		0.5	%		(4.1	)%
	***	Annualized (except for incentive fees/allocation to the Special Limited Partner, if applicable).
	****	Interest income allocated from Master less total expenses (exclusive of incentive fees/allocation to the Special Limited Partner, if applicable.

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Value of Partnership's Investment in Master	'
		September 30, 2014		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable
				Identical Assets		(Level 2)		Inputs
				and Liabilities				(Level 3)
				(Level 1)
	Assets
	Investment in Master	$	223,335,014	$	—	$	223,335,014	$	—
	Net fair value	$	223,335,014	$	—	$	223,335,014	$	—
		December 31, 2013		Quoted Prices in		Significant Other		Significant
				Active Markets for		Observable Inputs		Unobservable
				Identical Assets		(Level 2)		Inputs
				and Liabilities				(Level 3)
				(Level 1)
	Assets
	Investment in Master	$	266,266,592	$	—	$	266,266,592	$	—
	Net fair value	$	266,266,592	$	—	$	266,266,592	$	—

Investment_in_Master_Tables

Investment in Master (Tables)	9 Months Ended
	Sep. 30, 2014
Schedule of Investments [Abstract]	'
Statements of Financial Condition	'
	MB Master Fund L.P.
	Statements of Financial Condition
			(Unaudited)			December 31,
			September  30,			2013
			2014
	Assets:
	Equity in trading account:
	Cash		$	244,361,030		$	289,817,482
	Cash margin			11,084,840			9,568,502
	Net unrealized appreciation on open futures contracts			90,399			1,893,970
	Options purchased, at fair value (cost $21,278,465 and $25,232,613 at September 30, 2014 and December 31, 2013, respectively)			19,707,117			26,469,973
	Total trading equity
				275,243,386			327,749,927
	Expense reimbursement			5,365			5,366
	Total assets
			$	275,248,751		$	327,755,293
	Liabilities and Partners’ Capital:
	Liabilities:
	Options premium received, at fair value (premium $21,398,829 and $15,985,360 at September 30, 2014 and December 31, 2013, respectively)		$	20,096,179		$	15,827,487
	Accrued expenses:
	Clearing fees due to MS&Co.			54,891			57,465
	Professional fees			52,466			39,704
	Total liabilities
				20,203,536			15,924,656
	Partners’ Capital:
	General Partner			—			—
	Limited Partners			255,045,215			311,830,637
	Total liabilities and partners’ capital		$	275,248,751		$	327,755,293
Condensed Schedule of Investments	'
	MB Master Fund L.P.
	Condensed Schedule of Investments
	30-Sep-14
	(Unaudited)
			Number of			Fair			% of Partners’
			Contracts			Value			Capital
	Futures Contracts Purchased
	Energy			1,090			(1,539,973	)		(0.61	)%
	Grains			2,748			(6,551,815	)		(2.57	)
	Softs			1,049			247,005			0.1
	Total futures contracts purchased						(7,844,783	)		(3.08	)
	Futures Contracts Sold
	Energy			709			1,504,264			0.59
	Grains			1,829			6,509,795			2.55
	Softs			409			(78,877	)		(0.03	)
	Total futures contracts sold						7,935,182			3.11
	Net unrealized appreciation on open futures contracts						90,399			0.03
	Options Purchased
	Calls
	Energy			504			296,352			0.12
	Grains			2,512			2,913,669			1.14
	Livestock			255			346,800			0.14
	Softs			5,657			8,653,524			3.39
	Puts
	Grains			4,660			6,025,619			2.36
	Livestock			1,540			546,060			0.22
	Softs			784			925,093			0.36
	Total options purchased						19,707,117			7.73
	Options Premium Received
	Calls
	Energy			504			(65,621	)		(0.03	)
	Grains			2,550			(4,140,494	)		(1.62	)
	Livestock			351			(1,013,700	)		(0.40	)
	Softs			5,468			(5,260,967	)		(2.06	)
	Puts
	Energy			252			(466,200	)		(0.18	)
	Grains			4,962			(8,942,575	)		(3.51	)
	Livestock			332			(1,660	)		(0.00	)*
	Softs			366			(204,962	)		(0.08	)
	Total options premium received						(20,096,179	)		(7.88	)
	Net fair value					$	(298,663	)		(0.12	)%
	* Due to rounding
	MB Master Fund L.P.
	Condensed Schedule of Investments
	December 31, 2013
			Number of			Fair Value			% of Partners’
			Contracts						Capital
	Futures Contracts Purchased
	Energy			1,375		$	(401,760	)		(0.13	)%
	Grains			2,424			(1,457,458	)		(0.47	)
	Livestock			1,665			199,989			0.07
	Metals			141			18,525			0.01
	Softs			1,578			(255,800	)		(0.08	)
	Total futures contracts purchased						(1,896,504	)		(0.60	)
	Futures Contracts Sold
	Energy			1,565			1,171,770			0.38
	Grains			3,531			2,310,303			0.74
	Livestock			1,246			(207,888	)		(0.07	)
	Metals			74			(19,690	)		(0.01	)
	Softs			785			535,979			0.17
	Total futures contracts sold						3,790,474			1.21
	Net unrealized appreciation on open futures contracts						1,893,970			0.61
	Options Purchased
Calls
Energy			615			546,702			0.18
Grains			758			1,505,487			0.48
Metals			551			409,830			0.13
Softs			5,211			1,673,305			0.54
Puts
Energy			916			1,163,320			0.37
Grains			24,482			18,216,311			5.84
Livestock			741			781,760			0.25
Metals			497			984,560			0.32
Softs			2,995			1,188,698			0.38
Total options purchased						26,469,973			8.49
Options Premium Received
Calls
Grains			662			(2,407,269	)		(0.77	)
Metals			1,023			(351,340	)		(0.11	)
Softs			6,276			(431,738	)		(0.14	)
Puts
Grains			26,358			(12,331,819	)		(3.96	)
Metals			76			(104,880	)		(0.03	)
Softs			1,122			(200,441	)		(0.07	)
Total options premium received						(15,827,487	)		(5.08	)
Net fair value					$	12,536,456			4.02	%
Statements of Income and Expenses and Changes in Partners' Capital	'
	MB Master Fund L.P.
	Statements of Income and Expenses and Changes in Partners’ Capital
	(Unaudited)
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Investment Income:
	Interest income		$	6,660		$	13,014		$	34,166		$	64,284
	Expenses:
	Clearing fees			1,193,921			1,516,762			3,833,324			3,415,498
	Professional fees			24,418			35,466			79,484			78,565
	Total expenses			1,218,339			1,552,228			3,912,808			3,494,063
	Expense reimbursements			(14,265	)		(26,743	)		(42,487	)		(80,964	)
	Net expenses			1,204,074			1,525,485			3,870,321			3,413,099
	Net investment income (loss)			(1,197,414	)		(1,512,471	)		(3,836,155	)		(3,348,815	)
	Trading results:
	Net gains (losses) on trading of commodity interests:
	Net realized gains (losses) on closed contracts			12,412,338			837,823			16,956,772			2,242,257
	Change in net unrealized gains (losses) on open contracts			880,046			6,012,650			(3,467,502	)		1,822,222
	Total trading results			13,292,384			6,850,473			13,489,270			4,064,479
	Net income (loss)			12,094,970			5,338,002			9,653,115			715,664
	Subscriptions — Limited Partners			1,661,365			11,874,279			9,181,027			325,995,093
	Redemptions — Limited Partners			(17,194,012	)		(26,435,515	)		(75,585,398	)		(72,244,197	)
	Distribution of interest income to feeder funds			(6,660	)		(13,014	)		(34,166	)		(64,284	)
	Net increase (decrease) in Partners’ Capital			(3,444,337	)		(9,236,248	)		(56,785,422	)		254,402,276
	Partners’ Capital, beginning of period			258,489,552			329,531,679			311,830,637			65,893,155
	Partners’ Capital, end of period		$	255,045,215		$	320,295,431		$	255,045,215		$	320,295,431
Summary of Valuation of Master's Investments	'
	The following tables summarize the valuation of the Master’s investments as of September 30, 2014 and December 31, 2013, respectively.
												Gross Amounts not Offset
												in the Statement of
												Financial Condition
	30-Sep-14		Gross Amounts			Gross Amounts Offset			Net Amounts Presented			Financial			Cash		Net Amount
			Recognized			in the Statement of			in the Statement of			Instruments			Collateral
						Financial Condition			Financial Condition						Received
	Assets
	Futures		$	8,763,524		$	(8,673,125	)	$	90,399		$	—		$	—	$	90,399
	Options purchased			19,707,117			—			19,707,117			(19,707,117	)		—		—
	Total assets			28,470,641			(8,673,125	)		19,797,516			(19,707,117	)		—		90,399
	Liabilities
	Futures		$	(8,673,125	)	$	8,673,125		$	—		$	—		$	—	$	—
	Options premium received			(20,096,179	)		—			(20,096,179	)		19,707,117			—		(389,062	)
	Total liabilities			(28,769,304	)		8,673,125			(20,096,179	)		19,707,117			—		(389,062	)
	Net fair value																$	(298,663	)
												Gross Amounts not Offset
												in the Statement of
												Financial Condition
	31-Dec-13		Gross Amounts			Gross Amounts Offset			Amounts Presented			Financial			Cash		Net Amount
			Recognized			in the Statement of			in the Statement of			Instruments			Collateral
						Financial Condition			Financial Condition						Received
	Assets
	Futures		$	4,850,521		$	(2,956,551	)	$	1,893,970		$	—		$	—	$	1,893,970
	Options purchased			26,469,973			—			26,469,973			(15,827,487	)		—		10,642,486
	Total assets			31,320,494			(2,956,551	)		28,363,943			(15,827,487	)		—		12,536,456
	Liabilities
	Futures		$	(2,956,551	)	$	2,956,551		$	—		$	—		$	—	$	—
	Options premium received			(15,827,487	)		—			(15,827,487	)		15,827,487			—		—
	Total liabilities			(18,784,038	)		2,956,551			(15,827,487	)		15,827,487			—		—
	Net fair value																$	12,536,456
Derivative Instruments, Fair Value Based on Hierarchy	'
			September 30, 2014			Quoted Prices in			Significant Other			Significant
						Active Markets for			Observable			Unobservable
						Identical Assets			Inputs			Inputs
						and Liabilities			(Level 2)			(Level 3)
						(Level 1)
	Assets
	Futures		$	8,763,524		$	8,763,524		$	—		$	—
	Options purchased			19,707,117			19,707,117			—			—
	Total assets		$	28,470,641		$	28,470,641		$	—		$	—
	Liabilities
	Futures		$	8,673,125		$	8,673,125		$	—		$	—
	Options premium received			20,096,179			20,096,179			—			—
	Total liabilities			28,769,304			28,769,304			—			—
	Net fair value		$	(298,663	)	$	(298,663	)	$	—		$	—
			December 31, 2013			Quoted Prices in			Significant Other			Significant
						Active Markets for			Observable			Unobservable
						Identical Assets			Inputs			Inputs
						and Liabilities			(Level 2)			(Level 3)
						(Level 1)
	Assets
	Futures		$	4,850,521		$	4,850,521		$	—		$	—
	Options purchased			26,469,973			26,469,973			—			—
	Total assets		$	31,320,494		$	31,320,494		$	—		$	—
	Liabilities
	Futures		$	2,956,551		$	2,956,551		$	—		$	—
	Options premium received			15,827,487			15,827,487			—			—
	Total liabilities			18,784,038			18,784,038			—			—
	Net fair value		$	12,536,456		$	12,536,456		$	—		$	—
Changes in Net Asset Value Per Unit for Individual Investors	'
	Financial Highlights of the Master:
	Ratios to average net assets for the three and nine months ended September 30, 2014 were as follows:
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
	Ratios to average net assets:
	Net investment income (loss)2			(1.8	)%1		(1.8	)%1		(1.9	)%1		(1.5	)%1
	Operating expenses3			1.9	%1		1.9	%1		1.9	%1		1.5	%1
	Total return			4.8	%		1.6	%		4.1	%		0.3	%
	1	Annualized.
	2	Interest income less total expenses.
	3	Percentages are annualized and after expense reimbursements (equal to 0.02%, 0.03%, 0.02% and 0.04%, respectively).
Gross Fair Values of Derivative Instruments of Futures and Options Contracts	'
	The following tables indicate the Master’s gross fair values of derivative instruments of futures and option contracts as separate assets and liabilities as of September 30, 2014 and December 31, 2013, respectively.
			September 30, 2014
	Assets
	Futures Contracts
	Energy		$	1,631,958
	Grains			6,585,897
	Softs			545,669
	Total unrealized appreciation on open futures contracts		$	8,763,524
	Liabilities
	Futures Contracts
	Energy		$	(1,667,667	)
	Grains			(6,627,917	)
	Softs			(377,541	)
	Total unrealized depreciation on open futures contracts		$	(8,673,125	)
	Net unrealized appreciation on open futures contracts		$	90,399	*
	Assets
	Options Purchased
	Energy		$	296,352
	Grains			8,939,288
	Livestock			892,860
	Softs			9,578,617
	Total options purchased		$	19,707,117	**
	Liabilities
	Options Premium Received
	Energy		$	(531,821	)
	Grains			(13,083,069	)
	Livestock			(1,015,360	)
	Softs			(5,465,929	)
	Total options premium received		$	(20,096,179	)***
	*	This amount is in “Net unrealized appreciation on open futures contracts” on the Master’s Statements of Financial Condition.
	**	This amount is in “Options purchased, at fair value” on the Master’s Statements of Financial Condition.
	***	This amount is in “Options premium received, at fair value” on the Master’s Statements of Financial Condition.
			December 31, 2013
	Assets
	Futures Contracts
	Energy		$	1,359,790
	Grains			2,333,747
	Livestock			296,918
	Metals			74,145
	Softs			785,921
	Total unrealized appreciation on open futures contracts		$	4,850,521
	Liabilities
	Futures Contracts
	Energy		$	(589,780	)
	Grains			(1,480,902	)
	Livestock			(304,817	)
	Metals			(75,310	)
	Softs			(505,742	)
	Total unrealized depreciation on open futures contracts		$	(2,956,551	)
	Net unrealized appreciation on open futures contracts		$	1,893,970	*
	Assets
	Options Purchased
	Energy		$	1,710,022
	Grains			19,721,798
	Livestock			781,760
	Metals			1,394,390
	Softs			2,862,003
	Total options purchased		$	26,469,973	**
	Liabilities
	Options Premium Received
	Grains		$	(14,739,088	)
	Metals			(456,220	)
	Softs			(632,179	)
Total options premium received		$	(15,827,487	)***
*	This amount is included in “Net unrealized appreciation on open futures contracts” on the Master’s Statements of Financial Condition.
**	This amount is included in “Options purchased, at fair value” on the Master’s Statements of Financial Condition.
***	This amount is included in “Options premium received, at fair value” on the Master’s Statements of Financial Condition.
Trading Gains and Losses by Market Sector on Derivative Instruments	'
	The following table indicates the Master’s total trading gains and losses, by market sector, on derivative instruments for the three and nine months ended September 30, 2014 and 2013.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
	Sector		2014			2013			2014			2013
	Currencies		$	—		$	(2,484	)	$	—		$	(2,484	)
	Energy			2,079,186			(5,190,937	)		(1,811,959	)		(9,697,122	)
	Grains			21,561,783			10,215,677			30,000,239			14,560,401
	Livestock			(118,846	)		(1,530,435	)		(3,259,954	)		(4,025,931	)
	Metals			—			224,555			(70,689	)		422,380
	Softs			(10,229,739	)		3,134,097			(11,368,367	)		2,807,235
	Total		$	13,292,384	****	$	6,850,473	****	$	13,489,270	****	$	4,064,479	****
	****	This amount is in “Total trading results” on the Master’s Statements of Income and Expenses and Changes in Partners’ Capital.

General_Additional_Information

General - Additional Information (Detail)	0 Months Ended	9 Months Ended	0 Months Ended		9 Months Ended
	Sep. 06, 2005	Sep. 30, 2014	Mar. 01, 2014	Mar. 01, 2014	Sep. 30, 2014	Sep. 30, 2014
			Maximum [Member]	Minimum [Member]	April 1, 2014 [Member]	Effective October 1, 2014 [Member]
Related Party Transaction [Line Items]	'	'	'	'	'	'
Number of units sold during initial offering period	11,925	'	'	'	'	'
Percentage of management fee paid	'	'	1.50%	1.25%	'	'
Per year brokerage fee	'	3.75%	'	'	2.50%	2.00%
Annual rate of administrative fee	'	'	'	'	'	1.00%
Percentage of administrative fee increased	'	'	'	'	'	0.50%

Financial_Highlights_Changes_i

Financial Highlights - Changes in Net Asset Value per Unit (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Partners' Capital [Abstract]	'	'	'	'
Net realized and unrealized gains (losses)	58.76	9.92	28.07	-38.55
Interest income allocated from Master	0.03	0.06	0.17	0.32
Expenses	-7.19	-7.7	-21.42	-22.88
Increase (decrease) for the period	51.6	2.28	6.82	-61.11
Net asset value per unit, beginning of period	1,403.23	1,427.80	1,448.01	1,491.19
Net asset value per unit, end of period	1,454.83	1,430.08	1,454.83	1,430.08
Ratios to average net assets:	'	'	'	'
Net investment income (loss)	-6.40%	-7.90%	-7.00%	-7.30%
Incentive fees/allocation to Special Limited Partner	'	'	'	'
Net investment income (loss) before incentive fees/allocation to Special Limited Partner	-6.40%	-7.90%	-7.00%	-7.30%
Operating expenses	6.40%	7.90%	7.00%	7.40%
Incentive fees/allocation to Special Limited Partner	'	'	'	'
Total expenses and incentive fees/allocation to Special Limited Partner	6.40%	7.90%	7.00%	7.40%
Total return:	'	'	'	'
Total return before incentive fees/allocation to Special Limited Partner	3.70%	0.20%	0.50%	-4.10%
Incentive fees/allocation to Special Limited Partner	'	'	'	'
Total return after incentive fees/allocation to Special Limited Partner	3.70%	0.20%	0.50%	-4.10%

Financial_Highlights_Changes_i1

Financial Highlights - Changes in Net Asset Value per Unit (Parenthetical) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Partners' Capital [Abstract]	'	'	'	'
Net realized and unrealized gains (losses) excluding ongoing selling agent fees and clearing fees	74.53	30.21	79.21	17.35
Total expenses including ongoing selling agent fees and clearing fees	-22.96	-27.99	-72.56	-78.78

Trading_Activities_Additional_

Trading Activities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]	'	'	'	'
Average number of futures traded	10,669	10,847	13,140	8,283
Average number of options contracts traded	41,463	68,656	65,060	92,604
Forward contracts [Member]	'	'	'	'
Derivative [Line Items]	'	'	'	'
Average notional values of currency forward contracts held by the Master	0	473,623	0	157,874

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'	'
Transfers of assets or liabilities between Level 1 and Level 2	$0	$0

Fair_Value_Measurements_Value_

Fair Value Measurements - Value of Partnership's Investment in Master (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investment in Master	$223,335,014	$266,266,592
Net fair value	223,335,014	266,266,592
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investment in Master	'	'
Net fair value	'	'
Significant Other Observable Inputs (Level 2) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investment in Master	223,335,014	266,266,592
Net fair value	223,335,014	266,266,592
Significant Unobservable Inputs (Level 3) [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investment in Master	'	'
Net fair value	'	'

Investment_in_Master_Additiona

Investment in Master - Additional Information (Detail) (USD $)	9 Months Ended			12 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Feb. 01, 2013	Jan. 31, 2013	Dec. 01, 2005
	SandRidge Partners L.P. [Member]	Managed Futures Premier Aventis II L.P. [Member]	MB Master Fund L.P. [Member]	MB Master Fund L.P. [Member]	MB Master Fund L.P. [Member]	CMF SandRidge Master Fund L.P. [Member]	CMF SandRidge Master Fund L.P. [Member]
Related Party Transaction [Line Items]	'	'	'	'	'	'	'
Profit share allocation percentage on new trading profits	20.00%	'	'	'	'	'	'
Incentive fee percentage	'	20.00%	'	'	'	'	'
Units of Partnership purchased	'	'	'	'	'	'	14,410.62
Cash value, Partnership purchased	'	'	'	'	$262,944,186	'	$14,477,858
Fair value, Partnership purchased	'	'	'	'	'	'	-16,018
Redemption value	'	'	'	'	'	$280,445,995	'
Percentage of Partnership owned	'	'	87.60%	85.40%	'	'	'

Investment_in_Master_Statement

Investment in Master - Statements of Financial Condition (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Equity in trading account:	'	'
Cash	$111,065	$29,913
Net unrealized appreciation on open futures contracts	90,399	1,893,970
Total assets	223,446,079	266,296,505
Accrued expenses:	'	'
Total liabilities	4,466,000	6,573,203
Partners' Capital:	'	'
Limited Partners	216,581,876	256,684,632
Total liabilities and partners' capital	223,446,079	266,296,505
MB Master Fund L.P. [Member]	'	'
Equity in trading account:	'	'
Cash	244,361,030	289,817,482
Cash margin	11,084,840	9,568,502
Net unrealized appreciation on open futures contracts	90,399	1,893,970
Options purchased, at fair value (cost $21,278,465 and $25,232,613 at September 30, 2014 and December 31, 2013, respectively)	19,707,117	26,469,973
Total trading equity	275,243,386	327,749,927
Expense reimbursement	5,365	5,366
Total assets	275,248,751	327,755,293
Liabilities:	'	'
Options premium received, at fair value (premium $21,398,829 and $15,985,360 at September 30, 2014 and December 31, 2013, respectively)	20,096,179	15,827,487
Accrued expenses:	'	'
Clearing fees due to MS&Co.	54,891	57,465
Professional fees	52,466	39,704
Total liabilities	20,203,536	15,924,656
Partners' Capital:	'	'
General Partner	0	0
Limited Partners	255,045,215	311,830,637
Total liabilities and partners' capital	$275,248,751	$327,755,293

Investment_in_Master_Statement1

Investment in Master - Statements of Financial Condition (Parenthetical) (Detail) (MB Master Fund L.P. [Member], USD $)	Sep. 30, 2014	Dec. 31, 2013
MB Master Fund L.P. [Member]	'	'
Condensed Balance Sheet Statements, Captions [Line Items]	'	'
Cost of options purchased	$21,278,465	$25,232,613
Stock option redemption premium	$21,398,829	$15,985,360

Investment_in_Master_Condensed

Investment in Master - Condensed Schedule of Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	$223,335,014	$266,266,592
MB Master Fund L.P. [Member]	'	'
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	-298,663	12,536,456
Percentage of members Capital	-0.12%	4.02%
MB Master Fund L.P. [Member] | Futures Contracts Purchased [Member]	'	'
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	-7,844,783	-1,896,504
Percentage of members Capital	-3.08%	-0.60%
MB Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Energy [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	1,090	1,375
Investment in Master, at fair value	-1,539,973	-401,760
Percentage of members Capital	-0.61%	-0.13%
MB Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Grains [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	2,748	2,424
Investment in Master, at fair value	-6,551,815	-1,457,458
Percentage of members Capital	-2.57%	-0.47%
MB Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Livestock [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	1,665
Investment in Master, at fair value	'	199,989
Percentage of members Capital	'	0.07%
MB Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Softs [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	1,049	1,578
Investment in Master, at fair value	247,005	-255,800
Percentage of members Capital	0.10%	-0.08%
MB Master Fund L.P. [Member] | Futures Contracts Purchased [Member] | Metals [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	141
Investment in Master, at fair value	'	18,525
Percentage of members Capital	'	0.01%
MB Master Fund L.P. [Member] | Futures Contracts Sold [Member]	'	'
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	7,935,182	3,790,474
Percentage of members Capital	3.11%	1.21%
MB Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Energy [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	709	1,565
Investment in Master, at fair value	1,504,264	1,171,770
Percentage of members Capital	0.59%	0.38%
MB Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Grains [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	1,829	3,531
Investment in Master, at fair value	6,509,795	2,310,303
Percentage of members Capital	2.55%	0.74%
MB Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Livestock [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	1,246
Investment in Master, at fair value	'	-207,888
Percentage of members Capital	'	-0.07%
MB Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Softs [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	409	785
Investment in Master, at fair value	-78,877	535,979
Percentage of members Capital	-0.03%	0.17%
MB Master Fund L.P. [Member] | Futures Contracts Sold [Member] | Metals [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	74
Investment in Master, at fair value	'	-19,690
Percentage of members Capital	'	-0.01%
MB Master Fund L.P. [Member] | Net Unrealized Appreciation On Open Futures Contracts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	90,399	1,893,970
Percentage of members Capital	0.03%	0.61%
MB Master Fund L.P. [Member] | Options Purchased [Member]	'	'
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	19,707,117	26,469,973
Percentage of members Capital	7.73%	8.49%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Energy [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	504	615
Investment in Master, at fair value	296,352	546,702
Percentage of members Capital	0.12%	0.18%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Energy [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	916
Investment in Master, at fair value	'	1,163,320
Percentage of members Capital	'	0.37%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Grains [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	2,512	758
Investment in Master, at fair value	2,913,669	1,505,487
Percentage of members Capital	1.14%	0.48%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Grains [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	4,660	24,482
Investment in Master, at fair value	6,025,619	18,216,311
Percentage of members Capital	2.36%	5.84%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Livestock [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	255	'
Investment in Master, at fair value	346,800	'
Percentage of members Capital	0.14%	'
MB Master Fund L.P. [Member] | Options Purchased [Member] | Livestock [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	1,540	741
Investment in Master, at fair value	546,060	781,760
Percentage of members Capital	0.22%	0.25%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Softs [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	5,657	5,211
Investment in Master, at fair value	8,653,524	1,673,305
Percentage of members Capital	3.39%	0.54%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Softs [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	784	2,995
Investment in Master, at fair value	925,093	1,188,698
Percentage of members Capital	0.36%	0.38%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Metals [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	551
Investment in Master, at fair value	'	409,830
Percentage of members Capital	'	0.13%
MB Master Fund L.P. [Member] | Options Purchased [Member] | Metals [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	497
Investment in Master, at fair value	'	984,560
Percentage of members Capital	'	0.32%
MB Master Fund L.P. [Member] | Options Premium Received [Member]	'	'
Schedule of Investments [Line Items]	'	'
Investment in Master, at fair value	-20,096,179	-15,827,487
Percentage of members Capital	-7.88%	-5.08%
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Energy [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	504	'
Investment in Master, at fair value	-65,621	'
Percentage of members Capital	-0.03%	'
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Energy [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	252	'
Investment in Master, at fair value	-466,200	'
Percentage of members Capital	-0.18%	'
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Grains [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	2,550	662
Investment in Master, at fair value	-4,140,494	-2,407,269
Percentage of members Capital	-1.62%	-0.77%
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Grains [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	4,962	26,358
Investment in Master, at fair value	-8,942,575	-12,331,819
Percentage of members Capital	-3.51%	-3.96%
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Livestock [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	351	'
Investment in Master, at fair value	-1,013,700	'
Percentage of members Capital	-0.40%	'
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Livestock [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	332	'
Investment in Master, at fair value	-1,660	'
Percentage of members Capital	0.00%	'
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Softs [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	5,468	6,276
Investment in Master, at fair value	-5,260,967	-431,738
Percentage of members Capital	-2.06%	-0.14%
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Softs [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	366	1,122
Investment in Master, at fair value	-204,962	-200,441
Percentage of members Capital	-0.08%	-0.07%
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Metals [Member] | Calls [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	1,023
Investment in Master, at fair value	'	-351,340
Percentage of members Capital	'	-0.11%
MB Master Fund L.P. [Member] | Options Premium Received [Member] | Metals [Member] | Puts [Member]	'	'
Schedule of Investments [Line Items]	'	'
Number of Contracts	'	76
Investment in Master, at fair value	'	($104,880)
Percentage of members Capital	'	-0.03%

Investment_in_Master_Statement2

Investment in Master - Statements of Income and Expenses and Changes in Partners' Capital (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Expenses:	'	'	'	'
Total expenses	$3,578,677	$5,302,097	$12,112,675	$14,544,658
Net gains (losses) on trading of commodity interests:	'	'	'	'
Net increase (decrease) in Partners' Capital	-2,738,037	-5,108,997	-40,743,223	-14,090,959
Partners' Capital, beginning of period	221,718,116	269,239,786	259,723,302	278,221,748
Partners' Capital, end of period	218,980,079	264,130,789	218,980,079	264,130,789
MB Master Fund L.P. [Member]	'	'	'	'
Investment Income:	'	'	'	'
Interest income	6,660	13,014	34,166	64,284
Expenses:	'	'	'	'
Clearing fees	1,193,921	1,516,762	3,833,324	3,415,498
Professional fees	24,418	35,466	79,484	78,565
Total expenses	1,218,339	1,552,228	3,912,808	3,494,063
Expense reimbursements	-14,265	-26,743	-42,487	-80,964
Net expenses	1,204,074	1,525,485	3,870,321	3,413,099
Net investment income (loss)	-1,197,414	-1,512,471	-3,836,155	-3,348,815
Net gains (losses) on trading of commodity interests:	'	'	'	'
Net realized gains (losses) on closed contracts	12,412,338	837,823	16,956,772	2,242,257
Change in net unrealized gains (losses) on open contracts	880,046	6,012,650	-3,467,502	1,822,222
Total trading results	13,292,384	6,850,473	13,489,270	4,064,479
Net income (loss)	12,094,970	5,338,002	9,653,115	715,664
Subscriptions - Limited Partners	1,661,365	11,874,279	9,181,027	325,995,093
Redemptions - Limited Partners	-17,194,012	-26,435,515	-75,585,398	-72,244,197
Distribution of interest income to feeder funds	-6,660	-13,014	-34,166	-64,284
Net increase (decrease) in Partners' Capital	-3,444,337	-9,236,248	-56,785,422	254,402,276
Partners' Capital, beginning of period	258,489,552	329,531,679	311,830,637	65,893,155
Partners' Capital, end of period	$255,045,215	$320,295,431	$255,045,215	$320,295,431

Investment_in_Master_Summary_o

Investment in Master - Summary of Valuation of Master's Investments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]	'	'
Net Amounts Presented in the Statement of Financial Condition, Assets	$28,470,641	$31,320,494
Gross Amounts Recognized, Liabilities	-28,769,304	-18,784,038
Options Purchased [Member]	'	'
Derivative [Line Items]	'	'
Net Amounts Presented in the Statement of Financial Condition, Assets	19,707,117	'
Options Premium Received [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Recognized, Liabilities	-20,096,179	-15,827,487
Futures [Member]	'	'
Derivative [Line Items]	'	'
Net Amounts Presented in the Statement of Financial Condition, Assets	8,763,524	4,850,521
Gross Amounts Recognized, Liabilities	-8,673,125	-2,956,551
MB Master Fund L.P. [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Recognized, Assets	28,470,641	31,320,494
Gross Amounts Offset in the Statement of Financial Condition, Assets	-8,673,125	-2,956,551
Net Amounts Presented in the Statement of Financial Condition, Assets	19,797,516	28,363,943
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Financial Instruments	-19,707,117	-15,827,487
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Cash Collateral Received	'	'
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Net Amount	90,399	12,536,456
Gross Amounts Recognized, Liabilities	-28,769,304	-18,784,038
Gross Amount Offset in the Statement of Financial Condition, Liabilities	8,673,125	2,956,551
Net Amounts Presented in the Statement of Financial Condition, Liabilities	-20,096,179	-15,827,487
Gross Amounts not Offset in the Statement of Financial Condition, Liabilities, Financial Instruments	19,707,117	15,827,487
Gross Amounts not Offset in the Statement of Financial Condition, Liabilities, Cash Collateral Received	'	'
Liabilities, Net Amount	-389,062	'
Net fair value	-298,663	12,536,456
MB Master Fund L.P. [Member] | Options Purchased [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Recognized, Assets	19,707,117	26,469,973
Net Amounts Presented in the Statement of Financial Condition, Assets	19,707,117	26,469,973
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Financial Instruments	-19,707,117	-15,827,487
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Cash Collateral Received	'	'
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Net Amount	'	10,642,486
MB Master Fund L.P. [Member] | Options Premium Received [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Recognized, Liabilities	-20,096,179	-15,827,487
Net Amounts Presented in the Statement of Financial Condition, Liabilities	-20,096,179	-15,827,487
Gross Amounts not Offset in the Statement of Financial Condition, Liabilities, Financial Instruments	19,707,117	15,827,487
Gross Amounts not Offset in the Statement of Financial Condition, Liabilities, Cash Collateral Received	'	'
Liabilities, Net Amount	-389,062	'
MB Master Fund L.P. [Member] | Futures [Member]	'	'
Derivative [Line Items]	'	'
Gross Amounts Recognized, Assets	8,763,524	4,850,521
Gross Amounts Offset in the Statement of Financial Condition, Assets	-8,673,125	-2,956,551
Net Amounts Presented in the Statement of Financial Condition, Assets	90,399	1,893,970
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Cash Collateral Received	'	'
Gross Amounts not Offset in the Statement of Financial Condition, Assets, Net Amount	90,399	1,893,970
Gross Amounts Recognized, Liabilities	-8,673,125	-2,956,551
Gross Amount Offset in the Statement of Financial Condition, Liabilities	8,673,125	2,956,551
Gross Amounts not Offset in the Statement of Financial Condition, Liabilities, Cash Collateral Received	'	'

Investment_in_Master_Derivativ

Investment in Master - Derivative Instruments, Fair Value Based on Hierarchy (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]	'	'
Total assets	$28,470,641	$31,320,494
Derivative liabilities	28,769,304	18,784,038
Net fair value	-298,663	12,536,456
Futures [Member]	'	'
Derivative [Line Items]	'	'
Total assets	8,763,524	4,850,521
Derivative liabilities	8,673,125	2,956,551
Options Purchased [Member]	'	'
Derivative [Line Items]	'	'
Total assets	19,707,117	26,469,973
Options Premium Received [Member]	'	'
Derivative [Line Items]	'	'
Derivative liabilities	20,096,179	15,827,487
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member]	'	'
Derivative [Line Items]	'	'
Total assets	28,470,641	31,320,494
Derivative liabilities	28,769,304	18,784,038
Net fair value	-298,663	12,536,456
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] | Futures [Member]	'	'
Derivative [Line Items]	'	'
Total assets	8,763,524	4,850,521
Derivative liabilities	8,673,125	2,956,551
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] | Options Purchased [Member]	'	'
Derivative [Line Items]	'	'
Total assets	19,707,117	26,469,973
Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1) [Member] | Options Premium Received [Member]	'	'
Derivative [Line Items]	'	'
Derivative liabilities	20,096,179	15,827,487
Significant Other Observable Inputs (Level 2) [Member]	'	'
Derivative [Line Items]	'	'
Total assets	'	'
Derivative liabilities	'	'
Net fair value	'	'
Significant Other Observable Inputs (Level 2) [Member] | Futures [Member]	'	'
Derivative [Line Items]	'	'
Total assets	'	'
Derivative liabilities	'	'
Significant Other Observable Inputs (Level 2) [Member] | Options Purchased [Member]	'	'
Derivative [Line Items]	'	'
Total assets	'	'
Significant Other Observable Inputs (Level 2) [Member] | Options Premium Received [Member]	'	'
Derivative [Line Items]	'	'
Derivative liabilities	'	'
Significant Unobservable Inputs (Level 3) [Member]	'	'
Derivative [Line Items]	'	'
Total assets	'	'
Derivative liabilities	'	'
Net fair value	'	'
Significant Unobservable Inputs (Level 3) [Member] | Futures [Member]	'	'
Derivative [Line Items]	'	'
Total assets	'	'
Derivative liabilities	'	'
Significant Unobservable Inputs (Level 3) [Member] | Options Purchased [Member]	'	'
Derivative [Line Items]	'	'
Total assets	'	'
Significant Unobservable Inputs (Level 3) [Member] | Options Premium Received [Member]	'	'
Derivative [Line Items]	'	'
Derivative liabilities	'	'

Investment_in_Master_Changes_i

Investment in Master - Changes in Net Asset Value Per Unit for Individual Investors (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Ratios to average net assets:	'	'	'	'
Net investment income (loss)	-6.40%	-7.90%	-7.00%	-7.30%
Operating expenses	6.40%	7.90%	7.00%	7.40%
MB Master Fund L.P. [Member]	'	'	'	'
Ratios to average net assets:	'	'	'	'
Net investment income (loss)	-1.80%	-1.80%	-1.90%	-1.50%
Operating expenses	1.90%	1.90%	1.90%	1.50%
Total return	4.80%	1.60%	4.10%	0.30%

Investment_in_Master_Changes_i1

Investment in Master - Changes in Net Asset Value Per Unit for Individual Investors (Parenthetical) (Detail) (MB Master Fund L.P. [Member])	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
MB Master Fund L.P. [Member]	'	'	'	'
Related Party Transaction [Line Items]	'	'	'	'
Expense reimbursements percentage	0.02%	0.03%	0.02%	0.04%

Investment_in_Master_Gross_Fai

Investment in Master - Gross Fair Values of Derivative Instruments of Futures and Options Contracts (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]	'	'
Net unrealized appreciation on open futures contracts	$90,399	$1,893,970
Derivative assets	28,470,641	31,320,494
Derivative liabilities	-28,769,304	-18,784,038
Options Purchased [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	19,707,117	'
Options Purchased [Member] | Energy [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	296,352	'
Options Purchased [Member] | Grains [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	8,939,288	'
Options Purchased [Member] | Softs [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	9,578,617	'
Options Purchased [Member] | Livestock [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	892,860	'
Options Premium Received [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-20,096,179	-15,827,487
Options Premium Received [Member] | Energy [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-531,821	'
Options Premium Received [Member] | Grains [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-13,083,069	'
Options Premium Received [Member] | Softs [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-5,465,929	'
Options Premium Received [Member] | Livestock [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative liabilities	-1,015,360	'
Option Contracts [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	26,469,973
Derivative liabilities	'	-15,827,487
Option Contracts [Member] | Energy [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	1,710,022
Option Contracts [Member] | Grains [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	19,721,798
Derivative liabilities	'	-14,739,088
Option Contracts [Member] | Softs [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	2,862,003
Derivative liabilities	'	-632,179
Option Contracts [Member] | Livestock [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	781,760
Option Contracts [Member] | Metals [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	1,394,390
Derivative liabilities	'	-456,220
Futures [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	8,763,524	4,850,521
Derivative liabilities	-8,673,125	-2,956,551
Futures [Member] | Energy [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	1,631,958	1,359,790
Derivative liabilities	-1,667,667	-589,780
Futures [Member] | Grains [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	6,585,897	2,333,747
Derivative liabilities	-6,627,917	-1,480,902
Futures [Member] | Softs [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	545,669	785,921
Derivative liabilities	-377,541	-505,742
Futures [Member] | Livestock [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	296,918
Derivative liabilities	'	-304,817
Futures [Member] | Metals [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivative assets	'	74,145
Derivative liabilities	'	($75,310)

Investment_in_Master_Trading_G

Investment in Master - Trading Gains and Losses by Market Sector on Derivative Instruments (Detail) (MB Master Fund L.P. [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	$13,292,384	$6,850,473	$13,489,270	$4,064,479
Currencies [Member]	'	'	'	'
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	'	-2,484	'	-2,484
Energy [Member]	'	'	'	'
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	2,079,186	-5,190,937	-1,811,959	-9,697,122
Grains [Member]	'	'	'	'
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	21,561,783	10,215,677	30,000,239	14,560,401
Livestock [Member]	'	'	'	'
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	-118,846	-1,530,435	-3,259,954	-4,025,931
Metals [Member]	'	'	'	'
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	'	224,555	-70,689	422,380
Softs [Member]	'	'	'	'
Trading Activity, Gains and Losses, Net [Line Items]	'	'	'	'
Trading gains and losses	($10,229,739)	$3,134,097	($11,368,367)	$2,807,235

Financial_Instrument_Risks_Add

Financial Instrument Risks - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Financial instruments maturity period	'1 year

Critical_Accounting_Policies_A

Critical Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Regulatory Assets [Abstract]	'	'
Transfers of assets or liabilities between Level 1 and Level 2	$0	$0