Ceres Tactical Commodity 10-K 26 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 28, 2019	Jun. 30, 2018
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	ck0001325676
Entity Registrant Name	CERES TACTICAL COMMODITY L.P.
Entity Central Index Key	0001325676
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 63,303,460
Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		80,470.8107
Class D [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		600.0580
Class Z [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		99.2020

Statements of Financial Conditi

Statements of Financial Condition - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Assets:
Investment in the Fund(s), at fair value	[1]	$ 5,489,732	$ 69,682,811
Redemptions receivable from the Fund(s)		21,653	7,919,027
Equity in trading account:
Unrestricted cash		46,452,179	220,802
Restricted cash		7,608,136	0
Net unrealized appreciation on open futures contracts		1,757,511
Options purchased, at fair value (premiums paid $555,793 and $0 at December 31, 2018 and 2017, respectively)		305,214
Total equity in trading account		56,123,040	220,802
Cash at bank			436
Interest receivable		94,727
Total assets		61,729,152	77,823,076
Liabilities:
Net unrealized depreciation on open forward contracts		364,117
Options written, at fair value (premiums received $506,194 and $0 at December 31, 2018 and 2017, respectively)		409,571
Accrued expenses:
Ongoing selling agent fees		99,660	127,998
Management fees		82,317	80,706
General Partner fees		50,530	64,565
Incentive Fees		957,011
Professional fees		220,343	216,978
Redemptions payable to General Partner			250,000
Redemptions payable to Limited Partners		1,326,737	7,367,055
Total liabilities		3,510,286	8,107,302
Partners' Capital:
Total partners' capital (net asset value)		58,218,866	69,715,774
Total liabilities and partners' capital		61,729,152	77,823,076
Forwards [Member]
Liabilities:
Net unrealized depreciation on open forward contracts		364,117
Futures [Member]
Equity in trading account:
Net unrealized appreciation on open futures contracts		1,757,511
Class Z [Member]
Partners' Capital:
General Partner		755,325	769,492
Total partners' capital (net asset value)		$ 755,325	$ 769,492
Net asset value per Redeemable Unit		$ 1,013.83	$ 966.76
Class A [Member]
Partners' Capital:
Limited Partners		$ 56,857,034	$ 68,946,282
Total partners' capital (net asset value)		$ 56,857,034	$ 68,946,282
Net asset value per Redeemable Unit		$ 1,300.66	$ 1,265.64
Class D [Member]
Partners' Capital:
Limited Partners		$ 606,507
Total partners' capital (net asset value)		$ 606,507
Net asset value per Redeemable Unit		$ 1,010.75
[1]	Defined in Note 1.

Statements of Financial Condi_2

Statements of Financial Condition (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Options purchased, premiums paid	$ 555,793	$ 0
Options written, premiums received	$ 506,194	$ 0
Class Z [Member]
General Partner Redeemable Units outstanding	745.0230	795.9520
Class A [Member]
Limited Partners Redeemable Units outstanding	43,713.9067	54,475.3577
Class D [Member]
Limited Partners Redeemable Units outstanding	600.0580	0

Condensed Schedule of Investmen

Condensed Schedule of Investments	Dec. 31, 2018USD ($)Derivative
Schedule of Investments [Line Items]
Investment, Fair Value	$ 5,489,732	[1]
Percentage of Partners' Capital	9.43%
Futures [Member]
Schedule of Investments [Line Items]
Net unrealized appreciation (depreciation) on open contracts	$ 1,757,511
Percentage of Partners' Capital	3.02%
Total unrealized appreciation on open contracts	$ 6,579,887
Total unrealized depreciation on open contracts	(4,822,376)
Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Investment, Fair Value	$ (3,725,151)
Percentage of Partners' Capital	(6.40%)
Contracts Purchased [Member] | Option [Member]
Schedule of Investments [Line Items]
Investment, Fair Value	$ 305,214
Percentage of Partners' Capital	0.52%
Contracts Sold [Member] | Futures [Member]
Schedule of Investments [Line Items]
Investment, Fair Value	$ 5,482,662
Percentage of Partners' Capital	9.42%
Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Investment, Fair Value	$ (409,571)
Percentage of Partners' Capital	(0.70%)
Metals [Member] | Futures [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	$ 125,934
Total unrealized depreciation on open contracts	$ (295,124)
Metals [Member] | Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	132
Investment, Fair Value	$ (17,816)
Percentage of Partners' Capital	(0.03%)
Metals [Member] | Contracts Sold [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	127
Investment, Fair Value	$ (151,374)
Percentage of Partners' Capital	(0.26%)
Currencies [Member] | Futures [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	$ 14,578
Total unrealized depreciation on open contracts	$ (1,159)
Currencies [Member] | Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	35
Investment, Fair Value	$ 13,419
Percentage of Partners' Capital	0.02%
Energy [Member] | Futures [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	$ 5,628,038
Total unrealized depreciation on open contracts	$ (3,938,643)
Energy [Member] | Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	1,827
Investment, Fair Value	$ (3,537,375)
Percentage of Partners' Capital	(6.08%)
Energy [Member] | Contracts Sold [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	2,168
Investment, Fair Value	$ 5,226,770
Percentage of Partners' Capital	8.98%
Grains [Member] | Futures [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	$ 157,540
Total unrealized depreciation on open contracts	$ (66,943)
Grains [Member] | Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	269
Investment, Fair Value	$ (34,732)
Percentage of Partners' Capital	(0.06%)
Grains [Member] | Contracts Sold [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	306
Investment, Fair Value	$ 125,329
Percentage of Partners' Capital	0.22%
Livestock [Member] | Futures [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	$ 317,100
Total unrealized depreciation on open contracts	$ (252,835)
Livestock [Member] | Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	424
Investment, Fair Value	$ (133,210)
Percentage of Partners' Capital	(0.22%)
Livestock [Member] | Contracts Sold [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	501
Investment, Fair Value	$ 197,475
Percentage of Partners' Capital	0.34%
Softs [Member] | Futures [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	$ 336,697
Total unrealized depreciation on open contracts	$ (267,672)
Softs [Member] | Contracts Purchased [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	284
Investment, Fair Value	$ (15,437)
Percentage of Partners' Capital	(0.03%)
Softs [Member] | Contracts Sold [Member] | Futures [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	367
Investment, Fair Value	$ 84,462
Percentage of Partners' Capital	0.14%
Forwards [Member]
Schedule of Investments [Line Items]
Net unrealized appreciation (depreciation) on open contracts	$ (364,117)
Percentage of Partners' Capital	(0.63%)
Total unrealized appreciation on open contracts	$ 2,203,511
Total unrealized depreciation on open contracts	(2,567,628)
Forwards [Member] | Metals [Member]
Schedule of Investments [Line Items]
Total unrealized appreciation on open contracts	2,203,511
Total unrealized depreciation on open contracts	(2,567,628)
CMF Harbour Square Master Fund LLC [Member]
Schedule of Investments [Line Items]
Investment, Fair Value	$ 5,489,732
Percentage of Partners' Capital	9.43%
Assets [Member] | Forwards [Member]
Schedule of Investments [Line Items]
Percentage of Partners' Capital	3.78%
Assets [Member] | Forwards [Member] | Metals [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	677
Percentage of Partners' Capital	3.78%
Calls [Member] | Metals [Member] | Contracts Purchased [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	244
Investment, Fair Value	$ 37,084
Percentage of Partners' Capital	0.06%
Calls [Member] | Metals [Member] | Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	141
Investment, Fair Value	$ (13,833)
Percentage of Partners' Capital	(0.02%)
Calls [Member] | Energy [Member] | Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	44
Investment, Fair Value	$ (34,760)
Percentage of Partners' Capital	(0.06%)
Calls [Member] | Grains [Member] | Contracts Purchased [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	110
Investment, Fair Value	$ 27,500
Percentage of Partners' Capital	0.05%
Calls [Member] | Livestock [Member] | Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	18
Investment, Fair Value	$ (17,820)
Percentage of Partners' Capital	(0.03%)
Calls [Member] | Softs [Member] | Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	27
Investment, Fair Value	$ (44,820)
Percentage of Partners' Capital	(0.08%)
Puts [Member] | Metals [Member] | Contracts Purchased [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	94
Investment, Fair Value	$ 185,370
Percentage of Partners' Capital	0.32%
Puts [Member] | Metals [Member] | Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	117
Investment, Fair Value	$ (225,236)
Percentage of Partners' Capital	(0.39%)
Puts [Member] | Energy [Member] | Contracts Purchased [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	36
Investment, Fair Value	$ 35,640
Percentage of Partners' Capital	0.06%
Puts [Member] | Livestock [Member] | Contracts Purchased [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	62
Investment, Fair Value	$ 19,620
Percentage of Partners' Capital	0.03%
Puts [Member] | Softs [Member] | Contracts Sold [Member] | Option [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	104
Investment, Fair Value	$ (73,102)
Percentage of Partners' Capital	(0.12%)
Liabilities [Member] | Forwards [Member]
Schedule of Investments [Line Items]
Percentage of Partners' Capital	(4.41%)
Liabilities [Member] | Forwards [Member] | Metals [Member]
Schedule of Investments [Line Items]
Number of Contracts | Derivative	774
Percentage of Partners' Capital	(4.41%)
[1]	Defined in Note 1.

Condensed Schedule of Investm_2

Condensed Schedule of Investments (Parenthetical) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Schedule of Investments [Abstract]
Options purchased, premium paid	$ 555,793	$ 0
Options written, premium received	$ 506,194	$ 0

Statements of Income and Expens

Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Income:
Interest income		$ 719,779
Interest income allocated from the Fund(s)		394,826	$ 727,298	$ 233,243
Total investment income		1,114,605	727,298	233,243
Expenses:
Expenses allocated from the Fund(s)		318,864	1,273,261	2,366,798
Clearing fees related to direct investments		497,270
Ongoing selling agent fees		1,312,283	1,859,839	2,389,918
Management fees		1,026,535	1,171,819	1,488,211
General Partner fees		662,607	937,457	1,190,569
Incentive fees		1,017,644
Professional fees		351,346	367,567	422,490
Total expenses		5,186,549	5,609,943	7,857,986
Net investment loss		(4,071,944)	(4,882,645)	(7,624,743)
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net realized gains (losses) on closed contracts		4,886,607
Net realized gains (losses) on closed contracts allocated from the Fund(s)		(113,328)	704,058	14,272,175
Net change in unrealized gains (losses) on open contracts		1,238,838
Net change in unrealized gains (losses) on open contracts allocated from the Fund(s)		(94,059)	(867,058)	(272,777)
Total trading results		5,918,058	(163,000)	13,999,398
Net income (loss)		1,846,114	(5,045,645)	6,374,655
Class A [Member]
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net income (loss)		$ 1,803,774	$ (5,007,550)	$ 6,374,655
Net income (loss) per Redeemable Unit	[1]	$ 35.02	$ (70.06)	$ 67.32
Weighted average Redeemable Units outstanding		50,108.3523	71,151.3143	89,440.9985
Class D [Member]
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net income (loss)		$ 6,507
Net income (loss) per Redeemable Unit	[1],[2]	$ 10.75
Weighted average Redeemable Units outstanding	[2]	583.3817
Class Z [Member]
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net income (loss)		$ 35,833	$ (38,095)
Net income (loss) per Redeemable Unit	[1]	$ 47.07	$ (33.24)
Weighted average Redeemable Units outstanding		757.7553	1,159.9809
[1]	Represents the change in net asset value per Redeemable Unit.
[2]	From July 1, 2018, the date Class D Redeemable Units were first issued, to December 31, 2018.

Statements of Changes in Partne

Statements of Changes in Partners' Capital - USD ($)	Total	Class A [Member]	Class D [Member]	Class Z [Member]	General Partner [Member]	General Partner [Member]Class A [Member]	General Partner [Member]Class Z [Member]	Limited Partners [Member]	Limited Partners [Member]Class A [Member]	Limited Partners [Member]Class D [Member]
Net asset value per Redeemable Unit									$ 1,268.38
Partners' Capital, beginning of period at Dec. 31, 2015	$ 132,292,532	$ 132,292,532
Subscriptions								$ 2,599,667	$ 2,599,667
Partners' Capital, Redeemable Units, beginning of period at Dec. 31, 2015	104,300.7562	104,300.7562
Subscriptions, Redeemable Units								2,045.394	2,045.394
Redemptions					$ (531,594)	$ (531,594)		$ (37,302,216)	$ (37,302,216)
Redemptions, Redeemable Units					(406.191)	(406.191)		(28,502.453)	(28,502.453)
Net income (loss)	$ 6,374,655	$ 6,374,655
Partners' Capital, end of period at Dec. 31, 2016	$ 103,433,044	$ 103,433,044
Partners' Capital, Redeemable Units, end of period at Dec. 31, 2016	77,437.5062	77,437.5062
Net asset value per Redeemable Unit		$ 1,335.70							$ 1,335.70
Subscriptions					$ 1,307,587		$ 1,307,587	$ 8,154,804	$ 8,154,804
Subscriptions, Redeemable Units					1,307.587		1,307.587	6,106.382	6,106.382
Redemptions					$ (1,708,476)	$ (1,208,476)	$ (500,000)	$ (36,425,540)	$ (36,425,540)
Redemptions, Redeemable Units					(1,416.3885)	(904.7535)	(511.6350)	(28,163.777)	(28,163.777)
Net income (loss)	$ (5,045,645)	$ (5,007,550)		$ (38,095)
Partners' Capital, end of period at Dec. 31, 2017	$ 69,715,774	$ 68,946,282		$ 769,492
Partners' Capital, Redeemable Units, end of period at Dec. 31, 2017	55,271.3097	54,475.3577		795.9520
Net asset value per Redeemable Unit		$ 1,265.64		$ 966.76					$ 1,265.64	$ 1,000
Subscriptions								$ 8,565,516	$ 7,965,516	$ 600,000
Subscriptions, Redeemable Units								6,766.259	6,166.201	600.058
Redemptions					$ (50,000)		$ (50,000)	$ (21,858,538)	$ (21,858,538)
Redemptions, Redeemable Units					(50.929)		(50.929)	(16,927.652)	(16,927.652)
Net income (loss)	$ 1,846,114	$ 1,803,774	$ 6,507	$ 35,833
Partners' Capital, end of period at Dec. 31, 2018	$ 58,218,866	$ 56,857,034	$ 606,507	$ 755,325
Partners' Capital, Redeemable Units, end of period at Dec. 31, 2018	45,058.9877	43,713.9067	600.0580	745.0230
Net asset value per Redeemable Unit		$ 1,300.66	$ 1,010.75	$ 1,013.83					$ 1,300.66	$ 1,010.75

Organization

Organization	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	1. Organization: Ceres Tactical Commodity L.P. (formerly, Managed Futures Premier Aventis II 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 (as 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 sectors traded include energy, grains, livestock, metals and softs. The commodity interests that are traded by the Partnership directly or indirectly through its investment in the Funds (as defined below) are volatile and involve a high degree of market risk. The General Partner may also determine to invest up to all of the Partnership’s assets (directly or indirectly through its investment in the Funds) in United States (“U.S.”) Treasury bills and/or money market mutual funds, including money market mutual funds managed by Morgan Stanley or its affiliates. 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 and is the trading manager (the “Trading Manager”) of Harbour Square Master (as defined below). As of January 1, 2017, the General Partner became a wholly-owned wholly-owned As of December 31, 2018, all trading decisions are made for the Partnership by Millburn Ridgefield Corporation (“Millburn”), Ospraie Management, LLC (“Ospraie”), Aquantum GmbH (“Aquantum”) and Harbour Square Capital Management LLC (“Harbour Square”) (each, an “Advisor” and, collectively, the “Advisors”), each, a registered commodity trading advisor. Effective November 30, 2018, Aventis Asset Management, LLC (“Aventis”) ceased to act as a commodity trading advisor to the Partnership. Each Advisor is allocated a portion of the Partnership’s assets to manage. The Partnership invests the portion of its assets allocated to each of the Advisors either directly, through individually managed accounts, or indirectly through its investment in the Funds. References herein to the “Advisors” may also include, as relevant, Aventis. During the periods covered by this report, the Partnership’s/Funds’ commodity broker was Morgan Stanley & Co. LLC (“MS&Co.”), a registered futures commission merchant. The Partnership/Funds deposited a portion of their cash in non-trading CMF Harbour Square Master Fund LLC (“Harbour Square Master”), the Partnership and prior to the Partnership’s full redemption on November 30, 2018, MB Master Fund L.P. (“MB Master”), have entered into futures brokerage account agreements with MS&Co. Harbour Square Master is referred to as the “Fund”. Reference herein to the “Funds” may include MB Master. As of June 13, 2018, the Partnership began offering three classes of limited partnership interests, Class A Redeemable Units, Class D Redeemable Units and Class Z Redeemable Units. All Redeemable Units issued prior to October 31, 2016 were deemed “Class A Redeemable Units.” Class Z Redeemable Units were first issued on January 1, 2017. The rights, liabilities, risks and fees associated with investment in the Class A Redeemable Units were not changed. Class D Redeemable Units were first issued July 1, 2018. The rights, liabilities, risks, and fees associated with investment in the Class A Redeemable Units and Class Z Redeemable Units were not changed. Class A Redeemable Units, Class D Redeemable Units and Class Z Redeemable Units will each be referred to as a “Class” and collectively referred to as the “Classes.” Class A Redeemable Units and Class D Redeemable Units are available to taxable U.S. individuals and institutions, U.S. tax exempt individuals and institutions and non-U.S. Millburn, Ospraie and Aquantum directly trade the Partnership’s assets allocated to each Advisor through managed accounts in the name of the Partnership pursuant to Millburn’s Commodity Program, Ospraie’s Commodity Program and Aquantum’s Commodity Spread Program, respectively. The Partnership will be liquidated upon the first to occur of the following: December 31, 2055; the net asset value per Redeemable Unit decreases to less than $400 as of a close of any business day; or under certain other circumstances as set forth in the limited partnership agreement of the Partnership (the “Limited Partnership Agreement”). In addition, the General Partner may, in its sole discretion, cause the Partnership to dissolve if the Partnership’s aggregate net assets decline to less than $1,000,000. In July 2015, the General Partner delegated certain administrative functions to SS&C Technologies, Inc., a Delaware corporation, currently doing business as SS&C GlobeOp (the “Administrator”). Pursuant to a master services agreement, the Administrator furnishes certain administrative, accounting, regulatory reporting, tax and other services as agreed from time to time. In addition, the Administrator maintains certain books and records of the Partnership. The cost of retaining the Administrator is allocated among the pools operated by the General Partner, including the Partnership.

Basis of Presentation and Summa

Basis of Presentation and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation and Summary of Significant Accounting Policies	2. Basis of Presentation and Summary of Significant Accounting Policies: a. Use of Estimates. b . Profit Allocation. c. Statement of Cash Flows Statement of Cash Flows d. Partnership’s Investment in the Funds. e. Partnership’s/Funds’ Derivative Investments. first-in, first-out The Partnership/Funds do not isolate the portion of the results of operations arising from the effect of changes in foreign exchange rates on investments due to fluctuations from changes in market prices of investments held. Such fluctuations are included in total trading results in the Partnership’s/Funds’ Statements of Income and Expenses. f. Partnership’s Cash g. Income Taxes. “Income Taxes,” “more-likely-than-not” more-likely-than-not h. Investment Company Status. 2013-08, Financial Services — Investment Companies (Topic 946): Amendments to the Scope, Measurement and Disclosure Requirements i. Net Income (Loss) per Redeemable Unit. “Financial Services — Investment Companies

Agreements

Agreements	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
Agreements	3. Agreements: a. Limited Partnership Agreement: The General Partner administers the business and affairs of the Partnership, including selecting one or more advisors to make trading decisions for the Partnership. As of December 31, 2018, the Partnership paid the General Partner a monthly General Partner fee in return for its services to the Partnership equal to 1/12 of 1% (1% per year) of month-end Month-end b. Management Agreement: The General Partner, on behalf of the Partnership, entered into management agreements (each, a “Management Agreement”) with the Advisors. The Advisors are not affiliated with one another, are not affiliated with the General Partner or MS&Co. and are not responsible for the organization or operation of the Partnership. The Partnership pays Millburn a monthly management fee equal to 1/12 of 2.0% (2.0% per year) of month-end month-end month-end month-end month-end Month-end In addition, the Partnership is obligated to pay each Advisor an incentive fee. The Partnership pays Millburn and Ospraie each an incentive fee, payable annually, equal to 20% of New Trading Profits, as defined in each Management Agreement, earned by the relevant Advisor for the Partnership during each calendar year. The Partnership pays Harbour Square an incentive fee, payable quarterly, equal to 20% of New Trading Profits, as defined in the Management Agreement, earned by Harbour Square for the Partnership during each calendar quarter. The Partnership pays Aquantum a semi-annual incentive fee of 20% of New Trading Profits, as defined in the Management Agreement, earned by Aquantum for the Partnership each calendar half-year. Prior to its termination on November 30, 2018, Aventis was eligible to receive an incentive fee payable quarterly, equal to 20% of New Trading Profits, as defined in the Management Agreement. An Advisor’s incentive fee is allocated proportionally to each Class based on the net asset value of the respective Class. To the extent an Advisor incurs a loss for the Partnership, the Advisor will not be paid an incentive fee until the Advisor recovers the net loss incurred and earns additional new trading profits for the Partnership. Each Management Agreement can be terminated upon notice by either party. In allocating substantially all of the assets of the Partnership among the Advisors, the General Partner considers, among other factors, the Advisors’ past performance, trading style, volatility of markets traded and fee requirements. The General Partner may modify or terminate the allocation of assets among the Advisors and may allocate assets to additional advisors at any time. c. Customer Agreement: The Partnership has entered into a customer agreement with MS&Co. (the “Partnership Customer Agreement”). Under the Partnership Customer Agreement, the Partnership pays trading fees for the clearing and, where applicable, the execution of transactions, as well as exchange, clearing, user, give-up, 4-week 4-week d. Selling Agreement: The Partnership has entered into a selling agreement (the “Selling Agreement”) with Morgan Stanley Wealth Management. Pursuant to the Selling Agreement, the Partnership pays Morgan Stanley Wealth Management a monthly ongoing selling agent fee equal to (i) 2.0% per year of month-end month-end Month-end

Trading Activities

Trading Activities	12 Months Ended
	Dec. 31, 2018
Brokers and Dealers [Abstract]
Trading Activities	4. Trading Activities: The Partnership was formed for the purpose of trading contracts in a variety of commodity interests, including derivative financial instruments and derivative commodity interests. The results of the Partnership’s trading activities are shown in the Statements of Income and Expenses. The Partnership also invests certain of its assets through a “master/feeder” structure. The Partnership’s pro-rata The Partnership Customer Agreement and the Funds’ futures brokerage account agreements with MS&Co. (the “Master Customer Agreements” and, together with the Partnership Customer Agreement, the “Customer Agreements”) give the Partnership and the Funds, respectively, the legal right to net unrealized gains and losses on open futures and forward contracts in their respective Statements of Financial Condition. The Partnership and the Funds net, for financial reporting purposes, the unrealized gains and losses on open futures and open forward contracts in their respective Statements of Financial Condition, as the criteria under ASC 210-20, Balance Sheet All of the commodity interests owned directly by the Partnership are held for trading purposes. All of the commodity interests owned by the Funds are held for trading purposes. The monthly average number of futures contracts traded directly by the Partnership during the year ended December 31, 2018 was 4,091. The monthly average number of metals forward contracts traded directly by the Partnership during the year ended December 31, 2018 was 1,035. The monthly average number of option contracts traded directly by the Partnership during the year ended December 31, 2018 was 1,205. There were no direct investments at December 31, 2017. Trading and transaction fees are based on the number of trades executed by the Advisors for the Partnership/Funds and the Partnership’s respective percentage ownership of each Fund. All clearing fees paid to MS&Co. are borne directly by the Partnership for its direct trading. In addition, clearing fees are borne by the Funds for indirect trading and allocated to the Funds’ limited partners/members, including the Partnership. The following table summarizes the gross and net amounts recognized relating to assets and liabilities of the Partnership’s derivatives and their offsetting subject to master netting arrangements or similar agreements as of December 31, 2018. Gross Amounts Amounts Gross Amounts Not Offset in the Offset in the Presented in the Statements of Financial Condition Gross Statements of Statements of Cash Collateral Amounts Financial Financial Financial Received/ December 31, 2018 Recognized Condition Condition Instruments Pledged* Net Amount Assets Futures $ 6,579,887 $ (4,822,376 ) $ 1,757,511 $ - $ - $ 1,757,511 Forwards 2,203,511 (2,203,511 ) - - - - Total assets $ 8,783,398 $ (7,025,887 ) $ 1,757,511 $ - $ - $ 1,757,511 Liabilities Futures $ (4,822,376 ) $ 4,822,376 $ - $ - $ - $ - Forwards (2,567,628 ) 2,203,511 (364,117 ) - - (364,117) Total liabilities $ (7,390,004 ) $ 7,025,887 $ (364,117 ) $ - $ - $ (364,117) Net fair value $ 1,393,394 * * In the event of default by the Partnership, MS&Co., the Partnership’s commodity futures broker and the sole counterparty to the Partnership’s non-exchange-traded The following table indicates the gross fair values of derivative instruments of futures, forward and option contracts held directly by the Partnership as separate assets and liabilities as of December 31, 2018. As of December 31, 2017, no derivative instruments were held directly by the Partnership. December 31, 2018 Assets Futures Contracts Currencies $ 14,578 Energy 5,628,038 Grains 157,540 Livestock 317,100 Metals 125,934 Softs 336,697 Total unrealized appreciation on open futures contracts 6,579,887 Liabilities Futures Contracts Currencies (1,159 ) Energy (3,938,643 ) Grains (66,943 ) Livestock (252,835 ) Metals (295,124 ) Softs (267,672 ) Total unrealized depreciation on open futures contracts (4,822,376 ) Net unrealized appreciation on open futures contracts $ 1,757,511 * Assets Forward Contracts Metals $ 2,203,511 Total unrealized appreciation on open forward contracts 2,203,511 Liabilities Forward Contracts Metals (2,567,628 ) Total unrealized depreciation on open forward contracts (2,567,628 ) Net unrealized depreciation on open forward contracts $ (364,117 ) ** Assets Options Purchased Energy $ 35,640 Grains 27,500 Livestock 19,620 Metals 222,454 Total options purchased $ 305,214 *** Liabilities Options Written Energy $ (34,760 ) Livestock (17,820 ) Metals (239,069 ) Softs (117,922 ) Total options written $ (409,571 ) **** * This amount is in “Net unrealized appreciation on open futures contracts” in the Statements of Financial Condition. ** This amount is in “Net unrealized depreciation on open forward contracts” in the Statements of Financial Condition. *** This amount is in “Options purchased, at fair value” in the Statements of Financial Condition. **** This amount is in “Options written, at fair value” in the Statements of Financial Condition. The following table indicates the trading gains and losses, by market sector, on derivative instruments traded directly by the Partnership for the year ended December 31, 2018. During the years ended December 31, 2017 and 2016, no derivative instruments were traded directly by the Partnership. Sector 2018 Currencies $ (361,231) Energy 5,468,819 Grains 147,389 Interest Rates Non-U.S. 17,430 Livestock 570,324 Metals (865,848) Softs 1,148,562 Total $ 6,125,445 ***** *****

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	5. Fair Value Measurements: Partnership’s and the Funds’ Fair Value Measurements The fair value of exchange-traded futures, option and forward contracts is determined by the various exchanges, and reflects the settlement price for each contract as of the close of business on the last business day of the reporting period. The fair value of foreign currency forward contracts is extrapolated on a forward basis from the spot prices quoted as of approximately 3:00 P.M. (E.T.) on the last business day of the reporting period from various exchanges. The fair value of non-exchange-traded The Partnership and the Funds consider prices for commodity futures, swap and option contracts to be based on unadjusted quoted prices in active markets for identical assets and liabilities (Level 1). The values of U.S. Treasury bills, non-exchange-traded There were no direct investments at December 31 2017. December 31, 2018 Total Level 1 Level 2 Level 3 Assets Futures $ 6,579,887 $ 6,579,887 $ - $ - Forwards 2,203,511 - 2,203,511 - Options purchased 305,214 305,214 - - Total assets $ 9,088,612 $ 6,885,101 $ 2,203,511 $ - Liabilities Futures $ 4,822,376 $ 4,822,376 $ - $ - Forwards 2,567,628 - 2,567,628 - Options written 409,571 409,571 - - Total liabilities $ 7,799,575 $ 5,231,947 $ 2,567,628 $ -

Investment in the Funds

Investment in the Funds	12 Months Ended
	Dec. 31, 2018
Schedule of Investments [Abstract]
Investment in the Funds	6. Investment in the Funds: On January 1, 2018, the Partnership allocated a portion of its assets to Harbour Square Master, a limited liability company organized under the limited liability company laws of the State of Delaware. Harbour Square Master permits accounts managed by Harbour Square using Harbour Square’s Discretionary Energy Program, a proprietary, discretionary trading system, to invest together in one trading vehicle. The General Partner is also the trading manager of Harbour Square Master. Individual and pooled accounts currently managed by Harbour Square, including the Partnership, are permitted to be members of Harbour Square Master. The Trading Manager and Harbour Square believe that trading through this structure should promote efficiency and economy in the trading process. The Trading Manager and Harbour Square have agreed that Harbour Square will trade the Partnership’s assets allocated to Harbour Square Master at a level that is up to 1.5 times the amount of the assets allocated. The amount of leverage may be changed in the future. 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. Effective November 30, 2018, the Partnership fully redeemed its investment in MB Master. The General Partner is not aware of any material changes to the trading programs discussed above or in Note 1, “Organization” during the year ended December 31, 2018. The Partnership’s/Funds’ trading of futures, forward, swap and option contracts, if applicable, on commodities is done primarily on U.S. commodity exchanges and foreign commodity exchanges. The Partnership/Funds engage in such trading through commodity brokerage accounts maintained with MS&Co. Generally, a limited partner/member in the Funds withdraws all or part of its capital contribution and undistributed profits, if any, from the Funds as of the end of any month (the “Redemption Date”) after a request has been made to the General Partner/Trading Manager at least three days in advance of the Redemption Date. Such withdrawals are classified as a liability when the limited partner/member elects to redeem and informs the Funds. However, a limited partner/member may request a withdrawal as of the end of any day if such request is received by the General Partner/Trading Manager at least three days in advance of the proposed withdrawal day. Management fees, General Partner fees, ongoing selling agent fees and incentive fees are charged at the Partnership level. All clearing fees paid to MS&Co. are borne directly by the Partnership for its direct trading. In addition, clearing fees are borne by the Funds and allocated to the Funds’ limited partners/members, including the Partnership. Professional fees are borne by the Funds and allocated to the Partnership, and also charged directly at the Partnership level. At December 31, 2018, the Partnership owned approximately 68.7% of Harbour Square Master. Prior to the close of business on December 31, 2017, the Partnership owned approximately 89.3% of MB Master. It is the Partnership’s intention to continue to invest in the Fund. The performance of the Partnership is directly affected by the performance of the Funds. Expenses to investors as a result of the investment in the Funds are approximately the same as they would be if the Partnership traded directly and redemption rights are not affected. Summarized information reflecting the total assets, liabilities and partners’/members’ capital of the Funds is shown in the following tables: December 31, 2018 Total Assets Total Liabilities Total Capital Harbour Square Master $ 10,504,910 $ 2,532,233 $ 7,972,677 December 31, 2017 Total Assets Total Liabilities Total Capital MB Master $ 87,348,208 $ 9,978,681 $ 77,369,527 Summarized information reflecting the net investment income (loss), total trading results and net income (loss) of the Funds is shown in the following tables: For the year ended December 31, 2018 Net Investment Total Trading Income (Loss) Results Net Income (Loss) MB Master (a) $ 52,415 $ (951,117 ) $ (898,702 ) Harbour Square Master 244,803 416,882 661,685 For the year ended December 31, 2017 Net Investment Total Trading Income (Loss) Results Net Income (Loss) MB Master $ (523,086 ) $ (106,303 ) $ (629,389 ) (a) Summarized information reflecting the Partnership’s investments in and the Partnership’s pro-rata share of the results of operations of the Funds is shown in the following tables: December 31, 2018 For the year ended December 31, 2018 % of Expenses Net Partners’ Fair Income Clearing Professional Income Investment Redemptions Funds Capital Value (Loss) Fees Fees (Loss) Objective Permitted MB Master (a) - $ - $ (384,502 ) $ 172,975 $ 30,426 $ (587,903 ) Commodity Portfolio Monthly Harbour Square Master 9.43% 5,489,732 571,941 74,003 41,460 456,478 Commodity Portfolio Monthly Total $ 5,489,732 $ 187,439 $ 246,978 $ 71,886 $ (131,425 ) December 31, 2017 For the year ended December 31, 2017 % of Expenses Net Partners’ Fair Income Clearing Professional Income Investment Redemptions Fund Capital Value (Loss) Fees Fees (Loss) Objective Permitted MB Master 99.95% $ 69,682,811 $ 564,298 $ 1,216,893 $ 56,368 $ (708,963 ) Commodity Portfolio Monthly Total $ 69,682,811 $ 564,298 $ 1,216,893 $ 56,368 $ (708,963 ) (a)

Subscriptions, Distributions an

Subscriptions, Distributions and Redemptions	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Subscriptions, Distributions and Redemptions	7. Subscriptions, Distributions and Redemptions: Subscriptions are accepted monthly from investors who become limited partners on the first day of the month after their subscription is processed. Distributions are made on a pro-rata

Financial Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2018
Investment Company [Abstract]
Financial Highlights	8. Financial Highlights: Financial highlights for the limited partner Classes as a whole for the years ended December 31, 2018, 2017 and 2016 were as follows: 2018 2017 2016 Class A Class D** Class A Class A Per Redeemable Unit Performance (for a unit outstanding throughout the period/year):* Net realized and unrealized gains (losses) $ 115.36 $ 36.19 $ (1.95 ) $ 152.57 Net investment loss (80.34 ) (25.44 ) (68.11 ) (85.25 ) Increase (decrease) for the period/year 35.02 10.75 (70.06 ) 67.32 Net asset value per Redeemable Unit, beginning of period/year 1,265.64 1,000.00 1,335.70 1,268.38 Net asset value per Redeemable Unit, end of period/year $ 1,300.66 $ 1,010.75 $ 1,265.64 $ 1,335.70 2018 2017 2016 Class A Class D*** Class A Class A Ratios to Average Limited Partners’ Capital: Net investment loss**** (6.4 ) % (4.1 ) % (5.4 ) % (6.5 ) % Operating expenses 6.5 % 5.1 % 6.2 % 6.7 % Incentive fees 1.6 % 1.0 % - % - % Total expenses 8.1 % 6.1 % 6.2 % 6.7 % Total return: Total return before incentive fees 4.4 % 2.1 % (5.2 ) % 5.3 % Incentive fees (1.6 ) % (1.0 ) % - % - % Total return after incentive fees 2.8 % 1.1 % (5.2 ) % 5.3 % * Net investment loss per Redeemable Unit is calculated by dividing the interest income less total expenses by the average number of Redeemable Units outstanding during the period. The net realized and unrealized gains (losses) per Redeemable Unit is a balancing amount necessary to reconcile the change in net asset value per Redeemable Unit with the other per unit information. ** For the period from July 1, 2018 to December 31, 2018. *** Annualized and for the period from July 1, 2018 to December 31, 2018. **** Interest income less total expenses. The above ratios and total return may vary for individual investors based on the timing of capital transactions during the year. Additionally, these ratios are calculated for the limited partner Classes using the limited partners’ share of income, expenses and average partner’s capital of the Partnership and include the income and expenses allocated from the Funds.

Financial Instrument Risks

Financial Instrument Risks	12 Months Ended
	Dec. 31, 2018
Investments, All Other Investments [Abstract]
Financial Instrument Risks	9. Financial Instrument Risks: In the normal course of business, the Partnership and the Funds are parties to financial instruments with off-balance-sheet over-the-counter Futures Contracts. London Metals Exchange Forward Contracts. Options. marked-to-market marked-to-market As both a buyer and seller of options, the Partnership/Funds pay or receive a premium at the outset and then bear the risk of unfavorable changes in the price of the contract underlying the option. Written options expose the Partnership/Funds 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/Funds do not consider these contracts to be guarantees. Futures-style options. Market risk is the potential for changes in the value of the financial instruments traded by the Partnership/Funds due to market changes, including interest and foreign exchange rate movements and fluctuations in commodity or security prices. Market risk is directly impacted by the volatility and liquidity in the markets in which the related underlying assets are traded. The Partnership and the Funds are exposed to market risk equal to the value of the futures and forward contracts held 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/Funds’ risk of loss in the event of 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/Funds’ risk of loss is reduced through the use of legally enforceable master netting agreements with counterparties that permit the Partnership/Funds to offset unrealized gains and losses and other assets and liabilities with such counterparties upon the occurrence of certain events. The Partnership/Funds have credit risk and concentration risk, as MS&Co. or an MS&Co. affiliate are counterparties or brokers with respect to the Partnership’s/Funds’ assets. Credit risk with respect to exchange-traded instruments is reduced to the extent that, through MS&Co. or an MS&Co. affiliate, the Partnership’s/Funds’ counterparty is an exchange or clearing organization. The General Partner monitors and attempts to mitigate the Partnership’s/Funds’ 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/Funds may be subject. These monitoring systems generally allow the General Partner to statistically analyze actual trading results with risk-adjusted performance indicators and correlation statistics. In addition, online monitoring systems provide account analysis of futures, forward and option contracts by sector, margin requirements, gain and loss transactions and collateral positions. The majority of these financial instruments mature within one year of the inception date. However, due to the nature of the Partnership’s/Funds’ business, these instruments may not be held to maturity. 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. The limited liability is a result of the organization of the Partnership as a limited partnership under New York law. In the ordinary course of business, the Partnership/Funds enter into contracts and agreements that contain various representations and warranties and which provide general indemnifications. The Partnership’s/Funds’ maximum exposure under these arrangements cannot be determined, as this could include future claims that have not yet been made against the Partnership/Funds. The Partnership/Funds consider the risk of any future obligation relating to these indemnifications to be remote.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	10. Subsequent Events: The General Partner evaluates events that occur after the balance sheet date but before and up until financial statements are available to be issued. The General Partner has assessed the subsequent events through the date the financial statements were issued and has determined that, other than disclosed below, there were no subsequent events requiring adjustment to or disclosure in the financial statements. Effective January 1, 2019, the General Partner fee paid by the Partnership to the General Partner was reduced to 1/12 of 0.75% (0.75% per year) of month-end On January 1, 2019, the General Partner and the Partnership entered into a management agreement with Pan Capital Management L.P. (“Pan”). The Partnership allocated a portion of its assets to Pan on or about January 1, 2019. Pan trades the Partnership’s assets allocated to it pursuant to its Energy Trading Program. Effective March 6, 2019, Maureen O’Toole resigned as a director of the General Partner.

Basis of Presentation and Sum_2

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates.
Profit Allocation	Profit Allocation.
Statement of Cash Flows	Statement of Cash Flows Statement of Cash Flows
Partnership's Investment in the Funds	Partnership’s Investment in the Funds.
Partnership's/Funds' Derivative Investments	Partnership’s/Funds’ Derivative Investments. first-in, first-out The Partnership/Funds do not isolate the portion of the results of operations arising from the effect of changes in foreign exchange rates on investments due to fluctuations from changes in market prices of investments held. Such fluctuations are included in total trading results in the Partnership’s/Funds’ Statements of Income and Expenses.
Partnership's Cash	Partnership’s Cash
Income Taxes	Income Taxes. “Income Taxes,” “more-likely-than-not” more-likely-than-not
Investment Company Status	Investment Company Status. 2013-08, Financial Services — Investment Companies (Topic 946): Amendments to the Scope, Measurement and Disclosure Requirements
Net Income (Loss) per Redeemable Unit.	Net Income (Loss) per Redeemable Unit. “Financial Services — Investment Companies

Trading Activities (Tables)

Trading Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Brokers and Dealers [Abstract]
Summary of Valuation of Investments	The following table summarizes the gross and net amounts recognized relating to assets and liabilities of the Partnership’s derivatives and their offsetting subject to master netting arrangements or similar agreements as of December 31, 2018. Gross Amounts Amounts Gross Amounts Not Offset in the Offset in the Presented in the Statements of Financial Condition Gross Statements of Statements of Cash Collateral Amounts Financial Financial Financial Received/ December 31, 2018 Recognized Condition Condition Instruments Pledged* Net Amount Assets Futures $ 6,579,887 $ (4,822,376 ) $ 1,757,511 $ - $ - $ 1,757,511 Forwards 2,203,511 (2,203,511 ) - - - - Total assets $ 8,783,398 $ (7,025,887 ) $ 1,757,511 $ - $ - $ 1,757,511 Liabilities Futures $ (4,822,376 ) $ 4,822,376 $ - $ - $ - $ - Forwards (2,567,628 ) 2,203,511 (364,117 ) - - (364,117) Total liabilities $ (7,390,004 ) $ 7,025,887 $ (364,117 ) $ - $ - $ (364,117) Net fair value $ 1,393,394 * * In the event of default by the Partnership, MS&Co., the Partnership’s commodity futures broker and the sole counterparty to the Partnership’s non-exchange-traded
Gross Fair Values of Derivative Instruments of Futures and Option Contracts, as Separate Assets and Liabilities	The following table indicates the gross fair values of derivative instruments of futures, forward and option contracts held directly by the Partnership as separate assets and liabilities as of December 31, 2018. As of December 31, 2017, no derivative instruments were held directly by the Partnership. December 31, 2018 Assets Futures Contracts Currencies $ 14,578 Energy 5,628,038 Grains 157,540 Livestock 317,100 Metals 125,934 Softs 336,697 Total unrealized appreciation on open futures contracts 6,579,887 Liabilities Futures Contracts Currencies (1,159 ) Energy (3,938,643 ) Grains (66,943 ) Livestock (252,835 ) Metals (295,124 ) Softs (267,672 ) Total unrealized depreciation on open futures contracts (4,822,376 ) Net unrealized appreciation on open futures contracts $ 1,757,511 * Assets Forward Contracts Metals $ 2,203,511 Total unrealized appreciation on open forward contracts 2,203,511 Liabilities Forward Contracts Metals (2,567,628 ) Total unrealized depreciation on open forward contracts (2,567,628 ) Net unrealized depreciation on open forward contracts $ (364,117 ) ** Assets Options Purchased Energy $ 35,640 Grains 27,500 Livestock 19,620 Metals 222,454 Total options purchased $ 305,214 *** Liabilities Options Written Energy $ (34,760 ) Livestock (17,820 ) Metals (239,069 ) Softs (117,922 ) Total options written $ (409,571 ) **** * This amount is in “Net unrealized appreciation on open futures contracts” in the Statements of Financial Condition. ** This amount is in “Net unrealized depreciation on open forward contracts” in the Statements of Financial Condition. *** This amount is in “Options purchased, at fair value” in the Statements of Financial Condition. **** This amount is in “Options written, at fair value” in the Statements of Financial Condition.
Trading Gains and Losses, by Market Sector, on Derivative Instruments	The following table indicates the trading gains and losses, by market sector, on derivative instruments traded directly by the Partnership for the year ended December 31, 2018. During the years ended December 31, 2017 and 2016, no derivative instruments were traded directly by the Partnership. Sector 2018 Currencies $ (361,231) Energy 5,468,819 Grains 147,389 Interest Rates Non-U.S. 17,430 Livestock 570,324 Metals (865,848) Softs 1,148,562 Total $ 6,125,445 ***** *****

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Derivative Instrument Fair Value Based on Hierarchy	There were no direct investments at December 31 2017. December 31, 2018 Total Level 1 Level 2 Level 3 Assets Futures $ 6,579,887 $ 6,579,887 $ - $ - Forwards 2,203,511 - 2,203,511 - Options purchased 305,214 305,214 - - Total assets $ 9,088,612 $ 6,885,101 $ 2,203,511 $ - Liabilities Futures $ 4,822,376 $ 4,822,376 $ - $ - Forwards 2,567,628 - 2,567,628 - Options written 409,571 409,571 - - Total liabilities $ 7,799,575 $ 5,231,947 $ 2,567,628 $ -

Investment in the Funds (Tables

Investment in the Funds (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Investments [Abstract]
Assets, Liabilities and Partners' Capital of Funds	Summarized information reflecting the total assets, liabilities and partners’/members’ capital of the Funds is shown in the following tables: December 31, 2018 Total Assets Total Liabilities Total Capital Harbour Square Master $ 10,504,910 $ 2,532,233 $ 7,972,677 December 31, 2017 Total Assets Total Liabilities Total Capital MB Master $ 87,348,208 $ 9,978,681 $ 77,369,527
Net Investment Income (Loss), Trading Results and Net Income (Loss) of Funds	Summarized information reflecting the net investment income (loss), total trading results and net income (loss) of the Funds is shown in the following tables: For the year ended December 31, 2018 Net Investment Total Trading Income (Loss) Results Net Income (Loss) MB Master (a) $ 52,415 $ (951,117 ) $ (898,702 ) Harbour Square Master 244,803 416,882 661,685 For the year ended December 31, 2017 Net Investment Total Trading Income (Loss) Results Net Income (Loss) MB Master $ (523,086 ) $ (106,303 ) $ (629,389 ) (a)
Partnership's Investments in, and Partnership's Pro Rata Share of Results of Operations of Funds	Summarized information reflecting the Partnership’s investments in and the Partnership’s pro-rata share of the results of operations of the Funds is shown in the following tables: December 31, 2018 For the year ended December 31, 2018 % of Expenses Net Partners’ Fair Income Clearing Professional Income Investment Redemptions Funds Capital Value (Loss) Fees Fees (Loss) Objective Permitted MB Master (a) - $ - $ (384,502 ) $ 172,975 $ 30,426 $ (587,903 ) Commodity Portfolio Monthly Harbour Square Master 9.43% 5,489,732 571,941 74,003 41,460 456,478 Commodity Portfolio Monthly Total $ 5,489,732 $ 187,439 $ 246,978 $ 71,886 $ (131,425 ) December 31, 2017 For the year ended December 31, 2017 % of Expenses Net Partners’ Fair Income Clearing Professional Income Investment Redemptions Fund Capital Value (Loss) Fees Fees (Loss) Objective Permitted MB Master 99.95% $ 69,682,811 $ 564,298 $ 1,216,893 $ 56,368 $ (708,963 ) Commodity Portfolio Monthly Total $ 69,682,811 $ 564,298 $ 1,216,893 $ 56,368 $ (708,963 ) (a)

Financial Highlights (Tables)

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2018
Investment Company [Abstract]
Financial Highlights	Financial highlights for the limited partner Classes as a whole for the years ended December 31, 2018, 2017 and 2016 were as follows: 2018 2017 2016 Class A Class D** Class A Class A Per Redeemable Unit Performance (for a unit outstanding throughout the period/year):* Net realized and unrealized gains (losses) $ 115.36 $ 36.19 $ (1.95 ) $ 152.57 Net investment loss (80.34 ) (25.44 ) (68.11 ) (85.25 ) Increase (decrease) for the period/year 35.02 10.75 (70.06 ) 67.32 Net asset value per Redeemable Unit, beginning of period/year 1,265.64 1,000.00 1,335.70 1,268.38 Net asset value per Redeemable Unit, end of period/year $ 1,300.66 $ 1,010.75 $ 1,265.64 $ 1,335.70 2018 2017 2016 Class A Class D*** Class A Class A Ratios to Average Limited Partners’ Capital: Net investment loss**** (6.4 ) % (4.1 ) % (5.4 ) % (6.5 ) % Operating expenses 6.5 % 5.1 % 6.2 % 6.7 % Incentive fees 1.6 % 1.0 % - % - % Total expenses 8.1 % 6.1 % 6.2 % 6.7 % Total return: Total return before incentive fees 4.4 % 2.1 % (5.2 ) % 5.3 % Incentive fees (1.6 ) % (1.0 ) % - % - % Total return after incentive fees 2.8 % 1.1 % (5.2 ) % 5.3 % * Net investment loss per Redeemable Unit is calculated by dividing the interest income less total expenses by the average number of Redeemable Units outstanding during the period. The net realized and unrealized gains (losses) per Redeemable Unit is a balancing amount necessary to reconcile the change in net asset value per Redeemable Unit with the other per unit information. ** For the period from July 1, 2018 to December 31, 2018. *** Annualized and for the period from July 1, 2018 to December 31, 2018. **** Interest income less total expenses.

Organization - Additional Infor

Organization - Additional Information (Detail) - USD ($)	Sep. 06, 2005	Dec. 31, 2018	Dec. 31, 2017
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of units sold during initial offering period	11,925
Net asset value		$ 61,729,152	$ 77,823,076
Morgan Stanley Wealth Management [Member] | Class A [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ongoing selling agent fee		2.00%
Ongoing selling agent fee, monthly percentage		0.1667%
Morgan Stanley Wealth Management [Member] | Class D [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ongoing selling agent fee		0.75%
Ongoing selling agent fee, monthly percentage		0.0625%
Minimum [Member]
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Net asset value per unit liquidation circumstance		$ 400
Partnership liquidation date circumstance		Dec. 31, 2055
Net asset value		$ 1,000,000

Basis of Presentation and Sum_3

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Cash denominated in foreign currencies	$ (142,547)	$ 0
Cash denominated in foreign currencies, proceeds	141,947
Uncertain tax position	$ 0
Open tax year	2015 2016 2017 2018

Agreements - Additional Informa

Agreements - Additional Information (Detail) - USD ($)	Oct. 31, 2016	Nov. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Percentage of monthly General Partner fee			0.0833%
Percentage of General Partner fee			1.00%
Restricted cash held for margin			$ 7,608,136	$ 0
MS&Co. [Member]
Related Party Transaction [Line Items]
Percentage of allocable shares	80.00%		100.00%
Morgan Stanley Wealth Management [Member] | Class A [Member]
Related Party Transaction [Line Items]
Ongoing selling agent fee			2.00%
Morgan Stanley Wealth Management [Member] | Class D [Member]
Related Party Transaction [Line Items]
Ongoing selling agent fee			0.75%
Millburn [Member]
Related Party Transaction [Line Items]
Percentage of monthly management fee			0.1667%
Percentage of management fee			2.00%
Incentive fee, annual percent			20.00%
Ospraie [Member]
Related Party Transaction [Line Items]
Percentage of monthly management fee			0.125%
Percentage of management fee			1.50%
Incentive fee, annual percent			20.00%
Harbour Square [Member]
Related Party Transaction [Line Items]
Percentage of monthly management fee			0.0958%
Percentage of management fee			1.15%
Incentive fee, quarterly trading profits basis			20.00%
Aquantum [Member]
Related Party Transaction [Line Items]
Percentage of monthly management fee			0.1042%
Percentage of management fee			1.25%
Incentive fee, semi annual percent			20.00%
Aventis [Member]
Related Party Transaction [Line Items]
Percentage of monthly management fee		0.1042%
Percentage of management fee		1.25%
Incentive fee, quarterly trading profits basis		20.00%

Trading Activities - Additional

Trading Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018Contract	Dec. 31, 2017USD ($)
Derivative [Line Items]
Direct investments | $		$ 0
Futures [Member]
Derivative [Line Items]
Monthly average number of derivative contracts traded	4,091
Option [Member]
Derivative [Line Items]
Monthly average number of derivative contracts traded	1,205
Forwards [Member] | Metals [Member]
Derivative [Line Items]
Monthly average number of derivative contracts traded	1,035

Trading Activities - Summary of

Trading Activities - Summary of Valuation of Investments (Detail)	Dec. 31, 2018USD ($)
Derivative [Line Items]
Gross Amounts Recognized, Assets	$ 8,783,398
Gross Amounts Offset in the Statements of Financial Condition, Assets	(7,025,887)
Net Amounts Presented in the Statements of Financial Condition, Assets	1,757,511
Financial Instruments, Assets	0
Collateral Received/Pledged, Assets	0
Net Amount, Assets	1,757,511
Gross Amounts Recognized, Liabilities	(7,390,004)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	7,025,887
Net Amounts Presented in the Statements of Financial Condition, Liabilities	(364,117)
Financial Instruments, Liabilities	0
Collateral Received/Pledged, Liabilities	0
Net Amount, Liabilities	(364,117)
Net fair value	1,393,394
Futures [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	6,579,887
Gross Amounts Offset in the Statements of Financial Condition, Assets	(4,822,376)
Net Amounts Presented in the Statements of Financial Condition, Assets	1,757,511
Financial Instruments, Assets	0
Collateral Received/Pledged, Assets	0
Net Amount, Assets	1,757,511
Gross Amounts Recognized, Liabilities	(4,822,376)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	4,822,376
Financial Instruments, Liabilities	0
Collateral Received/Pledged, Liabilities	0
Forwards [Member]
Derivative [Line Items]
Gross Amounts Recognized, Assets	2,203,511
Gross Amounts Offset in the Statements of Financial Condition, Assets	(2,203,511)
Financial Instruments, Assets	0
Collateral Received/Pledged, Assets	0
Gross Amounts Recognized, Liabilities	(2,567,628)
Gross Amounts Offset in the Statements of Financial Condition, Liabilities	2,203,511
Net Amounts Presented in the Statements of Financial Condition, Liabilities	(364,117)
Financial Instruments, Liabilities	0
Collateral Received/Pledged, Liabilities	0
Net Amount, Liabilities	$ (364,117)

Trading Activities - Gross Fair

Trading Activities - Gross Fair Values of Derivative Instruments of Futures and Option Contracts, as Separate Assets and Liabilities (Detail)	Dec. 31, 2018USD ($)
Derivative [Line Items]
Total options purchased	$ 305,214
Total options written	(409,571)
Forwards [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	2,203,511
Total unrealized depreciation on open contracts	(2,567,628)
Net unrealized appreciation (depreciation) on open contracts	(364,117)
Energy [Member]
Derivative [Line Items]
Total options purchased	35,640
Total options written	(34,760)
Grains [Member]
Derivative [Line Items]
Total options purchased	27,500
Livestock [Member]
Derivative [Line Items]
Total options purchased	19,620
Total options written	(17,820)
Metals [Member]
Derivative [Line Items]
Total options purchased	222,454
Total options written	(239,069)
Metals [Member] | Forwards [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	2,203,511
Total unrealized depreciation on open contracts	(2,567,628)
Softs [Member]
Derivative [Line Items]
Total options written	(117,922)
Futures [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	6,579,887
Total unrealized depreciation on open contracts	(4,822,376)
Net unrealized appreciation (depreciation) on open contracts	1,757,511
Futures [Member] | Currencies [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	14,578
Total unrealized depreciation on open contracts	(1,159)
Futures [Member] | Energy [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	5,628,038
Total unrealized depreciation on open contracts	(3,938,643)
Futures [Member] | Grains [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	157,540
Total unrealized depreciation on open contracts	(66,943)
Futures [Member] | Livestock [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	317,100
Total unrealized depreciation on open contracts	(252,835)
Futures [Member] | Metals [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	125,934
Total unrealized depreciation on open contracts	(295,124)
Futures [Member] | Softs [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	336,697
Total unrealized depreciation on open contracts	$ (267,672)

Trading Activities - Trading Ga

Trading Activities - Trading Gains and Losses, by Market Sector, on Derivative Instruments (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)
Derivative [Line Items]
Trading gains and losses	$ 6,125,445
Currencies [Member]
Derivative [Line Items]
Trading gains and losses	(361,231)
Energy [Member]
Derivative [Line Items]
Trading gains and losses	5,468,819
Grains [Member]
Derivative [Line Items]
Trading gains and losses	147,389
Interest Rates Non-U.S. [Member]
Derivative [Line Items]
Trading gains and losses	17,430
Livestock [Member]
Derivative [Line Items]
Trading gains and losses	570,324
Metals [Member]
Derivative [Line Items]
Trading gains and losses	(865,848)
Softs [Member]
Derivative [Line Items]
Trading gains and losses	$ 1,148,562

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail)	Dec. 31, 2017USD ($)
Fair Value Disclosures [Abstract]
Direct investments	$ 0

Fair Value Measurements - Deriv

Fair Value Measurements - Derivative Instrument Fair Value Based on Hierarchy (Detail)	Dec. 31, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 9,088,612
Derivative liabilities	7,799,575
Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	6,579,887
Derivative liabilities	4,822,376
Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,203,511
Derivative liabilities	2,567,628
Option [Member] | Contracts Purchased [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	305,214
Option [Member] | Contracts Sold [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	409,571
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	6,885,101
Derivative liabilities	5,231,947
Level 1 [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	6,579,887
Derivative liabilities	4,822,376
Level 1 [Member] | Option [Member] | Contracts Purchased [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	305,214
Level 1 [Member] | Option [Member] | Contracts Sold [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	409,571
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,203,511
Derivative liabilities	2,567,628
Level 2 [Member] | Forwards [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	2,203,511
Derivative liabilities	$ 2,567,628

Investment in the Funds - Addit

Investment in the Funds - Additional Information (Detail)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
CMF Harbour Square Master Fund LLC [Member]
Investment [Line Items]
Percentage owned by partnership	68.70%
CMF Harbour Square Master Fund LLC [Member] | Maximum [Member]
Investment [Line Items]
Leverage applied to assets			150.00%
MB Master Fund L.P. [Member]
Investment [Line Items]
Percentage owned by partnership		89.30%

Investment in the Funds - Asset

Investment in the Funds - Assets, Liabilities and Partners' Capital of Funds (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investment Holdings [Line Items]
Total Assets	$ 61,729,152	$ 77,823,076
Total Liabilities	3,510,286	8,107,302
Total Capital	58,218,866	69,715,774	$ 103,433,044	$ 132,292,532
MB Master Fund L.P. [Member]
Investment Holdings [Line Items]
Total Assets		87,348,208
Total Liabilities		9,978,681
Total Capital		$ 77,369,527
CMF Harbour Square Master Fund LLC [Member]
Investment Holdings [Line Items]
Total Assets	10,504,910
Total Liabilities	2,532,233
Total Capital	$ 7,972,677

Investment in the Funds - Net I

Investment in the Funds - Net Investment Income (Loss), Trading Results and Net Income (Loss) of Funds (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
Net Investment Income (Loss)	$ (4,071,944)	$ (4,882,645)	$ (7,624,743)
Net income (loss)	1,846,114	(5,045,645)	$ 6,374,655
MB Master Fund L.P. [Member]
Investment Holdings [Line Items]
Net Investment Income (Loss)	52,415	(523,086)
Total Trading Results	(951,117)	(106,303)
Net income (loss)	(898,702)	$ (629,389)
CMF Harbour Square Master Fund LLC [Member]
Investment Holdings [Line Items]
Net Investment Income (Loss)	244,803
Total Trading Results	416,882
Net income (loss)	$ 661,685

Investment in the Funds - Partn

Investment in the Funds - Partnership's Investments in, and Partnership's Pro Rata Share of Results of Operations of Funds (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Holdings [Line Items]
% of Partners' Capital		9.43%	99.95%
Fair Value	[1]	$ 5,489,732	$ 69,682,811
Expenses, Clearing Fees		1,312,283	1,859,839	$ 2,389,918
Net income (loss)		1,846,114	$ (5,045,645)	$ 6,374,655
MB Master Fund L.P. [Member]
Investment Holdings [Line Items]
% of Partners' Capital			99.95%
Fair Value			$ 69,682,811
Income (Loss)		(951,117)	(106,303)
Net income (loss)		$ (898,702)	(629,389)
CMF Harbour Square Master Fund LLC [Member]
Investment Holdings [Line Items]
% of Partners' Capital		9.43%
Fair Value		$ 5,489,732
Income (Loss)		416,882
Net income (loss)		661,685
Investment In Funds [Member]
Investment Holdings [Line Items]
Fair Value		5,489,732	69,682,811
Income (Loss)		187,439	564,298
Expenses, Clearing Fees		246,978	1,216,893
Expenses, Professional Fees		71,886	56,368
Net income (loss)		(131,425)	$ (708,963)
Investment In Funds [Member] | MB Master Fund L.P. [Member] | Commodity [Member]
Investment Holdings [Line Items]
% of Partners' Capital			99.95%
Fair Value			$ 69,682,811
Income (Loss)		(384,502)	564,298
Expenses, Clearing Fees		172,975	1,216,893
Expenses, Professional Fees		30,426	56,368
Net income (loss)		$ (587,903)	$ (708,963)
Investment Objective		Commodity Portfolio	Commodity Portfolio
Redemptions Permitted		Monthly	Monthly
Investment In Funds [Member] | CMF Harbour Square Master Fund LLC [Member] | Commodity [Member]
Investment Holdings [Line Items]
% of Partners' Capital		9.43%
Fair Value		$ 5,489,732
Income (Loss)		571,941
Expenses, Clearing Fees		74,003
Expenses, Professional Fees		41,460
Net income (loss)		$ 456,478
Investment Objective		Commodity Portfolio
Redemptions Permitted		Monthly
[1]	Defined in Note 1.

Subscriptions, Distributions _2

Subscriptions, Distributions and Redemptions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)
Statement of Partners' Capital [Abstract]
Fee charged to limited partners	$ 0

Financial Highlights - Financia

Financial Highlights - Financial Highlights for Limited Partner Class (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class A [Member]
Per Redeemable Unit Performance (for a unit outstanding throughout the year):
Net asset value per Redeemable Unit, beginning of period/year	$ 1,265.64	$ 1,335.70
Net asset value per Redeemable Unit, end of period/year	1,300.66	1,265.64	$ 1,335.70
Class D [Member]
Per Redeemable Unit Performance (for a unit outstanding throughout the year):
Net asset value per Redeemable Unit, end of period/year	1,010.75
Limited Partners [Member] | Class A [Member]
Per Redeemable Unit Performance (for a unit outstanding throughout the year):
Net realized and unrealized gains (losses)	115.36	(1.95)	152.57
Net investment loss	(80.34)	(68.11)	(85.25)
Increase (decrease) for the period/year	35.02	(70.06)	67.32
Net asset value per Redeemable Unit, beginning of period/year	1,265.64	1,335.70	1,268.38
Net asset value per Redeemable Unit, end of period/year	$ 1,300.66	$ 1,265.64	$ 1,335.70
Ratios to Average Limited Partners' Capital:
Net investment loss	(6.40%)	(5.40%)	(6.50%)
Operating expenses	6.50%	6.20%	6.70%
Incentive fees	1.60%
Total expenses	8.10%	6.20%	6.70%
Total return:
Total return before incentive fees	4.40%	(5.20%)	5.30%
Incentive fees	(1.60%)
Total return after incentive fees	2.80%	(5.20%)	5.30%
Limited Partners [Member] | Class D [Member]
Per Redeemable Unit Performance (for a unit outstanding throughout the year):
Net realized and unrealized gains (losses)	$ 36.19
Net investment loss	(25.44)
Increase (decrease) for the period/year	10.75
Net asset value per Redeemable Unit, beginning of period/year	1,000
Net asset value per Redeemable Unit, end of period/year	$ 1,010.75	$ 1,000
Ratios to Average Limited Partners' Capital:
Net investment loss	(4.10%)
Operating expenses	5.10%
Incentive fees	1.00%
Total expenses	6.10%
Total return:
Total return before incentive fees	2.10%
Incentive fees	(1.00%)
Total return after incentive fees	1.10%

Financial Instrument Risks - Ad

Financial Instrument Risks - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Financial instruments maturity period	1 year

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail)	Jan. 01, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Percentage of monthly General Partner fee		0.0833%
Percentage of General Partner fee		1.00%
Subsequent Event [Member]
Subsequent Event [Line Items]
Percentage of monthly General Partner fee	0.0625%
Percentage of General Partner fee	0.75%