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.