Trading Activities - Gross Fair Values of Master's Derivative Instruments of Futures and Forward Contracts as Separate Assets and Liabilities (Detail) - CMF Winton Master L.P. [Member] - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Futures Contracts [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	$ 1,206,865	$ 6,198,249
Total unrealized depreciation on open contracts	(1,729,058)	(7,067,478)
Net unrealized appreciation (depreciation) on open contracts	(522,193)	(869,229)
Futures Contracts [Member] \| Currencies [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	10,628	882,389
Total unrealized depreciation on open contracts	(321,610)	(1,806,426)
Futures Contracts [Member] \| Energy [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	137,989	1,610,681
Total unrealized depreciation on open contracts	(347,643)	(132,370)
Futures Contracts [Member] \| Grains [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	169,780	248,161
Total unrealized depreciation on open contracts	(192,514)	(1,134,872)
Futures Contracts [Member] \| Indices [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	149,966	1,039,584
Total unrealized depreciation on open contracts	(57,245)	(513,537)
Futures Contracts [Member] \| Interest Rates U.S. [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	45,149	133,188
Total unrealized depreciation on open contracts	(10,438)	(1,154,102)
Futures Contracts [Member] \| Interest Rates Non-U.S. [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	528,635	119,694
Total unrealized depreciation on open contracts	(39,098)	(1,269,703)
Futures Contracts [Member] \| Livestock [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	40,993	2,270
Total unrealized depreciation on open contracts	(9,718)	(65,083)
Futures Contracts [Member] \| Metals [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	94,645	2,107,650
Total unrealized depreciation on open contracts	(710,313)	(29,852)
Futures Contracts [Member] \| Softs [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	29,080	54,632
Total unrealized depreciation on open contracts	(40,479)	(961,533)
Forward Contracts [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	433,883	2,919,920
Total unrealized depreciation on open contracts	(832,297)	(4,970,886)
Net unrealized appreciation (depreciation) on open contracts	(398,414)	(2,050,966)
Forward Contracts [Member] \| Currencies [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	228,000	1,138,504
Total unrealized depreciation on open contracts	(222,331)	(710,829)
Forward Contracts [Member] \| Metals [Member]
Derivative [Line Items]
Total unrealized appreciation on open contracts	205,883	1,781,416
Total unrealized depreciation on open contracts	$ (609,966)	$ (4,260,057)

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