Trading Advisor - Additional Information (Detail)	12 Months Ended
Dec. 31, 2018
Trading Advisors [Abstract]
Management fee, monthly basis	0.1458%
Management fee, annual basis	1.75%
Incentive fee, monthly trading profits basis	20.00%

Rate basis on trading profits experienced with respect to allocated net assets for incentive obligation payable in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner.

No definition available.

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Namespace Prefix:	mscg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration