Investment in the Funds - Additional Information (Detail)			12 Months Ended
	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%