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