Statements Of Financial Highlights		3 Months Ended				9 Months Ended
		Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020	Sep. 30, 2019
Limited Partners [Member]
Ratios to average capital:
Net investment income (loss)	[1]	(3.28%)		(1.63%)		(2.71%)	(1.58%)
Total expenses	[1]	3.95%		3.87%		3.95%	3.87%
Profit share allocation	[2]	0.00%	[3]	0.11%	[3]	0.00%	0.35%
Total expenses and profit share allocation		3.95%		3.98%		3.95%	4.22%
Total return before profit share allocation	[2]	3.01%		0.57%		(12.83%)	1.92%
Less: profit share allocation	[2]	0.00%	[3]	0.11%	[3]	0.00%	0.35%
Total return after profit share allocation		3.01%		0.46%		(12.83%)	1.57%
Special Limited Partners [Member]
Ratios to average capital:
Net investment income (loss)	[1]	(0.34%)		1.20%		0.18%	1.32%
Total expenses	[1]	1.00%		1.02%		1.03%	0.96%
Profit share allocation	[2]	0.00%	[3]	0.00%	[3]	0.00%	0.00%
Total expenses and profit share allocation		1.00%		1.02%		1.03%	0.96%
Total return before profit share allocation	[2]	3.78%		1.28%		(10.90%)	4.18%
Less: profit share allocation	[2]	0.00%	[3]	0.00%	[3]	0.00%	0.00%
Total return after profit share allocation		3.78%		1.28%		(10.90%)	4.18%

[1] Annualized

[2] Not Annualized

[3] in instances of 0.00, value is less than 0.01 when rounded to two decimal places