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Condensed Statements of Operations - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Gain (loss) on trading of commodity futures contracts:    
Realized gain (loss) on closed futures contracts $ (78,689,338) $ (7,334,140)
Change in unrealized gain (loss) on open futures contracts (15,295,497) (106,553,296)
Realized gain (loss) on short-term investments (1,172) 0
Dividend income 19,279 17,851
Interest income 640,407 267,159
ETF transaction fees 84,000 25,000
Total income (loss) (93,242,321) (113,577,426)
Expenses    
General Partner management fees (Note 3) 739,810 726,158
Professional fees 360,450 50,547
Brokerage commissions 419,698 562,675
Directors' fees and insurance 15,207 21,523
License fees 18,495 18,154
Registration fees 82,458 100,645
Total expenses 1,636,118 1,479,702
Net income (loss) $ (94,878,439) $ (115,057,128)
Net income (loss) per limited partnership share $ (1.72) $ (2.05)
Net income (loss) per weighted average limited partnership share $ (1.44) $ (1.69)
Weighted average limited partnership shares outstanding 65,866,476 68,021,421