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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 70,673,279 $ 431,308,189 $ (1,300,519,431)
Change in unrealized gain (loss) on open futures contracts 6,489,790 249,798,620 29,109,870
Realized gain (loss) on short-term investments 0 14,302 (1,458)
Dividend income 3,417,005 2,090,136 75,426
Interest income [1] 18,149,989 8,864,931 1,692,164
ETF transaction fees 360,000 343,000 348,000
Total income (loss) 99,090,063 692,419,178 (1,269,295,429)
Expenses      
General Partner management fees (Note 3) 11,901,563 15,146,837 11,638,694
Professional fees 2,437,428 2,626,030 1,345,741
Brokerage commissions 4,675,687 6,875,314 5,196,820
Directors' fees and insurance 357,844 373,311 298,255
License fees 396,719 504,895 387,957
Registration fees 348,425 339,981 250,024
Total expenses 20,117,666 25,866,368 19,117,491
Net income (loss) $ 78,972,397 $ 666,552,810 $ (1,288,412,920)
Net income (loss) per limited partnership share $ 0.37 $ 0.69 $ (9.13)
Net income (loss) per weighted average limited partnership share $ 0.31 $ 2.07 $ (7.93)
Weighted average limited partnership shares outstanding 253,222,466 322,665,574 162,412,877
[1] Interest income does not exceed paid in kind of 5%.