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Statements of Operations - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Gain (loss) on trading of commodity futures contracts:      
Realized gain (loss) on closed futures contracts $ 1,603,334 $ 70,673,279 $ 431,308,189
Change in unrealized gain (loss) on open futures contracts (312,173,308) 6,489,790 249,798,620
Realized gain (loss) on short-term investments (3,070) 0 14,302
Dividend income 2,213,034 3,417,005 2,090,136
Interest income [1] 29,889,589 18,149,989 8,864,931
ETF transaction fees 358,000 360,000 343,000
Total income (loss) (278,112,421) 99,090,063 692,419,178
Expenses      
General Partner management fees (Note 3) 8,147,165 11,901,563 15,146,837
Professional fees 1,539,401 2,437,428 2,626,030
Brokerage commissions 2,538,611 4,675,687 6,875,314
Directors' fees and insurance 316,185 357,844 373,311
License fees 271,572 396,719 504,895
Registration fees 349,290 348,425 339,981
Total expenses 13,162,224 20,117,666 25,866,368
Net income (loss) $ (291,274,645) $ 78,972,397 $ 666,552,810
Net income (loss) per limited partnership share $ (2.49) $ 0.37 $ 0.69
Net income (loss) per weighted average limited partnership share $ (2.13) $ 0.31 $ 2.07
Weighted average limited partnership shares outstanding 137,006,575 253,222,466 322,665,574
[1] Interest income does not exceed paid in kind of 5%.