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Condensed Statements of Operations - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ (384,554,840) $ (693,928,121) $ 119,714,110 $ (577,924,587)
Change in unrealized gain (loss) on open futures contracts 303,367,830 21,060,881 270,039,300 141,505,556
Realized gain (loss) on short-term investments 0 (1,458) 0 (1,458)
Dividend income 560,858 17,611 1,481,741 51,467
Interest income 2,300,456 431,012 6,369,237 947,103
ETF transaction fees 82,000 87,000 236,000 270,000
Total income (loss) (78,243,696) (672,333,075) 397,840,388 (435,151,919)
Expenses        
General Partner management fees (Note 3) 3,619,261 2,845,896 11,462,884 8,307,242
Professional fees 643,479 245,263 1,989,912 703,339
Brokerage commissions 1,544,097 1,327,477 5,376,805 3,609,509
Directors' fees and insurance 95,863 75,988 277,504 218,228
License fees 120,642 94,863 382,096 276,908
Registration fees 87,823 81,859 252,159 168,167
Total expenses 6,111,165 4,671,346 19,741,360 13,283,393
Net income (loss) $ (84,354,861) $ (677,004,421) $ 378,099,028 $ (448,435,312)
Net income (loss) per limited partnership share (in dollars per share) $ (0.56) $ (5.36) $ (0.02) $ (5.58)
Net income (loss) per weighted average limited partnership share (in dollars per share) $ (0.28) $ (4.12) $ 1.14 $ (3.17)
Weighted average limited partnership shares outstanding (in shares) 303,886,957 164,201,087 331,528,832 141,431,868