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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 719,826,560 $ 440,514,984 $ 504,268,950 $ 116,003,534
Change in unrealized gain (loss) on open futures contracts (74,855,450) 68,810,885 (33,328,530) 120,444,675
Dividend income 572,471 17,639 920,883 33,856
Interest income 2,323,518 321,493 4,068,781 516,091
ETF transaction fees 69,000 88,000 154,000 183,000
Total income (loss) 647,936,099 509,753,001 476,084,084 237,181,156
Expenses        
General Partner management fees (Note 3) 3,924,293 2,903,429 7,843,623 5,461,346
Professional fees 673,118 243,499 1,346,433 458,076
Brokerage commissions 1,603,540 1,094,815 3,832,708 2,282,032
Directors' fees and insurance 94,090 74,156 181,641 142,240
License fees 130,810 96,781 261,454 182,045
Registration fees 83,367 80,969 164,336 86,308
Total expenses 6,509,218 4,493,649 13,630,195 8,612,047
Net income (loss) $ 641,426,881 $ 505,259,352 $ 462,453,889 $ 228,569,109
Net income (loss) per limited partnership share (in dollars per share) $ 1.82 $ 3.06 $ 0.54 $ (0.22)
Net income (loss) per weighted average limited partnership share (in dollars per share) $ 2.03 $ 3.84 $ 1.34 $ 1.76
Weighted average limited partnership shares outstanding (in shares) 316,056,044 131,492,308 345,501,648 129,858,564