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Condensed Statements of Operations - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Gain (loss) on trading of commodity futures contracts:        
Realized gain (loss) on closed futures contracts $ 440,514,984 $ 33,275,021 $ 116,003,534 $ 60,350,020
Change in unrealized gain (loss) on open futures contracts 68,810,885 (267,890) 120,444,675 3,386,840
Dividend income 17,639 15,087 33,856 33,376
Interest income 321,493 28,052 516,091 81,298
ETF transaction fees 88,000 46,000 183,000 137,000
Total income (loss) 509,753,001 33,096,270 237,181,156 63,988,534
Expenses        
General Partner management fees (Note 3) 2,903,429 626,155 5,461,346 1,376,934
Professional fees 243,499 197,051 458,076 424,596
Brokerage commissions 1,094,815 146,990 2,282,032 411,154
Directors' fees and insurance 74,156 42,660 142,240 87,552
License fees 96,781 20,873 182,045 45,898
Registration fees 80,969 850 86,308 1,350
Total expenses 4,493,649 1,034,579 8,612,047 2,347,484
Net income (loss) $ 505,259,352 $ 32,061,691 $ 228,569,109 $ 61,641,050
Net income (loss) per limited partnership share $ 3.06 $ 2.25 $ (0.22) $ 3.63
Net income (loss) per weighted average limited partnership share $ 3.84 $ 2.15 $ 1.76 $ 3.61
Weighted average limited partnership shares outstanding 131,492,308 14,884,615 129,858,564 17,076,796