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QUARTERLY FINANCIAL DATA (Unaudited) (Summarized (Unaudited) Quarterly Financial Information) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Income (Loss) | $ (760,851,950) | $ 51,601,604 | $ 256,619,443 | $ 174,518,482 | $ 329,664,541 | $ 270,615,213 | $ (253,296,939) | $ (247,892,752) | $ (278,112,421) | $ 99,090,063 | $ 692,419,178
Total Expenses | 3,032,675 | 3,117,304 | 3,391,637 | 3,620,608 | 4,573,570 | 4,805,332 | 5,476,212 | 5,262,552 | 13,162,224 | 20,117,666 | 25,866,368
Net income (loss) | $ (763,884,625) | $ 48,484,300 | $ 253,227,806 | $ 170,897,874 | $ 325,090,971 | $ 265,809,881 | $ (258,773,151) | $ (253,155,304) | $ (291,274,645) | $ 78,972,397 | $ 666,552,810
Net Income (Loss) per Share | $ (5.88) | $ 0.45 | $ 1.92 | $ 1.02 | $ 1.64 | $ 0.97 | $ (1.15) | $ (1.09) | $ (2.49) | $ 0.37 | $ 0.69

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