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QUARTERLY FINANCIAL DATA (Unaudited) (Summarized (Unaudited) Quarterly Financial Information) (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Income (Loss) | $ 329,664,541 | $ 270,615,213 | $ (253,296,939) | $ (247,892,752) | $ 294,578,790 | $ (78,243,696) | $ 647,936,099 | $ (171,852,015) | $ 99,090,063 | $ 692,419,178 | $ (1,269,295,429)
Total Expenses | 4,573,570 | 4,805,332 | 5,476,212 | 5,262,552 | 6,125,008 | 6,111,165 | 6,509,218 | 7,120,977 | 20,117,666 | 25,866,368 | 19,117,491
Net Income (Loss) | $ 325,090,971 | $ 265,809,881 | $ (258,773,151) | $ (253,155,304) | $ 288,453,782 | $ (84,354,861) | $ 641,426,881 | $ (178,972,992) | $ 78,972,397 | $ 666,552,810 | $ (1,288,412,920)
Net Income (Loss) per Share | $ 1.64 | $ 0.97 | $ (1.15) | $ (1.09) | $ 0.71 | $ (0.56) | $ 1.82 | $ (1.28) | $ 0.37 | $ 0.69 | $ (9.13)

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