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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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