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QUARTERLY FINANCIAL DATA (Unaudited) (Summarized (Unaudited) Quarterly Financial Information) (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information [Line Items]
Total Income (Loss)	$ 294,578,790	$ (78,243,696)	$ 647,936,099	$ (171,852,015)	$ (834,143,510)	$ (672,333,075)	$ 509,753,001	$ (272,571,845)	$ 692,419,178	$ (1,269,295,429)	$ (484,175,079)
Total Expenses	6,125,008	6,111,165	6,509,218	7,120,977	5,834,098	4,671,346	4,493,649	4,118,398	25,866,368	19,117,491	5,098,155
Net Income (Loss)	$ 288,453,782	$ (84,354,861)	$ 641,426,881	$ (178,972,992)	$ (839,977,608)	$ (677,004,421)	$ 505,259,352	$ (276,690,243)	$ 666,552,810	$ (1,288,412,920)	$ (489,273,234)
Net Income (Loss) per Share	$ 0.71	$ (0.56)	$ 1.82	$ (1.28)	$ (3.55)	$ (5.36)	$ 3.06	$ (3.28)	$ 0.69	$ (9.13)	$ (15.08)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51831255

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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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