Derivative Instruments - Derivatives by Line Item in Statement of Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Futures, Forward, and Swap Contracts
Net gain (loss) from futures and forward currency trading
Total realized and changed in unrealized net gain (loss)	$ 795,051	$ (3,024,801)	$ (5,058,881)	$ 14,882,006
Futures Contracts
Net gain (loss) from futures and forward currency trading
Realized	(3,624,312)	1,523,704	(2,024,091)	16,121,355
Change in unrealized	3,972,712	(5,062,938)	(1,982,669)	2,220,457
Total realized and changed in unrealized net gain (loss)	348,400	(3,539,234)	(4,006,760)	18,341,812
Forward Contracts
Net gain (loss) from futures and forward currency trading
Realized	513,204	220,489	(1,134,274)	(163,404)
Change in unrealized	(526,989)	(398,093)	(515,103)	566,336
Total realized and changed in unrealized net gain (loss)	(13,785)	(177,604)	(1,649,377)	402,932
Swap Contracts
Net gain (loss) from futures and forward currency trading
Change in unrealized	460,436	692,037	597,256	(3,862,738)
Total realized and changed in unrealized net gain (loss)	$ 460,436	$ 692,037	$ 597,256	$ (3,862,738)