Schedule of Investments (Unaudited) - Futures Contracts - USD ($)		Jun. 30, 2016	Dec. 31, 2015
Total Commodity Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(17.68%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (351,279,993)
Notional Market Value			$ 1,987,153,877
CBOT Corn (6,348 contracts, settlement date September 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.36%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (7,213,436)
Notional Market Value			$ 119,104,350
CBOT Soybean (2,828 contracts, settlement date November 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.09%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (1,789,744)
Notional Market Value			$ 124,820,850
CBOT Wheat (4,833 contracts, settlement date July 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.60%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (11,964,777)
Notional Market Value			$ 116,777,362
COMEX Gold (1,609 contracts, settlement date August 29, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.35%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (6,963,235)
Notional Market Value			$ 170,940,160
COMEX Silver (607 contracts, settlement date March 29, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.06%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (1,273,926)
Notional Market Value			$ 41,892,105
ICE-UK Brent Crude (4,973 contracts, settlement date October 31, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(2.72%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (54,007,216)
Notional Market Value			$ 220,801,200
LME Aluminum (2,372 contracts, settlement date November 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.23%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (4,605,087)
Notional Market Value			$ 91,292,350
LME Copper (738 contracts, settlement date February 15, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			0.12%
Unrealized Appreciation/ (Depreciation)	[1]		$ 2,462,856
Notional Market Value			$ 86,922,563
LME Zinc (2,225 contracts, settlement date February 15, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(1.63%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (32,303,825)
Notional Market Value			$ 89,236,406
NYB-ICE Sugar (8,126 contracts, settlement date September 30, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			0.97%
Unrealized Appreciation/ (Depreciation)	[1]		$ 19,297,530
Notional Market Value			$ 133,604,442
NYMEX Natural Gas (4,663 contracts, settlement date August 29, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.83%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (16,429,233)
Notional Market Value			$ 117,554,230
NYMEX NY Harbor ULSD (4,169 contracts, settlement date May 31, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(5.93%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (117,899,929)
Notional Market Value			$ 212,814,109
NYMEX RBOB Gasoline (4,557 contracts, settlement date November 30, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(0.63%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (12,489,060)
Notional Market Value			$ 239,893,240
NYMEX WTI Crude (5,803 contracts, settlement date February 22, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity			(5.34%)
Unrealized Appreciation/ (Depreciation)	[1]		$ (106,100,911)
Notional Market Value			$ 221,500,510
Total Commodity Futures Contracts Purchased [Member] | CBOT Corn (7,180 contracts, settlement date September 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		(0.43%)
Unrealized Appreciation/ (Depreciation)	[1]	$ (11,181,678)
Notional Market Value		$ 131,214,500
Total Commodity Futures Contracts Purchased [Member] | CBOT Soybean (3,197 contracts, settlement date November 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		1.47%
Unrealized Appreciation/ (Depreciation)	[1]	$ 37,884,641
Notional Market Value		$ 184,347,012
Total Commodity Futures Contracts Purchased [Member] | CBOT Wheat (4,853 contracts, settlement date July 14, 2017) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		(0.61%)
Unrealized Appreciation/ (Depreciation)	[1]	$ (15,641,081)
Notional Market Value		$ 121,810,300
Total Commodity Futures Contracts Purchased [Member] | COMEX Gold (1,821 contracts, settlement date August 29, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		1.35%
Unrealized Appreciation/ (Depreciation)	[1]	$ 34,821,216
Notional Market Value		$ 240,481,260
Total Commodity Futures Contracts Purchased [Member] | COMEX Silver (682 contracts, settlement date January 27, 2017) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		0.46%
Unrealized Appreciation/ (Depreciation)	[1]	$ 11,797,879
Notional Market Value		$ 63,824,970
Total Commodity Futures Contracts Purchased [Member] | ICE-UK Brent Crude (5,627 contracts, settlement date October 31, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		(0.55%)
Unrealized Appreciation/ (Depreciation)	[1]	$ (14,269,556)
Notional Market Value		$ 287,314,620
Total Commodity Futures Contracts Purchased [Member] | LME Aluminum (2,686 contracts, settlement date November 14, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		0.11%
Unrealized Appreciation/ (Depreciation)	[1]	$ 2,931,781
Notional Market Value		$ 110,948,588
Total Commodity Futures Contracts Purchased [Member] | LME Copper (835 contracts, settlement date August 15, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		0.18%
Unrealized Appreciation/ (Depreciation)	[1]	$ 4,593,525
Notional Market Value		$ 101,181,125
Total Commodity Futures Contracts Purchased [Member] | LME Zinc (2,455 contracts, settlement date December 19, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		1.19%
Unrealized Appreciation/ (Depreciation)	[1]	$ 30,685,007
Notional Market Value		$ 129,608,656
Total Commodity Futures Contracts Purchased [Member] | NYB-ICE Sugar (9,198 contracts, settlement date September 30, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		2.80%
Unrealized Appreciation/ (Depreciation)	[1]	$ 72,385,426
Notional Market Value		$ 209,434,781
Total Commodity Futures Contracts Purchased [Member] | NYMEX Natural Gas (5,275 contracts, settlement date August 29, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		0.27%
Unrealized Appreciation/ (Depreciation)	[1]	$ 7,000,424
Notional Market Value		$ 153,924,500
Total Commodity Futures Contracts Purchased [Member] | NYMEX NY Harbor ULSD (4,484 contracts, settlement date May 31, 2017) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		0.00%
Unrealized Appreciation/ (Depreciation)	[1]	$ (23,018)
Notional Market Value		$ 299,290,858
Total Commodity Futures Contracts Purchased [Member] | NYMEX RBOB Gasoline (5,155 contracts, settlement date November 30, 2016) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		0.53%
Unrealized Appreciation/ (Depreciation)	[1]	$ 13,889,128
Notional Market Value		$ 298,264,176
Total Commodity Futures Contracts Purchased [Member] | NYMEX WTI Crude (4,908 contracts, settlement date February 21, 2017) [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		1.73%
Unrealized Appreciation/ (Depreciation)	[1]	$ 44,826,099
Notional Market Value		$ 253,301,880
Total Commodity Futures Contracts Purchased [Member] | Total Commodity Futures Contracts [Member]
Schedule of Investments [Line Items]
Unrealized Appreciation/(Depreciation) as a Percentage of Shareholders' Equity		8.50%
Unrealized Appreciation/ (Depreciation)	[1]	$ 219,699,793
Notional Market Value		$ 2,584,947,226

[1] Unrealized appreciation/(depreciation) is presented above, net by contract.