Nuveen Diversified Commodity Fund (CFD) 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 11, 2015	Jun. 30, 2014
Document Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Trading Symbol	CFD
Entity Registrant Name	NUVEEN DIVERSIFIED COMMODITY FUND
Entity Central Index Key	1345801
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		9,047,040
Entity Public Float			$149,691,186

SCHEDULE_OF_INVESTMENTS

SCHEDULE OF INVESTMENTS (USD $)	12 Months Ended
	Dec. 31, 2014
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	$112,700,000
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	112,651,962
Repurchase Agreements, at Fair Value	1,085,421
Short-term investments, at Fair Value	113,737,383
Repurchase Agreements
Schedule of Investments [Line Items]
Repurchase Agreements, Principal amount	1,085,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Repurchase Agreements, Maturity	2-Jan-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	N/A
Repurchase Agreements, at Fair Value	1,085,421
Short-term investments, at Fair Value	1,085,421
U.S. Treasury Bills | 1/08/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	4,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	8-Jan-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	3,999,992
U.S. Treasury Bills | 2/05/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	6,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	5-Feb-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	5,999,856
U.S. Treasury Bills | 3/05/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	10,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	5-Mar-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	9,999,700
U.S. Treasury Bills | 4/02/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	15,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	2-Apr-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	14,998,500
U.S. Treasury Bills | 4/30/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	18,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	30-Apr-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	17,997,354
U.S. Treasury Bills | 5/28/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	18,700,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	28-May-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	18,695,063
U.S. Treasury Bills | 6/25/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	5,500,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	25-Jun-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	5,497,674
U.S. Treasury Bills | 7/23/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	18,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	23-Jul-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	17,988,642
U.S. Treasury Bills | 9/17/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	8,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	17-Sep-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	7,990,256
U.S. Treasury Bills | 10/15/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	2,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	15-Oct-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	1,997,180
U.S. Treasury Bills | 11/12/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	6,000,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	12-Nov-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	5,990,844
U.S. Treasury Bills | 12/10/15
Schedule of Investments [Line Items]
Financial Instruments Owned Us Government and Agency Obligations, Principal Amount	1,500,000
Financial Instruments Owned Us Government and Agency Obligations, Interest Rate	0.00%
Financial Instruments Owned Us Government and Agency Obligations, Maturity Date	10-Dec-15
Financial Instruments Owned Us Government and Agency Obligations, Credit Ratings	Aaa	[1]
Financial Instruments, Owned, US Government and Agency Obligations, at Fair Value	$1,496,901
[1]	Ratings (not covered by the report of independent registered public accounting firm): Using the highest of Standard & Poor's Group, Moody's Investors Service, Inc. or Fitch, Inc. rating.

SCHEDULE_OF_INVESTMENTS_Parent

SCHEDULE OF INVESTMENTS (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014
Schedule of Investments [Line Items]
Investment cost	$113,736,191
U.S. Treasury Bills
Schedule of Investments [Line Items]
Investment cost	112,650,770
Repurchase Agreements
Schedule of Investments [Line Items]
Investment cost	1,085,421
Investment agreement name of party	State Street Bank
Date of repurchase agreement	31-Dec-14
Repurchase price of agreement	1,085,421
Securities received as collateral face amount	795,000
Securities received as collateral, interest rate	8.00%
Securities received as collateral, maturity date	15-Nov-21
Securities received as collateral, value	$1,113,007

SCHEDULE_OF_INVESTMENTS_IN_DER

SCHEDULE OF INVESTMENTS IN DERIVATIVES (USD $)	12 Months Ended
	Dec. 31, 2014
	Contract
Derivative [Line Items]
Futures Options, Value	($296,907)
Futures Contracts
Derivative [Line Items]
Number of Contracts	2,585	[1]
Notional Amount at Value	123,044,972	[1]
Unrealized Appreciation (Depreciation)	-10,837,633	[2]
Futures Contracts | Energy
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-8,463,049	[2]
Futures Contracts | Energy | ICE Brent Crude Oil Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	102	[1]
Notional Amount at Value	5,847,660	[1]
Unrealized Appreciation (Depreciation)	-718,110	[2]
Futures Contracts | Energy | ICE Brent Crude Oil Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	100	[1]
Notional Amount at Value	5,821,000	[1]
Unrealized Appreciation (Depreciation)	-1,682,272	[2]
Futures Contracts | Energy | NYMEX Crude Oil Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	68	[1]
Notional Amount at Value	3,622,360	[1]
Unrealized Appreciation (Depreciation)	-377,800	[2]
Futures Contracts | Energy | NYMEX Crude Oil Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	66	[1]
Notional Amount at Value	3,544,200	[1]
Unrealized Appreciation (Depreciation)	-755,150	[2]
Futures Contracts | Energy | Aggregate Crude Oil
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-3,533,332	[2]
Futures Contracts | Energy | ICE Gas Oil Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	20	[1]
Notional Amount at Value	1,042,500	[1]
Unrealized Appreciation (Depreciation)	-110,500	[2]
Futures Contracts | Energy | Nymex NY Harbor ULSD Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	32	[1]
Notional Amount at Value	2,464,358	[1]
Unrealized Appreciation (Depreciation)	-703,568	[2]
Futures Contracts | Energy | Nymex NY Harbor ULSD Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	17	[1]
Notional Amount at Value	1,297,481	[1]
Unrealized Appreciation (Depreciation)	-300,833	[2]
Futures Contracts | Energy | Aggregate Heating Oil
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-1,114,901	[2]
Futures Contracts | Energy | NYMEX Natural Gas Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	158	[1]
Notional Amount at Value	4,564,620	[1]
Unrealized Appreciation (Depreciation)	-1,895,660	[2]
Futures Contracts | Energy | NYMEX Natural Gas Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	87	[1]
Notional Amount at Value	2,519,520	[1]
Unrealized Appreciation (Depreciation)	-905,560	[2]
Futures Contracts | Energy | Aggregate Natural Gas
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-2,801,220	[2]
Futures Contracts | Energy | NYMEX Gasoline Rbob Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	24	[1]
Notional Amount at Value	1,483,877	[1]
Unrealized Appreciation (Depreciation)	-556,279	[2]
Futures Contracts | Energy | NYMEX Gasoline Rbob Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	21	[1]
Notional Amount at Value	1,326,616	[1]
Unrealized Appreciation (Depreciation)	-457,317	[2]
Futures Contracts | Energy | Aggregate Unleaded Gas
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-1,013,596	[2]
Futures Contracts | Industrial Metals
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-1,085,488	[2]
Futures Contracts | Industrial Metals | LME Primary Aluminum Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-01
Number of Contracts	143	[1]
Notional Amount at Value	6,555,656	[1]
Unrealized Appreciation (Depreciation)	-373,981	[2]
Futures Contracts | Industrial Metals | LME Primary Aluminum Futures 1
Derivative [Line Items]
Contract Position	Short	[3]
Contract Expiration	2015-01
Number of Contracts	-7	[1]
Notional Amount at Value	-320,906	[1]
Unrealized Appreciation (Depreciation)	11,750	[2]
Futures Contracts | Industrial Metals | Aluminum
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-362,231	[2]
Futures Contracts | Industrial Metals | COMEX Copper Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	32	[1]
Notional Amount at Value	2,260,400	[1]
Unrealized Appreciation (Depreciation)	-165,888	[2]
Futures Contracts | Industrial Metals | COMEX Copper Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-05
Number of Contracts	9	[1]
Notional Amount at Value	635,287	[1]
Unrealized Appreciation (Depreciation)	-6,638	[2]
Futures Contracts | Industrial Metals | LME Copper Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-01
Number of Contracts	61	[1]
Notional Amount at Value	9,682,225	[1]
Unrealized Appreciation (Depreciation)	-262,900	[2]
Futures Contracts | Industrial Metals | LME Copper Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	21	[1]
Notional Amount at Value	3,311,700	[1]
Unrealized Appreciation (Depreciation)	-179,550	[2]
Futures Contracts | Industrial Metals | Lme Copper Futures 2
Derivative [Line Items]
Contract Position	Short	[3]
Contract Expiration	2015-01
Number of Contracts	-23	[1]
Notional Amount at Value	-3,650,675	[1]
Unrealized Appreciation (Depreciation)	178,975	[2]
Futures Contracts | Industrial Metals | Lme Copper Futures 3
Derivative [Line Items]
Contract Position	Short	[3]
Contract Expiration	2015-03
Number of Contracts	-1	[1]
Notional Amount at Value	-157,700	[1]
Unrealized Appreciation (Depreciation)	500	[2]
Futures Contracts | Industrial Metals | Aggregate Copper
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-435,501	[2]
Futures Contracts | Industrial Metals | LME Nickel Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-01
Number of Contracts	22	[1]
Notional Amount at Value	1,991,616	[1]
Unrealized Appreciation (Depreciation)	-163,284	[2]
Futures Contracts | Industrial Metals | LME Nickel Futures 1
Derivative [Line Items]
Contract Position	Short	[3]
Contract Expiration	2015-01
Number of Contracts	-1	[1]
Notional Amount at Value	-90,528	[1]
Unrealized Appreciation (Depreciation)	72	[2]
Futures Contracts | Industrial Metals | Aggregate Nickel
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-163,212	[2]
Futures Contracts | Industrial Metals | LME Zinc Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-01
Number of Contracts	37	[1]
Notional Amount at Value	2,005,400	[1]
Unrealized Appreciation (Depreciation)	-21,506	[2]
Futures Contracts | Industrial Metals | LME Zinc Futures 1
Derivative [Line Items]
Contract Position	Short	[3]
Contract Expiration	2015-01
Number of Contracts	-2	[1]
Notional Amount at Value	-108,400	[1]
Unrealized Appreciation (Depreciation)	400	[2]
Futures Contracts | Industrial Metals | Aggregate Zinc
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-21,106	[2]
Futures Contracts | Industrial Metals | LME Lead Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-01
Number of Contracts	25	[1]
Notional Amount at Value	1,156,875	[1]
Unrealized Appreciation (Depreciation)	-103,438	[2]
Futures Contracts | Agricultural
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	301,376	[2]
Futures Contracts | Agricultural | CBOT Corn Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	295	[1]
Notional Amount at Value	5,855,750	[1]
Unrealized Appreciation (Depreciation)	169,587	[2]
Futures Contracts | Agricultural | CBOT Soybean Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	165	[1]
Notional Amount at Value	8,443,875	[1]
Unrealized Appreciation (Depreciation)	-5,703	[2]
Futures Contracts | Agricultural | CBOT Wheat Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	44	[1]
Notional Amount at Value	1,297,450	[1]
Unrealized Appreciation (Depreciation)	136,888	[2]
Futures Contracts | Agricultural | KCBT Wheat Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	127	[1]
Notional Amount at Value	3,978,275	[1]
Unrealized Appreciation (Depreciation)	114,287	[2]
Futures Contracts | Agricultural | Aggregate Wheat
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	251,175	[2]
Futures Contracts | Agricultural | CBOT Soybean Meal Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	102	[1]
Notional Amount at Value	3,545,520	[1]
Unrealized Appreciation (Depreciation)	-59,239	[2]
Futures Contracts | Agricultural | CBOT Soybean Meal Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-05
Number of Contracts	12	[1]
Notional Amount at Value	409,080	[1]
Unrealized Appreciation (Depreciation)	-14,280	[2]
Futures Contracts | Agricultural | Aggregate Soybean Meal
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-73,519	[2]
Futures Contracts | Agricultural | CBOT Soybean Oil Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	78	[1]
Notional Amount at Value	1,504,152	[1]
Unrealized Appreciation (Depreciation)	-37,326	[2]
Futures Contracts | Agricultural | CBOT Soybean Oil Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-05
Number of Contracts	11	[1]
Notional Amount at Value	213,510	[1]
Unrealized Appreciation (Depreciation)	-2,838	[2]
Futures Contracts | Agricultural | Aggregate Soybean Oil
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-40,164	[2]
Futures Contracts | Precious Metals
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-311,785	[2]
Futures Contracts | Precious Metals | CEC Gold Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	120	[1]
Notional Amount at Value	14,209,200	[1]
Unrealized Appreciation (Depreciation)	-177,600	[2]
Futures Contracts | Precious Metals | CEC Silver Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	44	[1]
Notional Amount at Value	3,431,780	[1]
Unrealized Appreciation (Depreciation)	-144,100	[2]
Futures Contracts | Precious Metals | NYMEX Platinum Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-04
Number of Contracts	17	[1]
Notional Amount at Value	1,028,075	[1]
Unrealized Appreciation (Depreciation)	-10,945	[2]
Futures Contracts | Precious Metals | NYMEX Palladium Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	7	[1]
Notional Amount at Value	558,880	[1]
Unrealized Appreciation (Depreciation)	20,860	[2]
Futures Contracts | Foods And Fibers
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-566,098	[2]
Futures Contracts | Foods And Fibers | ICE Cotton Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	51	[1]
Notional Amount at Value	1,536,885	[1]
Unrealized Appreciation (Depreciation)	-69,945	[2]
Futures Contracts | Foods And Fibers | ICE Sugar Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	124	[1]
Notional Amount at Value	2,016,538	[1]
Unrealized Appreciation (Depreciation)	-261,700	[2]
Futures Contracts | Foods And Fibers | Ice Sugar Futures One
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-05
Number of Contracts	12	[1]
Notional Amount at Value	200,525	[1]
Unrealized Appreciation (Depreciation)	-31,718	[2]
Futures Contracts | Foods And Fibers | Aggregate Sugar
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-293,418	[2]
Futures Contracts | Foods And Fibers | ICE Coffee C Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	20	[1]
Notional Amount at Value	1,249,500	[1]
Unrealized Appreciation (Depreciation)	-163,125	[2]
Futures Contracts | Foods And Fibers | LIFFE Coffee Robusta Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	58	[1]
Notional Amount at Value	1,111,280	[1]
Unrealized Appreciation (Depreciation)	-20,370	[2]
Futures Contracts | Foods And Fibers | Aggregate Coffee
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-183,495	[2]
Futures Contracts | Foods And Fibers | ICE Cocoa Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	20	[1]
Notional Amount at Value	582,000	[1]
Unrealized Appreciation (Depreciation)	-15,080	[2]
Futures Contracts | Foods And Fibers | Ice Cocoa One Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-05
Number of Contracts	7	[1]
Notional Amount at Value	202,440	[1]
Unrealized Appreciation (Depreciation)	-4,160	[2]
Futures Contracts | Foods And Fibers | Aggregate Cocoa
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-19,240	[2]
Futures Contracts | Livestock
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-712,589	[2]
Futures Contracts | Livestock | CME Live Cattle Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	128	[1]
Notional Amount at Value	8,373,760	[1]
Unrealized Appreciation (Depreciation)	-265,818	[2]
Futures Contracts | Livestock | Cme Live Cattle Futures One
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-04
Number of Contracts	16	[1]
Notional Amount at Value	1,039,360	[1]
Unrealized Appreciation (Depreciation)	-39,760	[2]
Futures Contracts | Livestock | Aggregate Live Cattle
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-305,578	[2]
Futures Contracts | Livestock | CME Lean Hog Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-02
Number of Contracts	84	[1]
Notional Amount at Value	2,728,320	[1]
Unrealized Appreciation (Depreciation)	-258,961	[2]
Futures Contracts | Livestock | CME Lean Hog Futures 1
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-04
Number of Contracts	10	[1]
Notional Amount at Value	333,100	[1]
Unrealized Appreciation (Depreciation)	-12,300	[2]
Futures Contracts | Livestock | Aggregate Lean Hogs
Derivative [Line Items]
Unrealized Appreciation (Depreciation)	-271,261	[2]
Futures Contracts | Livestock | CME Feeder Cattle Futures
Derivative [Line Items]
Contract Position	Long	[3]
Contract Expiration	2015-03
Number of Contracts	22	[1]
Notional Amount at Value	2,390,575	[1]
Unrealized Appreciation (Depreciation)	-135,750	[2]
Call Options | Short
Derivative [Line Items]
Number of Contracts	-1,257
Futures Options, Value	-296,907
Call Options | Energy | Short
Derivative [Line Items]
Futures Options, Value	-9,951
Call Options | Energy | ICE Brent Crude Oil Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-91
Strike Price	70.5
Futures Options, Value	-2,730
Call Options | Energy | ICE Brent Crude Oil Futures 1 | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-10
Strike Price	74
Futures Options, Value	-200
Call Options | Energy | NYMEX Crude Oil Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01
Number of Contracts	-61
Strike Price	63.5
Futures Options, Value	-4,270
Call Options | Energy | NYMEX Crude Oil Futures 1 | Short
Derivative [Line Items]
Contract Expiration	2015-01
Number of Contracts	-6
Strike Price	74
Futures Options, Value	-60
Call Options | Energy | Aggregate Crude Oil | Short
Derivative [Line Items]
Futures Options, Value	-7,260
Call Options | Energy | Nymex NY Harbor ULSD Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01
Number of Contracts	-32
Strike Price	2.65
Futures Options, Value	-134
Call Options | Energy | NYMEX Natural Gas Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01
Number of Contracts	-123
Strike Price	4,850
Futures Options, Value	-2,460
Call Options | Energy | NYMEX Gasoline Rbob Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01
Number of Contracts	-23
Strike Price	22,800
Futures Options, Value	-97
Call Options | Industrial Metals | Short
Derivative [Line Items]
Futures Options, Value	-132
Call Options | Industrial Metals | LME Primary Aluminum Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01	[4]
Number of Contracts	-68	[4]
Strike Price	2,075	[4]
Call Options | Industrial Metals | LME Copper Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01	[4]
Number of Contracts	-38	[4]
Strike Price	6,800	[4]
Futures Options, Value	-19	[4]
Call Options | Industrial Metals | LME Nickel Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01	[4]
Number of Contracts	-11	[4]
Strike Price	17,500	[4]
Futures Options, Value	-2	[4]
Call Options | Industrial Metals | LME Zinc Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01	[4]
Number of Contracts	-17	[4]
Strike Price	2,300	[4]
Futures Options, Value	-111	[4]
Call Options | Industrial Metals | LME Lead Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01	[4]
Number of Contracts	-13	[4]
Strike Price	2,100	[4]
Call Options | Agricultural | Short
Derivative [Line Items]
Futures Options, Value	-239,767
Call Options | Agricultural | CBOT Corn Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-147
Strike Price	410
Futures Options, Value	-76,256
Call Options | Agricultural | CBOT Soybean Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-82
Strike Price	1,080
Futures Options, Value	-60,475
Call Options | Agricultural | Aggregate Wheat | Short
Derivative [Line Items]
Futures Options, Value	-83,881
Call Options | Agricultural | CBOT Soybean Meal Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-57
Strike Price	400
Futures Options, Value	-15,105
Call Options | Agricultural | CBOT Soybean Oil Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-45
Strike Price	355
Futures Options, Value	-4,050
Call Options | Agricultural | CBOT Wheat Futures 1 | Short | Minimum
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-25
Strike Price	620
Futures Options, Value	-32,188
Call Options | Agricultural | CBOT Wheat Futures 1 | Short | Maximum
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-22
Strike Price	580
Futures Options, Value	-30,525
Call Options | Agricultural | Cbot Wheat Futures 2 | Short | Minimum
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-21
Strike Price	640
Futures Options, Value	-17,981
Call Options | Agricultural | Cbot Wheat Futures 2 | Short | Maximum
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-17
Strike Price	710
Futures Options, Value	-3,187
Call Options | Precious Metals | Short
Derivative [Line Items]
Futures Options, Value	-24,120
Call Options | Precious Metals | CEC Gold Futures | Short
Derivative [Line Items]
Contract Expiration	2015-01
Number of Contracts	-60
Strike Price	1,280
Futures Options, Value	-9,600
Call Options | Precious Metals | CEC Silver Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-22
Strike Price	1,800
Futures Options, Value	-14,520
Call Options | Foods And Fibers | Short
Derivative [Line Items]
Futures Options, Value	-9,847
Call Options | Foods And Fibers | ICE Cotton Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-26
Strike Price	68
Futures Options, Value	-1,430
Call Options | Foods And Fibers | ICE Sugar Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-68
Strike Price	17.75
Futures Options, Value	-1,523
Call Options | Foods And Fibers | ICE Coffee C Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-19
Strike Price	210
Futures Options, Value	-5,914
Call Options | Foods And Fibers | ICE Cocoa Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-14
Strike Price	3,250
Futures Options, Value	-980
Call Options | Livestock | Short
Derivative [Line Items]
Futures Options, Value	-13,090
Call Options | Livestock | CME Live Cattle Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-92
Strike Price	177
Futures Options, Value	-10,120
Call Options | Livestock | CME Lean Hog Futures | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-16
Strike Price	95
Futures Options, Value	-800
Call Options | Livestock | CME Lean Hog Futures 1 | Short
Derivative [Line Items]
Contract Expiration	2015-02
Number of Contracts	-31
Strike Price	93
Futures Options, Value	-2,170
Call Options | Livestock | Aggregate Lean Hogs | Short
Derivative [Line Items]
Futures Options, Value	($2,970)
[1]	Total number of contracts and notional amount at value include the net effect of LME short futures positions, when applicable.
[2]	The gross unrealized appreciation (depreciation) on futures contracts is $633,319 and $(11,470,952), respectively.
[3]	The Fund expects to invest only in long futures contracts. Some short futures positions arise in futures contracts traded on the London Metal Exchange ("LME") solely as the result of closing existing long LME futures positions. For every short LME futures contract outstanding, the Fund had previously entered into a long LME futures contract. The London Clearing House is the counterparty for both the long and short position.
[4]	For fair value measurement disclosure purposes, these Call Options Written are classified as Level 2. See Notes to Financial Statements, Note 2 - Summary of Significant Accounting Policies, Investment Valuation and Fair Value Measurements for more information.

SCHEDULE_OF_INVESTMENTS_IN_DER1

SCHEDULE OF INVESTMENTS IN DERIVATIVES (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Total call options written outstanding - premiums received	$952,693	$777,236
Unrealized appreciation on futures contracts	633,319	3,905,844
Unrealized depreciation on futures contracts	11,470,952	2,026,830
Call Options | Short
Derivative [Line Items]
Total call options written outstanding - premiums received	$952,693	$777,236	$974,047

STATEMENTS_OF_FINANCIAL_CONDIT

STATEMENTS OF FINANCIAL CONDITION (USD $)	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Short-term investments, at value (cost $113,736,191 and $141,217,188, respectively)	$113,737,383	$141,238,384
Deposits with brokers	21,197,009	25,753,763
Unrealized appreciation on futures contracts	633,319	3,905,844
Total assets	135,567,711	170,897,991
LIABILITIES
Call options written, at value (premiums received $952,693 and $777,236, respectively)	296,907	1,029,767
Unrealized depreciation on futures contracts	11,470,952	2,026,830
Payable for shares repurchased		151,538
Accrued expenses:
Management fees	138,599	178,826
Independent Committee fees	13,103	12,935
Other	450,146	351,411
Total liabilities	12,369,707	3,751,307
SHAREHOLDERS' CAPITAL
Paid-in capital, unlimited number of shares authorized, 9,047,040 shares issued and outstanding at December 31, 2014 and 9,206,940 shares issued and outstanding at December 31, 2013	217,646,428	219,648,412
Accumulated undistributed earnings (deficit)	-94,448,424	-52,501,728
Total shareholders' capital (Net assets)	123,198,004	167,146,684
Total liabilities and shareholders' capital	135,567,711	170,897,991
Net assets	$123,198,004	$167,146,684
Shares outstanding	9,047,040	9,206,940
Net asset value per share outstanding (net assets divided by shares outstanding)	$13.62	$18.15
Market value per share outstanding	$12.83	$15.17

STATEMENTS_OF_FINANCIAL_CONDIT1

STATEMENTS OF FINANCIAL CONDITION (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Short-term investments, at cost	$113,736,191	$141,217,188
Call options written, at value, premiums received	$952,693	$777,236
Common stock, shares issued	9,047,040	9,206,940
Common stock, shares outstanding	9,047,040	9,206,940

STATEMENTS_OF_OPERATIONS

STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Investment Income:
Interest	$139,301	$199,940	$248,744
Total Investment Income	139,301	199,940	248,744
Expenses:
Management fees	1,996,737	2,256,873	2,606,260
Brokerage commissions	115,325	123,679	143,578
Custodian fees and expenses	102,590	112,260	114,805
Offering costs			332,930
Independent Committee fees and expenses	56,178	52,968	108,456
Professional fees	468,873	517,714	560,382
Shareholder reporting expenses	118,675	159,435	147,222
Other expenses	27,584	32,579	27,713
Total expenses before expense reimbursement	2,885,962	3,255,508	4,041,346
Expense reimbursement			-166,465
Net expenses	2,885,962	3,255,508	3,874,881
Net investment income (loss)	-2,746,661	-3,055,568	-3,626,137
Net realized gain (loss) from:
Short-term investments	547	3,618	-425
Futures contracts	-16,873,345	-21,217,789	-5,031,471
Call options written	3,826,262	4,711,122	7,166,083
Change in net unrealized appreciation (depreciation) of:
Short-term investments	-20,004	-9,983	-1,266
Futures contracts	-12,716,647	5,662,047	1,138,797
Call options written	908,317	-690,565	-438,556
Net realized gain (loss) and change in net unrealized appreciation (depreciation)	-24,874,870	-11,541,550	2,833,162
Net income (loss)	($27,621,531)	($14,597,118)	($792,975)
Net income (loss) per weighted-average share	($3.01)	($1.58)	($0.09)
Weighted-average shares outstanding	9,188,249	9,219,170	9,219,413

STATEMENTS_OF_CHANGES_IN_SHARE

STATEMENTS OF CHANGES IN SHAREHOLDERS' CAPITAL (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shareholders' capital-beginning of period		$167,146,684		$197,141,908	$167,146,684	$197,141,908	$214,180,129
Repurchase of shares					-2,001,984	-186,659	-203,766
Net increase (decrease) in shareholders' capital resulting from operations:
Net investment income (loss)	-603,136	-713,847	-756,721	-749,613	-2,746,661	-3,055,568	-3,626,137
Net realized gain (loss) from:
Short-term investments					547	3,618	-425
Futures contracts					-16,873,345	-21,217,789	-5,031,471
Call options written					3,826,262	4,711,122	7,166,083
Change in net unrealized appreciation (depreciation) of:
Short-term investments					-20,004	-9,983	-1,266
Futures contracts					-12,716,647	5,662,047	1,138,797
Call options written					908,317	-690,565	-438,556
Net income (loss)	-19,134,437	7,278,941	-2,359,312	-3,180,105	-27,621,531	-14,597,118	-792,975
Distributions to shareholders					-14,325,165	-15,211,447	-16,041,480
Shareholders' capital-end of period	$123,198,004		$167,146,684		$123,198,004	$167,146,684	$197,141,908
Shares-beginning of period		9,206,940		9,219,240	9,206,940	9,219,240	9,229,040
Repurchase of shares					-159,900	-12,300	-9,800
Shares-end of period	9,047,040		9,206,940		9,047,040	9,206,940	9,219,240

STATEMENTS_OF_CASH_FLOWS

STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	($27,621,531)	($14,597,118)	($792,975)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Purchases of U.S. Government and agency obligations	-136,568,938	-146,062,076	-288,232,021
Proceeds from sales and maturities of U.S. government and agency obligations	163,699,924	176,495,271	292,051,302
Proceeds from (Purchase of) repurchase agreements, net	489,859	-991,830	617,967
Premiums received for call options written	5,003,593	5,116,574	8,160,238
Cash paid for call options written	-1,001,874	-602,263	-1,448,155
Amortization (Accretion) of short-term investments	-139,301	-199,825	701,725
(Increase) Decrease in:
Deposits with brokers	4,556,754	5,736,696	12,703,318
Interest receivable			561,049
Other assets			200,745
Increase (Decrease) in:
Accrued management fees	-40,227	-32,162	-18,646
Accrued Independent Committee fees	168	-7,188	-11,127
Other accrued expenses	98,735	66,728	-67,696
Net realized (gain) loss from:
Short-term investments	-547	-3,618	425
Call options written	-3,826,262	-4,711,122	-7,166,083
Change in net unrealized (appreciation) depreciation of:
Short-term investments	20,004	9,983	1,266
Futures contracts	12,716,647	-5,662,047	-1,138,797
Call options written	-908,317	690,565	438,556
Net cash provided by (used in) operating activities	16,478,687	15,246,568	16,561,091
Cash flows from financing activities:
Cash paid for shares repurchased	-2,153,522	-35,121	-519,611
Cash distributions paid to shareholders	-14,325,165	-15,211,447	-16,041,480
Net cash provided by (used in) financing activities	-16,478,687	-15,246,568	-16,561,091
Net increase (decrease) in cash	0	0	0
Cash-beginning of period	0	0	0
Cash-end of period	$0	$0	$0

SCHEDULE_OF_INVESTMENTS1

SCHEDULE OF INVESTMENTS	12 Months Ended
	Dec. 31, 2014
SCHEDULE OF INVESTMENTS	SCHEDULE OF INVESTMENTS
	December 31, 2014
	Investments
	Principal			Description		Coupon				Maturity				Ratings(1)				Value
	Amount (000)
				Short-Term Investments
				U.S. Government and Agency Obligations
		$    4,000		U.S. Treasury Bills			0	%			1/8/15				Aaa			$	3,999,992
		6,000		U.S. Treasury Bills			0	%			2/5/15				Aaa				5,999,856
		10,000		U.S. Treasury Bills			0	%			3/5/15				Aaa				9,999,700
		15,000		U.S. Treasury Bills			0	%			4/2/15				Aaa				14,998,500
		18,000		U.S. Treasury Bills			0	%			4/30/15				Aaa				17,997,354
		18,700		U.S. Treasury Bills			0	%			5/28/15				Aaa				18,695,063
		5,500		U.S. Treasury Bills			0	%			6/25/15				Aaa				5,497,674
		18,000		U.S. Treasury Bills			0	%			7/23/15				Aaa				17,988,642
		8,000		U.S. Treasury Bills			0	%			9/17/15				Aaa				7,990,256
		2,000		U.S. Treasury Bills			0	%			10/15/15				Aaa				1,997,180
		6,000		U.S. Treasury Bills			0	%			11/12/15				Aaa				5,990,844
		1,500		U.S. Treasury Bills			0	%			12/10/15				Aaa				1,496,901
		$112,700		Total U.S. Government And Agency Obligations														$	112,651,962
				(cost $112,650,770)
				Repurchase Agreements
		$    1,085		Repurchase Agreement with State Street Bank, dated 12/31/14, repurchase price $1,085,421, collateralized by $795,000 U.S. Treasury Bonds, 8.000%, due 11/15/21, value $1,113,007			0	%			1/2/15				N/A			$	1,085,421
				Total Repurchase Agreements (cost $1,085,421)															1,085,421
				Total Short-Term Investments (cost $113,736,191)														$	113,737,383
	Investments in Derivatives
	Futures Contracts outstanding:
	Commodity		Contract	Contract				Contract				Number of				Notional				Unrealized
	Group			Position(2)				Expiration				Contracts(3)				Amount				Appreciation
																at  Value(3)				(Depreciation)(4)
	Energy		Crude Oil
			ICE Brent Crude Oil Futures Contract		Long				February 2015				102			$	5,847,660			$	(718,110	)
			ICE Brent Crude Oil Futures Contract		Long				Mar-15				100				5,821,000				(1,682,272	)
			NYMEX Crude Oil Futures Contract		Long				Feb-15				68				3,622,360				(377,800	)
			NYMEX Crude Oil Futures Contract		Long				Mar-15				66				3,544,200				(755,150	)
			Total Crude Oil																		(3,533,332	)
			Heating Oil
			ICE Gas Oil Futures Contract		Long				Feb-15				20				1,042,500				(110,500	)
			NYMEX NY Harbor ULSD Futures Contract		Long				Feb-15				32				2,464,358				(703,568	)
			NYMEX NY Harbor ULSD Futures Contract		Long				Mar-15				17				1,297,481				(300,833	)
			Total Heating Oil																		(1,114,901	)
			Natural Gas
			NYMEX Natural Gas Futures Contract		Long				February 2015				158				4,564,620				(1,895,660	)
			NYMEX Natural Gas Futures Contract		Long				Mar-15				87				2,519,520				(905,560	)
			Total Natural Gas																		(2,801,220	)
	Commodity		Contract	Contract				Contract				Number of				Notional				Unrealized
	Group			Position(2)				Expiration				Contracts(3)				Amount				Appreciation
																at  Value(3)				(Depreciation)(4)
	Energy		Unleaded Gas
	(continued)		NYMEX Gasoline RBOB Futures Contract		Long				February 2015				24			$	1,483,877			$	(556,279	)
			NYMEX Gasoline RBOB Futures Contract		Long				Mar-15				21				1,326,616				(457,317	)
			Total Unleaded Gas																		(1,013,596	)
			Total Energy																		(8,463,049	)
	Industrial Metals		Aluminum
			LME Primary Aluminum Futures Contract		Long				Jan-15				143				6,555,656				(373,981	)
			LME Primary Aluminum Futures Contract		Short				Jan-15				(7	)			(320,906	)			11,750
			Total Aluminum																		(362,231	)
			Copper
			COMEX Copper Futures Contract		Long				Mar-15				32				2,260,400				(165,888	)
			COMEX Copper Futures Contract		Long				May-15				9				635,287				(6,638	)
			LME Copper Futures Contract		Long				Jan-15				61				9,682,225				(262,900	)
			LME Copper Futures Contract		Long				Mar-15				21				3,311,700				(179,550	)
			LME Copper Futures Contract		Short				Jan-15				(23	)			(3,650,675	)			178,975
			LME Copper Futures Contract		Short				Mar-15				(1	)			(157,700	)			500
		Total Copper																		(435,501	)
		Nickel
		LME Nickel Futures Contract		Long				Jan-15				22				1,991,616				(163,284	)
		LME Nickel Futures Contract		Short				Jan-15				(1	)			(90,528	)			72
		Total Nickel																		(163,212	)
		Zinc
		LME Zinc Futures Contract		Long				Jan-15				37				2,005,400				(21,506	)
		LME Zinc Futures Contract		Short				Jan-15				(2	)			(108,400	)			400
		Total Zinc																		(21,106	)
		Lead
		LME Lead Futures Contract		Long				January 2015				25				1,156,875				(103,438	)
		Total Industrial Metals																		(1,085,488	)
Agriculturals		Corn
		CBOT Corn Futures Contract		Long				Mar-15				295				5,855,750				169,587
		Soybean
		CBOT Soybean Futures Contract		Long				Mar-15				165				8,443,875				(5,703	)
		Wheat
		CBOT Wheat Futures Contract		Long				Mar-15				44				1,297,450				136,888
		KCBT Wheat Futures Contract		Long				Mar-15				127				3,978,275				114,287
		Total Wheat																		251,175
		Soybean Meal
		CBOT Soybean Meal Futures Contract		Long				Mar-15				102				3,545,520				(59,239	)
		CBOT Soybean Meal Futures Contract		Long				May-15				12				409,080				(14,280	)
		Total Soybean Meal																		(73,519	)
		Soybean Oil
		CBOT Soybean Oil Futures Contract		Long				Mar-15				78				1,504,152				(37,326	)
		CBOT Soybean Oil Futures Contract		Long				May-15				11				213,510				(2,838	)
		Total Soybean Oil																		(40,164	)
		Total Agriculturals																		301,376
Commodity		Contract	Contract				Contract				Number				Notional				Unrealized
Group			Position(2)				Expiration				of				Amount				Appreciation
											Contracts(3)				at  Value(3)				(Depreciation)(4)
Precious Metals		Gold
		CEC Gold Futures Contract		Long				February 2015				120			$	14,209,200			$	(177,600	)
		Silver
		CEC Silver Futures Contract		Long				Mar-15				44				3,431,780				(144,100	)
		Platinum
		NYMEX Platinum Futures Contract		Long				Apr-15				17				1,028,075				(10,945	)
		Palladium
		NYMEX Palladium Futures Contract		Long				Mar-15				7				558,880				20,860
		Total Precious Metals																		(311,785	)
Foods and Fibers		Cotton
		ICE Cotton Futures Contract		Long				March 2015				51				1,536,885				(69,945	)
		Sugar
		ICE Sugar Futures Contract		Long				Mar-15				124				2,016,538				(261,700	)
		ICE Sugar Futures Contract		Long				May-15				12				200,525				(31,718	)
		Total Sugar																		(293,418	)
		Coffee
		ICE Coffee C Futures Contract		Long				Mar-15				20				1,249,500				(163,125	)
		LIFFE Coffee Robusta Futures Contract		Long				Mar-15				58				1,111,280				(20,370	)
		Total Coffee																		(183,495	)
		Cocoa
		ICE Cocoa Futures Contract		Long				Mar-15				20				582,000				(15,080	)
		ICE Cocoa Futures Contract		Long				May-15				7				202,440				(4,160	)
		Total Cocoa																		(19,240	)
		Total Foods and Fibers																		(566,098	)
Livestock		Live Cattle
		CME Live Cattle Futures Contract		Long				February 2015				128				8,373,760				(265,818	)
		CME Live Cattle Futures Contract		Long				Apr-15				16				1,039,360				(39,760	)
		Total Live Cattle																		(305,578	)
		Lean Hogs
		CME Lean Hog Futures Contract		Long				Feb-15				84				2,728,320				(258,961	)
		CME Lean Hog Futures Contract		Long				Apr-15				10				333,100				(12,300	)
		Total Lean Hogs																		(271,261	)
		Feeder Cattle
		CME Feeder Cattle Futures Contract		Long				Mar-15				22				2,390,575				(135,750	)
		Total Livestock																		(712,589	)
		Total Futures Contracts outstanding										2,585			$	123,044,972			$	(10,837,633	)
Commodity		Contract	Contract				Number				Strike				Value
Group			Expiration				of				Price
							Contracts
Energy		Crude Oil
		ICE Brent Crude Oil Futures Options		Feb-15				(91	)		$	70.5			$	(2,730	)
		ICE Brent Crude Oil Futures Options		February 2015				(10	)			74				(200	)
		NYMEX Crude Oil Futures Options		Jan-15				(61	)			63.5				(4,270	)
		NYMEX Crude Oil Futures Options		Jan-15				(6	)			74				(60	)
		Total Crude Oil														(7,260	)
		Heating Oil
		NYMEX NY Harbor ULSD Futures Options		Jan-15				(32	)			2.65				(134	)
		Natural Gas
		NYMEX Natural Gas Futures Options		Jan-15				(123	)			4,850.00				(2,460	)
		Unleaded Gas
		NYMEX Gasoline RBOB Futures Options		Jan-15				(23	)			22,800.00				(97	)
		Total Energy														(9,951	)
Industrial Metals		Aluminum
		LME Primary Aluminum Futures Options(5)		Jan-15				(68	)			2,075.00				—
		Copper
		LME Copper Futures Options(5)		Jan-15				(38	)			6,800.00				(19	)
		Nickel
		LME Nickel Futures Options(5)		Jan-15				(11	)			17,500.00				(2	)
		Zinc
		LME Zinc Futures Options(5)		Jan-15				(17	)			2,300.00				(111	)
		Lead
		LME Lead Futures Options(5)		Jan-15				(13	)			2,100.00				—
		Total Industrial Metals														(132	)
Agriculturals		Corn
		CBOT Corn Futures Options		Feb-15				(147	)			410				(76,256	)
		Soybean
		CBOT Soybean Futures Options		Feb-15				(82	)			1,080.00				(60,475	)
		Wheat
		CBOT Wheat Futures Options		Feb-15				(25	)			620				(32,188	)
		CBOT Wheat Futures Options		Feb-15				(22	)			580				(30,525	)
		CBOT Wheat Futures Options		Feb-15				(21	)			640				(17,981	)
		CBOT Wheat Futures Options		Feb-15				(17	)			710				(3,187	)
		Total Wheat														(83,881	)
		Soybean Meal
		CBOT Soybean Meal Futures Options		Feb-15				(57	)			400				(15,105	)
		Soybean Oil
		CBOT Soybean Oil Futures Options		Feb-15				(45	)			355				(4,050	)
		Total Agriculturals														(239,767	)
Commodity		Contract	Contract				Number				Strike				Value
Group			Expiration				of				Price
							Contracts
Precious Metals		Gold
		CEC Gold Futures Options		Jan-15				(60	)		$	1,280.00			$	(9,600	)
		Silver
		CEC Silver Futures Options		February 2015				(22	)			1,800.00				(14,520	)
		Total Precious Metals														(24,120	)
Foods and Fibers		Cotton
		ICE Cotton Futures Options		Feb-15				(26	)			68				(1,430	)
		Sugar
		ICE Sugar Futures Options		Feb-15				(68	)			17.75				(1,523	)
		Coffee
		ICE Coffee C Futures Options		Feb-15				(19	)			210				(5,914	)
		Cocoa
		ICE Cocoa Futures Options		Feb-15				(14	)			3,250.00				(980	)
		Total Foods and Fibers														(9,847	)
Livestock		Live Cattle
		CME Live Cattle Futures Options		Feb-15				(92	)			177				(10,120	)
		Lean Hogs
		CME Lean Hogs Futures Options		Feb-15				(16	)			95				(800	)
		CME Lean Hogs Futures Options		Feb-15				(31	)			93				(2,170	)
		Total Lean Hogs														(2,970	)
		Total Livestock														(13,090	)
		Total Call Options Written outstanding
		(premiums received $952,693)						(1,257	)						$	(296,907	)
-1		Ratings (not covered by the report of independent registered public accounting firm): Using the highest of Standard & Poor’s Group, Moody’s Investors Service, Inc. or Fitch, Inc. rating.
-2		The Fund expects to invest only in long futures contracts. Some short futures positions arise in futures contracts traded on the London Metal Exchange (“LME”) solely as the result of closing existing long LME futures positions. For every short LME futures contract outstanding, the Fund had previously entered into a long LME futures contract. The London Clearing House is the counterparty for both the long and short position.
-3		Total number of contracts and notional amount at value include the net effect of LME short futures positions, when applicable.
-4		The gross unrealized appreciation (depreciation) on futures contracts is $633,319 and $(11,470,952), respectively.
-5		For fair value measurement disclosure purposes, these Call Options Written are classified as Level 2. See Notes to Financial Statements, Note 2 – Summary of Significant Accounting Policies, Investment Valuation and Fair Value Measurements for more information.
N/A		Not applicable.
CBOT		Chicago Board of Trade
CEC		Commodities Exchange Center
CME		Chicago Mercantile Exchange
COMEX		Commodities Exchange, Inc.
ICE		Intercontinental Exchange
KCBT		Kansas City Board of Trade
LIFFE		London International Financial Futures Exchange
LME		London Metal Exchange
NY Harbor ULSD		New York Harbor Ultra-Low Sulfur Diesel
NYMEX		New York Mercantile Exchange
RBOB		Reformulated Gasoline Blendstock for Oxygen Blending

Organization

Organization	12 Months Ended
	Dec. 31, 2014
Organization	1. Organization
	Fund Information
	The Nuveen Diversified Commodity Fund (the “Fund”) was organized as a Delaware statutory trust on December 7, 2005, to operate as a commodity pool. Nuveen Commodities Asset Management, LLC, the Fund’s manager (“NCAM” or the “Manager”), a wholly-owned subsidiary of Nuveen Investments, Inc. (“Nuveen Investments”), is a Delaware limited liability company registered as a commodity pool operator with the Commodity Futures Trading Commission (the “CFTC”) and is a member of the National Futures Association (the “NFA”). The Fund commenced operations on September 27, 2010, with its initial public offering. The Fund operates pursuant to a Second Amended and Restated Trust Agreement dated as of March 30, 2012 (the “Trust Agreement”). The Fund’s shares represent units of fractional undivided beneficial interest in, and ownership of, the Fund. The Fund’s shares trade on the NYSE MKT under the ticker symbol “CFD.” The Fund is not a mutual fund, a closed-end fund, or any other type of “investment company” within the meaning of the Investment Company Act of 1940, as amended, and is not subject to regulation thereunder.
	Investment Adviser
	The Manager has selected its affiliate, Gresham Investment Management LLC (“Gresham LLC”), acting through its Near Term Active division (in that capacity, “Gresham” or the “Commodity Sub-adviser”), to manage the Fund’s commodity investment strategy and its options strategy. Gresham LLC is a Delaware limited liability company, the successor to Gresham Investment Management, Inc., formed in July 1992. Gresham LLC is registered with the CFTC as a commodity trading adviser and commodity pool operator, is a member of the NFA and is registered with the Securities and Exchange Commission (the “SEC”) as an investment adviser.
	The Manager has selected its affiliate, Nuveen Asset Management, LLC (“Nuveen Asset Management” or the “Collateral Sub-adviser”), to manage the Fund’s collateral invested in cash equivalents, U.S. government securities and other short-term, high grade debt securities. Nuveen Asset Management is a Delaware limited liability company and is registered with the SEC as an investment adviser.
	Sale of Nuveen Investments
	On October 1, 2014, TIAA-CREF, a national financial services organization, completed its previously announced acquisition of Nuveen Investments, the parent company of the Manager, the Commodity Sub-adviser and the Collateral Sub-adviser. The transaction has not resulted in any change in the portfolio management of the Fund or in the Fund’s investment objectives or policies.
	Proposed Conversion to ETF Structure
	On December 19, 2014, the Fund issued a press release announcing that the Manager had approved a plan to convert the Fund (the “Conversion”) into an open-end exchange-traded fund (“ETF”). The Conversion will only become effective upon satisfaction of several conditions, including the receipt of shareholder and regulatory approvals. The Fund is not currently, and after the Conversion will not be, a mutual fund or any other type of investment company within the meaning of 1940 Act. Until the Conversion occurs, the Fund will continue to operate as currently structured.
	Investment Objectives and Principal Investment Strategies
	The Fund’s investment objective is to generate higher risk-adjusted total return than leading commodity market benchmarks. Risk-adjusted total return refers to the income and capital appreciation generated by a portfolio (the combination of which equals its total return) per unit of risk taken, with such risk measured by the volatility of the portfolio’s total returns over a specific period of time. In pursuing its investment objective, the Fund invests directly in a diversified portfolio of commodity futures, forward and options contracts to obtain broad exposure to all principal groups in the global commodity markets. The Fund’s investment strategy has three principal elements:
		•	An actively managed portfolio of commodity futures and forward contracts utilizing Gresham’s proprietary Tangible Asset Program®, or TAP®, a long-only rules-based commodity investment strategy designed to maintain consistent, fully collateralized exposure to commodities as an asset class;
		•	An integrated program of writing commodity call options designed to enhance the risk-adjusted total return of the Fund’s commodity investments (TAP® and this options strategy are collectively referred to as TAP PLUSSM); and
		•	A collateral portfolio of cash equivalents, U.S. government securities and other short-term, high grade debt securities.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies
	The Fund follows accounting and reporting guidance under Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 946 “Financial Services-Investment Companies.” The following is a summary of significant accounting policies followed by the Fund in the preparation of its financial statements in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”). The presentation of “Purchases of U.S. government and agency obligations”, “Proceeds from sales and maturities of U.S. Government and agency obligations” and “Proceeds from (Purchases of) repurchase agreements, net” on the Statements of Cash Flows has been reclassified in the prior years to conform to the December 31, 2014 presentation.
	Basis of Accounting
	The accompanying financial statements have been prepared in conformity with U.S. GAAP. The preparation of financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates.
	Futures Contracts
	The Fund invests in commodity futures contracts. Upon execution of a futures contract, the Fund is obligated to deposit cash or eligible securities, also known as “initial margin,” into an account at its clearing broker. Generally investments in futures contracts also obligate the investor and the clearing broker to settle monies on a daily basis representing changes in the prior days “mark-to-market” of the open contracts. If the Fund has unrealized appreciation the clearing broker would credit the Fund’s account with an amount equal to appreciation and conversely if the Fund has unrealized depreciation the clearing broker would debit the Fund’s account with an amount equal to depreciation. These daily cash settlements are also known as “variation margin.” In lieu of posting variation margin daily, the Fund has deposited cash with the clearing broker, generally representing approximately twice the required initial margin to cover the initial margin and the daily changes in the market value of its futures investments. Cash held by the clearing broker to cover both margin requirements on open futures contracts is recognized as “Deposits with brokers” on the Statements of Financial Condition.
	During the period the futures contract is open, changes in the value of the contract are recognized as an unrealized gain or loss by “marking-to-market” on a daily basis to reflect the changes in market value of the contract, which are recognized as a component of “Unrealized appreciation or depreciation on futures contracts” on the Statements of Financial Condition and “Change in net unrealized appreciation (depreciation) of futures contracts” on the Statements of Operations. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract on the closing date and the value of the contract when originally entered into, which is recognized as a component of “Net realized gain (loss) from futures contracts” on the Statements of Operations.
	The Fund expects to invest only in long futures contracts. Some short futures positions may arise in futures contracts traded on the London Metal Exchange (“LME”) solely as the result of closing existing long LME futures positions. For every short LME futures contract outstanding, the Fund had previously entered into a long futures contract. The LME Clearing House is the counterparty for both the long and short positions.
	Risks of investments in commodity futures contracts include possible adverse movement in the price of the commodities underlying the contracts, the possibility that there may not be a liquid secondary market for the contracts and the possibility that a change in the value of the contract may not correlate with a change in the value of the underlying commodities.
	The average number of futures contracts outstanding during the fiscal years ended December 31, 2014 and December 31, 2013 was as follows:
			Year Ended			Year Ended
			December 31, 2014			December 31, 2013
	Average number of futures contracts outstanding*			2,764			3,076
	*	The average number of contracts is calculated based on the number of contracts outstanding at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.
	Refer to Note 3 – Derivative Instruments and Hedging Activities within these Notes to Financial Statements for further details on futures contracts activity.
	Options Contracts
	The Fund may write (sell) and purchase options on commodity futures and forward contracts to enhance the Fund’s risk-adjusted total return. When the Fund writes an option, an amount equal to the premium received is recognized as a component of “Call options written, at value” on the Statements of Financial Condition and is subsequently adjusted to reflect the current value of the written option until the option expires or the Fund enters into a closing purchase transaction. The changes in value of the options written during the reporting period are recognized as a component of “Change in net unrealized appreciation (depreciation) of call options written” on the Statements of Operations. When an option is exercised or expires, or the Fund enters into a closing purchase transaction, the difference between the net premium received and any amount paid at expiration or on executing a closing purchase transaction is recognized as a component of “Net realized gain (loss) from call options written” on the Statements of Operations. The Fund, as writer of an option, has no control over whether the underlying instrument may be sold (called) and as a result bears the risk of an unfavorable change in the market value of the instrument underlying the written option. There is also the risk the Fund may not be able to enter into a closing transaction because of an illiquid market. During the fiscal years ended December 31, 2014 and December 31, 2013, the Fund wrote call options on futures contracts.
	The Fund did not purchase options on futures or forward contracts during the fiscal years ended December 31, 2014 and December 31, 2013. The purchase of options involves the risk of loss of all or part of the cash paid for the options (the premium). The market risk associated with purchasing options is limited to the premium paid. The counterparty credit risk of purchasing options, however, needs to take into account the current value of the option, as this is the performance expected from the counterparty.
	Transactions in call options written during the fiscal years ended December 31, 2014 and December 31, 2013 were as follows:
			Year Ended						Year Ended
			December 31,  2014						December 31, 2013
			Number of			Premiums			Number of			Premiums
			Contracts			Received			Contracts			Received
	Outstanding, beginning of period			1,377		$	777,236			1,537		$	974,047
	Options written			9,114			5,003,593			10,128			5,116,574
	Options terminated in closing purchase transactions			(4,006	)		(1,970,074	)		(5,455	)		(2,788,807	)
	Options expired			(3,848	)		(2,173,528	)		(3,897	)		(2,058,351	)
	Options exercised			(1,380	)		(684,534	)		(936	)		(466,227	)
	Outstanding, end of the period			1,257		$	952,693			1,377		$	777,236
	The average number of call options written outstanding during the fiscal years ended December 31, 2014 and December 31, 2013 was as follows:
			Year Ended			Year Ended
			December 31, 2014			December 31, 2013
	Average number of call options written outstanding*			1,338			1,452
	*	The average number of contracts is calculated based on the outstanding number of contracts at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.
	Refer to Note 3 – Derivative Instruments and Hedging Activities within these Notes to Financial Statements for further details on options activity.
	Forward Contracts
	The Fund may enter into forward contracts but did not make any such investments during the fiscal years ended December 31, 2014 and December 31, 2013. A forward contract is an agreement between two parties to purchase or sell a specified quantity of a commodity at or before a specified date in the future at a specified price. Forward contracts are typically traded in the over-the-counter (“OTC”) markets and all details of the contract are negotiated between the counterparties to the agreement. Accordingly, the forward contracts are valued by reference to the contracts traded in the OTC markets.
	The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity, establishing an opposite position in the contract and recognizing the profit or loss on both positions simultaneously on the delivery date or, in some instances, paying a cash settlement before the designated date of delivery. The forward contracts are adjusted by the daily fluctuation of the underlying commodity or currency and any gains or losses are recognized on the Statements of Operations as unrealized appreciation or depreciation until the contract settlement date.
	Forward contracts are, in general, not cleared or guaranteed by a third party. The Fund may collateralize forward commodity contracts with cash and/or certain securities as indicated on its Statements of Financial Condition or Schedule of Investments, when applicable, and such collateral is held for the benefit of the counterparty in a segregated account at the custodian to protect the counterparty against non-payment by the Fund. In the event of a default by the counterparty, the Fund will seek return of this collateral and may incur certain costs exercising its right with respect to the collateral.
	The Fund remains subject to credit risk with respect to the amount it expects to receive from counterparties, as those amounts are not similarly collateralized by the counterparty. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the Fund may experience significant delays in obtaining any recovery in a bankruptcy or other reorganization proceeding. The Fund may obtain only limited recovery or may obtain no recovery in such circumstances.
	Participants in trading foreign exchange forward contracts often do not require margin deposits, but rely upon internal credit limitations and their judgments regarding the creditworthiness of their counterparties.
	The Fund will enter into forward contracts only with large, well-capitalized and well-established financial institutions. The creditworthiness of each of the firms which is a party to a forward contract is monitored by the Manager.
	Netting Agreements
	In the ordinary course of business, the Fund has entered into transactions subject to enforceable master repurchase agreements or other similar arrangements (“netting agreements”). Generally, the right to offset in netting agreements allows the Fund to offset any exposure to a specific counterparty with any collateral received or delivered to that counterparty based on the terms of the agreements. The Fund manages its cash collateral and securities collateral on a counterparty basis. As of December 31, 2014 and December 31, 2013, the Fund was not invested in any portfolio securities or derivatives, other than the repurchase agreements further described below, that are subject to netting agreements.
	Repurchase Agreements
	In connection with transactions in repurchase agreements, it is the Fund’s policy that its custodian take possession of the underlying collateral securities, the fair value of which exceeds the principal amount of the repurchase transaction, including accrued interest, at all times. If the counterparty defaults, and the fair value of the collateral declines, realization of the collateral may be delayed or limited.
	The following tables present the repurchase agreements for the Fund, presented on the Statements of Financial Condition as of December 31, 2014 and December 31, 2013, and recognized as a component of “Short-term investments, at value,” that are subject to netting agreements as of the end of each reporting period, and the collateral delivered related to those repurchase agreements.
			December 31, 2014
			Counterparty			Short-Term			Collateral Pledged			Net
						Investments,			(From)			Exposure
						at Value			Counterparty*
	Repurchase Agreements			State Street Bank		$	1,085,421		$	(1,085,421	)	$	—
			31-Dec-13
			Counterparty			Short-Term			Collateral Pledged			Net
						Investments,			(From)			Exposure
						at Value			Counterparty*
	Repurchase Agreements			State Street Bank		$	1,575,280		$	(1,575,280	)	$	—
	*	As of December 31, 2014 and December 31, 2013, the value of the collateral pledged from the counterparty exceeded the value of the repurchase agreements. The value of the collateral pledged from the counterparty as of December 31, 2014 and December 31, 2013 was $1,113,007 and $1,608,072, respectively.
	Collateral Investments
	Currently, approximately 15% of the Fund’s net assets are committed to secure the Fund’s futures contract positions. These assets are placed in a commodity futures account maintained by the Fund’s clearing broker, and are held in high-quality instruments permitted under CFTC regulations.
	The Fund’s remaining assets are held in a separate collateral investment account managed by the Collateral Sub-adviser. The Fund’s assets held in the separate collateral account are invested in cash equivalents, U.S. government securities and other high-quality short-term debt securities with final terms not exceeding one year at the time of investment. The collateral portfolio’s debt securities (other than U.S. government securities) are rated at the highest applicable rating as determined by at least one nationally recognized statistical rating organization, or if unrated, judged by the Collateral Sub-adviser to be of comparable quality.
	Investment Valuation
	Commodity futures contracts and options on commodity futures contracts traded on an exchange will be valued at the final settlement price or official closing price as determined by the principal exchange on which the instruments are traded as supplied by independent pricing services. These investments are generally classified as Level 1 for fair value measurement purposes. OTC commodity futures and forward contracts and options on commodity futures and forward contracts not traded on an exchange will be valued, in order of hierarchy, by independent pricing services, price quotations obtained from counterparty broker-dealers, or through fair valuation methodologies as determined by the Manager. These investments are generally classified as Level 2. Additionally, events may occur after the close of the market, but prior to the determination of the Fund’s net asset value, that may affect the values of the Fund’s investments. In such circumstances, the Manager will determine a fair valuation for such investments that in its opinion is reflective of fair market value. These investments are generally classified as Level 2 or Level 3 depending on the priority of the significant inputs.
	Prices of fixed-income securities, including, but not limited to, highly-rated agency discount notes and U.S. Treasury bills, are provided by a pricing service approved by the Fund’s Manager. These securities are generally classified as Level 2. The pricing service establishes a security’s fair value using methods that may include consideration of the following: yields or prices of investments of comparable quality, type of issue, coupon, maturity and rating, market quotes or indications of value from security dealers, general market conditions and other information and analysis, including the obligor’s credit characteristics considered relevant. These securities are generally classified as Level 2 or Level 3 depending on the priority of the significant inputs.
Repurchase agreements are valued at contract amount plus accrued interest, which approximates market value. These securities are generally classified as Level 2.
Fair Value Measurements
Fair value is defined as the price that the Fund would receive upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market for the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The following is a summary of the three-tier hierarchy of valuation inputs.
Level 1—Inputs are unadjusted and prices are determined by quoted prices in active markets for identical securities.
Level 2—Prices are determined using other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).
Level 3—Prices are determined using significant unobservable inputs (including management’s assumptions in determining the fair value of investments).
The inputs or methodologies used for valuing securities are not an indication of the risks associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of December 31, 2014 and December 31, 2013:
		December 31, 2014
		Level 1			Level 2			Level 3			Total
Short-Term Investments:
U.S. Government and Agency Obligations		$	—		$	112,651,962		$	—		$	112,651,962
Repurchase Agreements			—			1,085,421			—			1,085,421
Investments in Derivatives:
Futures Contracts*			(10,837,633	)		—			—			(10,837,633	)
Call Options Written**			(296,775	)		(132	)		—			(296,907	)
Total		$	(11,134,408	)	$	113,737,251		$	—		$	102,602,843
		31-Dec-13
		Level 1			Level 2			Level 3			Total
Short-Term Investments:
U.S. Government and Agency Obligations		$	—		$	139,663,104		$	—		$	139,663,104
Repurchase Agreements			—			1,575,280			—			1,575,280
Investments in Derivatives:
Futures Contracts*			1,879,014			—			—			1,879,014
Call Options Written			(779,835	)		(249,932	)		—			(1,029,767	)
Total		$	1,099,179		$	140,988,452		$	—		$	142,087,631
*	Represents the net unrealized appreciation (depreciation) of futures contracts as reported on the Statements of Financial Condition.
**	Refer to the Schedule of Investments for a breakdown of call options written classified as Level 2, which is comprised of the Fund’s call options written on the LME.
The Manager is responsible for the Fund’s valuation process and has delegated daily oversight of the process to the Manager’s Valuation Committee. The Valuation Committee, pursuant to its valuation policies and procedures, is responsible for making fair value determinations, evaluating the effectiveness of the Fund’s pricing policies, and reporting to the Manager’s senior management. The Valuation Committee is aided in its efforts by the Manager’s Securities Valuation Team, which is responsible for administering the daily valuation process and applying fair value methodologies as approved by the Valuation Committee. When determining the reliability of independent pricing services for investments owned by the Fund, the Valuation Committee, among other things, conducts due diligence reviews of the pricing services and monitors the quality of security prices received through various testing reports conducted by the Securities Valuation Team.
For each portfolio instrument that has been fair valued pursuant to the Valuation Committee’s policies, the fair value price is compared against the last available and next available market quotations. The Valuation Committee reviews the results of such testing and fair valuation occurrences are reported to the Manager’s senior management.
Investment Transactions
Investment transactions are recorded on a trade date basis. Realized gains and losses from investment transactions are determined on the specific identification method, which is the same for federal income tax purposes.
Investment Income
Interest income, which reflects the amortization of premiums and includes accretion of discounts for financial reporting purposes, is recorded on an accrual basis.
Brokerage Commissions and Fees
The Fund pays brokerage commissions, including applicable clearing costs, exchange fees, NFA fees, give-up fees, pit brokerage fees and other transaction-related fees and expenses, incurred in connection with its commodity trading activities.
Income Taxes
No provision for federal, state, and local income taxes has been made in the accompanying financial statements because the Fund has elected to be classified as a partnership for U.S. federal income tax purposes. Each owner of the Fund’s shares will be required to take into account its allocable share of the Fund’s income, gains, losses, deductions and other items for the Fund’s taxable year.
For all open tax years and all major taxing jurisdictions, the Manager of the Fund has concluded that there are no significant uncertain tax positions that would require recognition in the financial statements. Open tax years are those that are open for examination by taxing authorities (i.e., generally the last four tax year ends and the interim tax period since then). Furthermore, the Manager of the Fund is also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months.
Expense Recognition
All expenses of the Fund are recognized on an accrual basis. The Fund pays all routine and extraordinary costs and expenses of its operations, brokerage expenses, custody fees, transfer agent expenses, professional fees, expenses of preparing, printing and distributing reports, notices, information statements, proxy statements, reports to governmental agencies, and taxes, if any.
Offering Costs
During April 2011, the Fund filed a Registration Statement on Form S-1 with the SEC to register additional shares of the Fund for future issuance. Costs incurred by the Fund in 2011 and 2012 in connection with the planned offering were recorded as a deferred charge and recognized as a component of “Other assets” on the Statements of Financial Condition during the fiscal year ended December 31, 2011. Due to adverse market conditions the offering did not take place and the Fund withdrew the Form S-1 filing during October 2012. As a result, the costs incurred by the Fund were expensed in 2012 since they would not benefit the Fund in a future offering and the Manager reimbursed the Fund for half of such costs. These costs are recognized as “Offering costs” on the Statements of Operations.
Calculation of Net Asset Value
The net asset value per share of the Fund on any given day is computed by dividing the value of all assets of the Fund (including any accrued interest), less all liabilities (including accrued expenses and distributions declared but unpaid), by the total number of shares outstanding.
Distributions
The Fund intends to make regular monthly distributions to its shareholders stated in terms of a fixed cents per share distribution rate. Among other factors, the Manager seeks to establish a distribution rate that roughly corresponds to its projections of the total return that could reasonably be expected to be generated by the Fund over an extended period of time. In the event that the amount of income earned or capital gains realized by the Fund is not sufficient to cover the Fund’s distributions, the Fund may be required to liquidate investments to fund distributions at times or on terms that are disadvantageous to the Fund and its shareholders. As market conditions and portfolio performance may change, the rate of distribution on the shares and the Fund’s distribution policy could change. The Manager reserves the right to change the Fund’s distribution policy and the basis for establishing the rate of the Fund’s monthly distributions, or may temporarily suspend or reduce distributions without a change in policy, at any time and may do so without prior notice to shareholders.
Distributions to shareholders are recorded on the ex-dividend date.
Commitments and Contingencies
Under the Fund’s organizational documents, the Manager, Wilmington Trust Company (the Fund’s Delaware trustee) and the Manager’s Independent Committee members are indemnified against certain liabilities arising out of the performance of their duties to the Fund. In addition, in the normal course of business, the Fund enters into contracts that provide general indemnifications to other parties. The Fund’s maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Fund that have not yet occurred. However, the Fund has not had prior claims or losses pursuant to these contracts and believes the risk of loss to be remote.
Financial Instrument Risk
The Fund utilizes commodity futures and options, whose values are based upon an underlying asset and generally represent future commitments that have a reasonable possibility of being settled in cash or through physical delivery. As of December 31, 2014 and December 31, 2013, the financial instruments held by the Fund were traded on an exchange and are standardized contracts.
Market risk is the potential for changes in the value of the financial instruments traded by the Fund due to market changes, including fluctuations in commodity prices. Investing in commodity futures and forward contracts involves the Fund entering into contractual commitments to purchase or sell a particular commodity at a specified date and price. The market risk associated with the Fund’s commitments to purchase commodities will be limited to the gross or face amount of the contracts held. The Fund’s exposure to market risk may be influenced by a number of factors, including changes in international balances of payments and trade, currency devaluations and revaluations, changes in interest and foreign currency exchange rates, price volatility of commodity futures and forwards contracts and market liquidity, weather, geopolitical events and other factors. These factors also affect the Fund’s investments in options on commodity futures and forward contracts. The inherent uncertainty of the Fund’s investments as well as the development of drastic market occurrences could ultimately lead to a loss of all, or substantially all, of investors’ capital.
Credit risk is the possibility that a loss may occur due to failure of a counterparty performing according to the terms of the forwards, futures and option contracts. The Fund may be exposed to credit risk from its investments in commodity futures and forward contracts and options on commodity futures and forward contracts resulting from the clearing house associated with a particular exchange failing to meet its obligations to the Fund. In general, clearing houses are backed by their corporate members who may be required to share in the financial burden resulting from the nonperformance of one of their members, which should significantly reduce this credit risk. In cases where the clearing house is not backed by the clearing members (i.e., as in some foreign exchanges), it may be backed by a consortium of banks or other financial institutions. There can be no assurance that any counterparty, clearing member or clearing house will meet its obligations to the Fund.
The commodity markets have volatility risk. The commodity markets have experienced periods of extreme volatility. General market uncertainty and consequent repricing risk have led to market imbalances of sellers and buyers, which in turn have resulted in significant reductions in values of a variety of commodities. Similar future market conditions may result in rapid and substantial valuation increases or decreases in the Fund’s holdings. In addition, volatility in the commodity and securities markets may directly and adversely affect the setting of distribution rates on the Fund’s shares.

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities	3. Derivative Instruments and Hedging Activities
	The Fund records derivative instruments at fair value, with changes in fair value recognized on the Statements of Operations.
	The following tables present the fair value of all derivative instruments held by the Fund as of December 31, 2014 and December 31, 2013, the location of these instruments on the Statements of Financial Condition and the primary underlying risk exposure.
				December 31, 2014
				Location on the Statements of Financial Condition
	Underlying	Derivative		Asset Derivatives				Liability Derivatives
	Risk Exposure	Instrument		Location	Value			Location		Value
	Commodity	Futures Contracts		Unrealized appreciation on futures contracts	$	633,319		Unrealized depreciation on futures contracts		$	11,470,952
	Commodity	Options		—		—		Call options written, at value			296,907
	Total				$	633,319				$	11,767,859
				December 31, 2013
				Location on the Statements of Financial Condition
	Underlying	Derivative		Asset Derivatives				Liability Derivatives
	Risk Exposure	Instrument		Location	Value			Location		Value
	Commodity	Futures Contracts		Unrealized appreciation on futures contracts	$	3,905,844		Unrealized depreciation on futures contracts		$	2,026,830
	Commodity	Options		—		—		Call options written, at value			1,029,767
	Total				$	3,905,844				$	3,056,597
	The following table presents the amount of net realized gain (loss) and change in net unrealized appreciation (depreciation) recognized on derivative instruments during the fiscal years ended December 31, 2014, December 31, 2013 and December 31, 2012, the location of these instruments on the Statements of Operations and the primary underlying risk exposure.
	Commodity Risk Exposure	Year Ended			Year Ended			Year Ended
		December 31, 2014			December 31, 2013			December 31, 2012
	Net realized gain (loss) from:
	Futures contracts	$	(16,873,345	)	$	(21,217,789	)	$	(5,031,471	)
	Call options written		3,826,262			4,711,122			7,166,083
	Change in net unrealized appreciation (depreciation) of:
	Futures contracts	$	(12,716,647	)	$	5,662,047		$	1,138,797
	Call options written		908,317			-690,565			-438,556

Related_Parties

Related Parties	12 Months Ended
	Dec. 31, 2014
Related Parties	4. Related Parties
	The Manager, the Commodity Sub-adviser and the Collateral Sub-adviser are considered to be related parties to the Fund.
	For the services and facilities provided by the Manager, the Fund pays the Manager an annual management fee, payable monthly, based on the Fund’s average daily net assets, according to the following schedule:
	Average Daily Net Assets	Management Fee
	For the first $500 million		1.25	%
	For the next $500 million		1.225
	For the next $500 million		1.2
	For the next $500 million		1.175
	For net assets over $2 billion		1.15
	“Average daily net assets” represents the total assets of the Fund, minus the sum of its total liabilities.
	The Manager and the Fund have entered into sub-advisory agreements with the Commodity Sub-adviser and the Collateral Sub-adviser. Both the Commodity Sub-adviser and the Collateral Sub-adviser are compensated for their services to the Fund from the management fees paid to the Manager, and the Fund does not reimburse the Manager for those fees.

Share_Repurchase_Program

Share Repurchase Program	12 Months Ended
	Dec. 31, 2014
Share Repurchase Program	5. Share Repurchase Program
	On December 21, 2011, the Fund adopted an open-market share repurchase program, pursuant to which it was authorized to repurchase up to 10% of its outstanding common shares (approximately 920,000 shares) in open-market transactions at the Manager’s discretion.
	On March 6, 2014, the Fund reauthorized its share repurchase program, pursuant to which it may repurchase up to 10% of its outstanding common shares as of the reauthorization date (approximately 920,000 shares) in open-market transactions at the Manager’s discretion.
	Transactions in share repurchases during the fiscal years ended December 31, 2014, December 31, 2013 and December 31, 2012, were as follows:
		Year Ended			Year Ended			Year Ended
		December 31,  2014			December 31,  2013			December 31, 2012
	Shares repurchased		159,900			12,300			9,800
	Weighted average price per share repurchased	$	12.5		$	15.16		$	20.77
	Weighted average discount per share repurchased		18.14	%		17.1	%		12.12	%

Financial_Highlights

Financial Highlights	12 Months Ended
	Dec. 31, 2014
Financial Highlights	6. Financial Highlights
	The following financial highlights relate to investment performance and operations for a Fund share outstanding during the fiscal years ended December 31, 2014, December 31, 2013 and December 31, 2012. The Net Asset Value presentation is calculated using average daily shares outstanding. The Ratios to Average Net Assets are calculated using average daily net assets. The Total Returns at Net Asset Value and Market Value are based on the change in net asset value and market value, respectively, for a share during the period. An investor’s return and ratios will vary based on the timing of purchasing and selling Fund shares.
			Year Ended December 31,
			2014			2013			2012
	Net Asset Value:
	Net asset value per share—beginning of period		$	18.15		$	21.38		$	23.21
	Net investment income (loss)			(0.30	)		(0.33	)		(0.39	)
	Net realized and unrealized gain (loss)			(2.71	)		(1.25	)		0.3
	Distributions			(1.56	)		(1.65	)		(1.74	)
	Discount from shares repurchased			0.04			—	*		—	*
	Net asset value per share—end of period		$	13.62		$	18.15		$	21.38
	Market Value:
	Market value per share—beginning of period		$	15.17		$	19.97		$	20.3
	Market value per share—end of period		$	12.83		$	15.17		$	19.97
	Ratios to Average Net Assets:
	Net investment income (loss)			(1.72	)%		(1.69	)%		(1.74	)%
	Expenses			1.81	%		1.8	%		1.86	%(a)
	Total Returns:(b)
	Based on Net Asset Value			(17.75	)%		(7.57	)%		(0.50	)%
	Based on Market Value			(6.07	)%		(16.64	)%		6.67	%
	(a)	Net of expense reimbursement from the Manager.
	(b)	Total Return Based on Net Asset Value is the combination of changes in net asset value per share and the assumed reinvestment of distributions, if any, at net asset value per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the net asset value per share at the end of the period. Total returns are not annualized.
	Total Return Based on Market Value is the combination of changes in the market price per share and the assumed reinvestment of distributions, if any, at the ending market price per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the ending market price per share at the end of the period. Total returns are not annualized.
	*	Rounds to less than $.01.

Selected_Quarterly_Financial_D

Selected Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Data	7. Selected Quarterly Financial Data (Unaudited)
	The following tables present unaudited quarterly results of operations for the quarters within the fiscal years ended December 31, 2014 and December 31, 2013. These quarterly results reflect all normal recurring adjustments that are, in the opinion of management, necessary for a fair statement of the results of the Fund.
		For the Three Months Ended 2014
		31-Dec			30-Sep			30-Jun			31-Mar
	Total investment income	$	30,617		$	33,081		$	38,311		$	37,292
	Net investment income (loss)	$	(603,136	)	$	(681,941	)	$	(747,737	)	$	(713,847	)
	Net realized gain (loss) and change in net unrealized appreciation (depreciation)	$	(18,531,301	)	$	(17,224,220	)	$	2,887,863		$	7,992,788
	Net income (loss)	$	(19,134,437	)	$	(17,906,161	)	$	2,140,126		$	7,278,941
	Increase (decrease) in net assets	$	(24,689,468	)	$	(21,496,867	)	$	(1,450,580	)	$	3,688,235
	Net income (loss) per weighted average share	$	(2.10	)	$	(1.94	)	$	0.23		$	0.79
		For the Three Months Ended 2013
		December 31			September 30			June 30			March 31
	Total investment income	$	39,886		$	43,001		$	56,393		$	60,660
	Net investment income (loss)	$	(756,721	)	$	(785,789	)	$	(763,445	)	$	(749,613	)
	Net realized gain (loss) and change in net unrealized appreciation (depreciation)	$	(1,602,591	)	$	7,000,507		$	(14,508,974	)	$	(2,430,492	)
	Net income (loss)	$	(2,359,312	)	$	6,214,718		$	(15,272,419	)	$	(3,180,105	)
	Increase (decrease) in net assets	$	(6,141,178	)	$	2,619,218		$	(19,282,789	)	$	(7,190,475	)
	Net income (loss) per weighted average share	$	(0.25	)	$	0.67		$	(1.66	)	$	(0.34	)

Subsequent_Event

Subsequent Event	12 Months Ended
	Dec. 31, 2014
Subsequent Event	8. Subsequent Event
	Distributions
	On February 2, 2015 the Manager announced that the Fund’s regular monthly distribution to shareholders would be reduced from $0.130 per share to $0.103 per share effective with the distribution payable on March 2, 2015.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Basis of Accounting	Basis of Accounting
	The accompanying financial statements have been prepared in conformity with U.S. GAAP. The preparation of financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of increases and decreases in net assets from operations during the reporting period. Actual results could differ from those estimates.
Futures Contracts, Options Contracts and Forward Contracts	Futures Contracts
	The Fund invests in commodity futures contracts. Upon execution of a futures contract, the Fund is obligated to deposit cash or eligible securities, also known as “initial margin,” into an account at its clearing broker. Generally investments in futures contracts also obligate the investor and the clearing broker to settle monies on a daily basis representing changes in the prior days “mark-to-market” of the open contracts. If the Fund has unrealized appreciation the clearing broker would credit the Fund’s account with an amount equal to appreciation and conversely if the Fund has unrealized depreciation the clearing broker would debit the Fund’s account with an amount equal to depreciation. These daily cash settlements are also known as “variation margin.” In lieu of posting variation margin daily, the Fund has deposited cash with the clearing broker, generally representing approximately twice the required initial margin to cover the initial margin and the daily changes in the market value of its futures investments. Cash held by the clearing broker to cover both margin requirements on open futures contracts is recognized as “Deposits with brokers” on the Statements of Financial Condition.
	During the period the futures contract is open, changes in the value of the contract are recognized as an unrealized gain or loss by “marking-to-market” on a daily basis to reflect the changes in market value of the contract, which are recognized as a component of “Unrealized appreciation or depreciation on futures contracts” on the Statements of Financial Condition and “Change in net unrealized appreciation (depreciation) of futures contracts” on the Statements of Operations. When the contract is closed, the Fund records a realized gain or loss equal to the difference between the value of the contract on the closing date and the value of the contract when originally entered into, which is recognized as a component of “Net realized gain (loss) from futures contracts” on the Statements of Operations.
	The Fund expects to invest only in long futures contracts. Some short futures positions may arise in futures contracts traded on the London Metal Exchange (“LME”) solely as the result of closing existing long LME futures positions. For every short LME futures contract outstanding, the Fund had previously entered into a long futures contract. The LME Clearing House is the counterparty for both the long and short positions.
	Risks of investments in commodity futures contracts include possible adverse movement in the price of the commodities underlying the contracts, the possibility that there may not be a liquid secondary market for the contracts and the possibility that a change in the value of the contract may not correlate with a change in the value of the underlying commodities.
	The average number of futures contracts outstanding during the fiscal years ended December 31, 2014 and December 31, 2013 was as follows:
			Year Ended			Year Ended
			December 31, 2014			December 31, 2013
	Average number of futures contracts outstanding*			2,764			3,076
	*	The average number of contracts is calculated based on the number of contracts outstanding at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.
	Refer to Note 3 – Derivative Instruments and Hedging Activities within these Notes to Financial Statements for further details on futures contracts activity.
	Options Contracts
	The Fund may write (sell) and purchase options on commodity futures and forward contracts to enhance the Fund’s risk-adjusted total return. When the Fund writes an option, an amount equal to the premium received is recognized as a component of “Call options written, at value” on the Statements of Financial Condition and is subsequently adjusted to reflect the current value of the written option until the option expires or the Fund enters into a closing purchase transaction. The changes in value of the options written during the reporting period are recognized as a component of “Change in net unrealized appreciation (depreciation) of call options written” on the Statements of Operations. When an option is exercised or expires, or the Fund enters into a closing purchase transaction, the difference between the net premium received and any amount paid at expiration or on executing a closing purchase transaction is recognized as a component of “Net realized gain (loss) from call options written” on the Statements of Operations. The Fund, as writer of an option, has no control over whether the underlying instrument may be sold (called) and as a result bears the risk of an unfavorable change in the market value of the instrument underlying the written option. There is also the risk the Fund may not be able to enter into a closing transaction because of an illiquid market. During the fiscal years ended December 31, 2014 and December 31, 2013, the Fund wrote call options on futures contracts.
	The Fund did not purchase options on futures or forward contracts during the fiscal years ended December 31, 2014 and December 31, 2013. The purchase of options involves the risk of loss of all or part of the cash paid for the options (the premium). The market risk associated with purchasing options is limited to the premium paid. The counterparty credit risk of purchasing options, however, needs to take into account the current value of the option, as this is the performance expected from the counterparty.
	Transactions in call options written during the fiscal years ended December 31, 2014 and December 31, 2013 were as follows:
			Year Ended						Year Ended
			December 31,  2014						December 31, 2013
			Number of			Premiums			Number of			Premiums
			Contracts			Received			Contracts			Received
	Outstanding, beginning of period			1,377		$	777,236			1,537		$	974,047
	Options written			9,114			5,003,593			10,128			5,116,574
	Options terminated in closing purchase transactions			(4,006	)		(1,970,074	)		(5,455	)		(2,788,807	)
	Options expired			(3,848	)		(2,173,528	)		(3,897	)		(2,058,351	)
	Options exercised			(1,380	)		(684,534	)		(936	)		(466,227	)
	Outstanding, end of the period			1,257		$	952,693			1,377		$	777,236
	The average number of call options written outstanding during the fiscal years ended December 31, 2014 and December 31, 2013 was as follows:
			Year Ended			Year Ended
			December 31, 2014			December 31, 2013
	Average number of call options written outstanding*			1,338			1,452
	*	The average number of contracts is calculated based on the outstanding number of contracts at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.
	Refer to Note 3 – Derivative Instruments and Hedging Activities within these Notes to Financial Statements for further details on options activity.
	Forward Contracts
	The Fund may enter into forward contracts but did not make any such investments during the fiscal years ended December 31, 2014 and December 31, 2013. A forward contract is an agreement between two parties to purchase or sell a specified quantity of a commodity at or before a specified date in the future at a specified price. Forward contracts are typically traded in the over-the-counter (“OTC”) markets and all details of the contract are negotiated between the counterparties to the agreement. Accordingly, the forward contracts are valued by reference to the contracts traded in the OTC markets.
	The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity, establishing an opposite position in the contract and recognizing the profit or loss on both positions simultaneously on the delivery date or, in some instances, paying a cash settlement before the designated date of delivery. The forward contracts are adjusted by the daily fluctuation of the underlying commodity or currency and any gains or losses are recognized on the Statements of Operations as unrealized appreciation or depreciation until the contract settlement date.
	Forward contracts are, in general, not cleared or guaranteed by a third party. The Fund may collateralize forward commodity contracts with cash and/or certain securities as indicated on its Statements of Financial Condition or Schedule of Investments, when applicable, and such collateral is held for the benefit of the counterparty in a segregated account at the custodian to protect the counterparty against non-payment by the Fund. In the event of a default by the counterparty, the Fund will seek return of this collateral and may incur certain costs exercising its right with respect to the collateral.
	The Fund remains subject to credit risk with respect to the amount it expects to receive from counterparties, as those amounts are not similarly collateralized by the counterparty. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the Fund may experience significant delays in obtaining any recovery in a bankruptcy or other reorganization proceeding. The Fund may obtain only limited recovery or may obtain no recovery in such circumstances.
	Participants in trading foreign exchange forward contracts often do not require margin deposits, but rely upon internal credit limitations and their judgments regarding the creditworthiness of their counterparties.
	The Fund will enter into forward contracts only with large, well-capitalized and well-established financial institutions. The creditworthiness of each of the firms which is a party to a forward contract is monitored by the Manager.
Netting Agreements	Netting Agreements
	In the ordinary course of business, the Fund has entered into transactions subject to enforceable master repurchase agreements or other similar arrangements (“netting agreements”). Generally, the right to offset in netting agreements allows the Fund to offset any exposure to a specific counterparty with any collateral received or delivered to that counterparty based on the terms of the agreements. The Fund manages its cash collateral and securities collateral on a counterparty basis. As of December 31, 2014 and December 31, 2013, the Fund was not invested in any portfolio securities or derivatives, other than the repurchase agreements further described below, that are subject to netting agreements.
Repurchase Agreements	Repurchase Agreements
	In connection with transactions in repurchase agreements, it is the Fund’s policy that its custodian take possession of the underlying collateral securities, the fair value of which exceeds the principal amount of the repurchase transaction, including accrued interest, at all times. If the counterparty defaults, and the fair value of the collateral declines, realization of the collateral may be delayed or limited.
	The following tables present the repurchase agreements for the Fund, presented on the Statements of Financial Condition as of December 31, 2014 and December 31, 2013, and recognized as a component of “Short-term investments, at value,” that are subject to netting agreements as of the end of each reporting period, and the collateral delivered related to those repurchase agreements.
			December 31, 2014
			Counterparty			Short-Term			Collateral Pledged			Net
						Investments,			(From)			Exposure
						at Value			Counterparty*
	Repurchase Agreements			State Street Bank		$	1,085,421		$	(1,085,421	)	$	—
			31-Dec-13
			Counterparty			Short-Term			Collateral Pledged			Net
						Investments,			(From)			Exposure
						at Value			Counterparty*
	Repurchase Agreements			State Street Bank		$	1,575,280		$	(1,575,280	)	$	—
	*	As of December 31, 2014 and December 31, 2013, the value of the collateral pledged from the counterparty exceeded the value of the repurchase agreements. The value of the collateral pledged from the counterparty as of December 31, 2014 and December 31, 2013 was $1,113,007 and $1,608,072, respectively.
Collateral Investments	Collateral Investments
	Currently, approximately 15% of the Fund’s net assets are committed to secure the Fund’s futures contract positions. These assets are placed in a commodity futures account maintained by the Fund’s clearing broker, and are held in high-quality instruments permitted under CFTC regulations.
	The Fund’s remaining assets are held in a separate collateral investment account managed by the Collateral Sub-adviser. The Fund’s assets held in the separate collateral account are invested in cash equivalents, U.S. government securities and other high-quality short-term debt securities with final terms not exceeding one year at the time of investment. The collateral portfolio’s debt securities (other than U.S. government securities) are rated at the highest applicable rating as determined by at least one nationally recognized statistical rating organization, or if unrated, judged by the Collateral Sub-adviser to be of comparable quality.
Investment Valuation	Investment Valuation
	Commodity futures contracts and options on commodity futures contracts traded on an exchange will be valued at the final settlement price or official closing price as determined by the principal exchange on which the instruments are traded as supplied by independent pricing services. These investments are generally classified as Level 1 for fair value measurement purposes. OTC commodity futures and forward contracts and options on commodity futures and forward contracts not traded on an exchange will be valued, in order of hierarchy, by independent pricing services, price quotations obtained from counterparty broker-dealers, or through fair valuation methodologies as determined by the Manager. These investments are generally classified as Level 2. Additionally, events may occur after the close of the market, but prior to the determination of the Fund’s net asset value, that may affect the values of the Fund’s investments. In such circumstances, the Manager will determine a fair valuation for such investments that in its opinion is reflective of fair market value. These investments are generally classified as Level 2 or Level 3 depending on the priority of the significant inputs.
	Prices of fixed-income securities, including, but not limited to, highly-rated agency discount notes and U.S. Treasury bills, are provided by a pricing service approved by the Fund’s Manager. These securities are generally classified as Level 2. The pricing service establishes a security’s fair value using methods that may include consideration of the following: yields or prices of investments of comparable quality, type of issue, coupon, maturity and rating, market quotes or indications of value from security dealers, general market conditions and other information and analysis, including the obligor’s credit characteristics considered relevant. These securities are generally classified as Level 2 or Level 3 depending on the priority of the significant inputs.
	Repurchase agreements are valued at contract amount plus accrued interest, which approximates market value. These securities are generally classified as Level 2.
Fair Value Measurements	Fair Value Measurements
	Fair value is defined as the price that the Fund would receive upon selling an investment or transferring a liability in an orderly transaction to an independent buyer in the principal or most advantageous market for the investment. A three-tier hierarchy is used to maximize the use of observable market data and minimize the use of unobservable inputs and to establish classification of fair value measurements for disclosure purposes. Observable inputs reflect the assumptions market participants would use in pricing the asset or liability. Observable inputs are based on market data obtained from sources independent of the reporting entity. Unobservable inputs reflect the reporting entity’s own assumptions about the assumptions market participants would use in pricing the asset or liability. Unobservable inputs are based on the best information available in the circumstances. The following is a summary of the three-tier hierarchy of valuation inputs.
	Level 1—Inputs are unadjusted and prices are determined by quoted prices in active markets for identical securities.
	Level 2—Prices are determined using other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).
	Level 3—Prices are determined using significant unobservable inputs (including management’s assumptions in determining the fair value of investments).
	The inputs or methodologies used for valuing securities are not an indication of the risks associated with investing in those securities. The following is a summary of the Fund’s fair value measurements as of December 31, 2014 and December 31, 2013:
			December 31, 2014
			Level 1			Level 2			Level 3			Total
	Short-Term Investments:
	U.S. Government and Agency Obligations		$	—		$	112,651,962		$	—		$	112,651,962
	Repurchase Agreements			—			1,085,421			—			1,085,421
	Investments in Derivatives:
	Futures Contracts*			(10,837,633	)		—			—			(10,837,633	)
	Call Options Written**			(296,775	)		(132	)		—			(296,907	)
	Total		$	(11,134,408	)	$	113,737,251		$	—		$	102,602,843
			31-Dec-13
			Level 1			Level 2			Level 3			Total
	Short-Term Investments:
	U.S. Government and Agency Obligations		$	—		$	139,663,104		$	—		$	139,663,104
	Repurchase Agreements			—			1,575,280			—			1,575,280
	Investments in Derivatives:
	Futures Contracts*			1,879,014			—			—			1,879,014
	Call Options Written			(779,835	)		(249,932	)		—			(1,029,767	)
	Total		$	1,099,179		$	140,988,452		$	—		$	142,087,631
	*	Represents the net unrealized appreciation (depreciation) of futures contracts as reported on the Statements of Financial Condition.
	**	Refer to the Schedule of Investments for a breakdown of call options written classified as Level 2, which is comprised of the Fund’s call options written on the LME.
	The Manager is responsible for the Fund’s valuation process and has delegated daily oversight of the process to the Manager’s Valuation Committee. The Valuation Committee, pursuant to its valuation policies and procedures, is responsible for making fair value determinations, evaluating the effectiveness of the Fund’s pricing policies, and reporting to the Manager’s senior management. The Valuation Committee is aided in its efforts by the Manager’s Securities Valuation Team, which is responsible for administering the daily valuation process and applying fair value methodologies as approved by the Valuation Committee. When determining the reliability of independent pricing services for investments owned by the Fund, the Valuation Committee, among other things, conducts due diligence reviews of the pricing services and monitors the quality of security prices received through various testing reports conducted by the Securities Valuation Team.
	For each portfolio instrument that has been fair valued pursuant to the Valuation Committee’s policies, the fair value price is compared against the last available and next available market quotations. The Valuation Committee reviews the results of such testing and fair valuation occurrences are reported to the Manager’s senior management.
Investment Transactions	Investment Transactions
	Investment transactions are recorded on a trade date basis. Realized gains and losses from investment transactions are determined on the specific identification method, which is the same for federal income tax purposes.
Investment Income	Investment Income
	Interest income, which reflects the amortization of premiums and includes accretion of discounts for financial reporting purposes, is recorded on an accrual basis.
Brokerage Commissions and Fees	Brokerage Commissions and Fees
	The Fund pays brokerage commissions, including applicable clearing costs, exchange fees, NFA fees, give-up fees, pit brokerage fees and other transaction-related fees and expenses, incurred in connection with its commodity trading activities.
Income Taxes	Income Taxes
	No provision for federal, state, and local income taxes has been made in the accompanying financial statements because the Fund has elected to be classified as a partnership for U.S. federal income tax purposes. Each owner of the Fund’s shares will be required to take into account its allocable share of the Fund’s income, gains, losses, deductions and other items for the Fund’s taxable year.
	For all open tax years and all major taxing jurisdictions, the Manager of the Fund has concluded that there are no significant uncertain tax positions that would require recognition in the financial statements. Open tax years are those that are open for examination by taxing authorities (i.e., generally the last four tax year ends and the interim tax period since then). Furthermore, the Manager of the Fund is also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months.
Expense Recognition	Expense Recognition
	All expenses of the Fund are recognized on an accrual basis. The Fund pays all routine and extraordinary costs and expenses of its operations, brokerage expenses, custody fees, transfer agent expenses, professional fees, expenses of preparing, printing and distributing reports, notices, information statements, proxy statements, reports to governmental agencies, and taxes, if any.
Offering Costs	Offering Costs
	During April 2011, the Fund filed a Registration Statement on Form S-1 with the SEC to register additional shares of the Fund for future issuance. Costs incurred by the Fund in 2011 and 2012 in connection with the planned offering were recorded as a deferred charge and recognized as a component of “Other assets” on the Statements of Financial Condition during the fiscal year ended December 31, 2011. Due to adverse market conditions the offering did not take place and the Fund withdrew the Form S-1 filing during October 2012. As a result, the costs incurred by the Fund were expensed in 2012 since they would not benefit the Fund in a future offering and the Manager reimbursed the Fund for half of such costs. These costs are recognized as “Offering costs” on the Statements of Operations.
Calculation of Net Asset Value	Calculation of Net Asset Value
	The net asset value per share of the Fund on any given day is computed by dividing the value of all assets of the Fund (including any accrued interest), less all liabilities (including accrued expenses and distributions declared but unpaid), by the total number of shares outstanding.
Distributions	Distributions
	The Fund intends to make regular monthly distributions to its shareholders stated in terms of a fixed cents per share distribution rate. Among other factors, the Manager seeks to establish a distribution rate that roughly corresponds to its projections of the total return that could reasonably be expected to be generated by the Fund over an extended period of time. In the event that the amount of income earned or capital gains realized by the Fund is not sufficient to cover the Fund’s distributions, the Fund may be required to liquidate investments to fund distributions at times or on terms that are disadvantageous to the Fund and its shareholders. As market conditions and portfolio performance may change, the rate of distribution on the shares and the Fund’s distribution policy could change. The Manager reserves the right to change the Fund’s distribution policy and the basis for establishing the rate of the Fund’s monthly distributions, or may temporarily suspend or reduce distributions without a change in policy, at any time and may do so without prior notice to shareholders.
	Distributions to shareholders are recorded on the ex-dividend date.
Commitments and Contingencies	Commitments and Contingencies
	Under the Fund’s organizational documents, the Manager, Wilmington Trust Company (the Fund’s Delaware trustee) and the Manager’s Independent Committee members are indemnified against certain liabilities arising out of the performance of their duties to the Fund. In addition, in the normal course of business, the Fund enters into contracts that provide general indemnifications to other parties. The Fund’s maximum exposure under these arrangements is unknown, as this would involve future claims that may be made against the Fund that have not yet occurred. However, the Fund has not had prior claims or losses pursuant to these contracts and believes the risk of loss to be remote.
Financial Instrument Risk	Financial Instrument Risk
	The Fund utilizes commodity futures and options, whose values are based upon an underlying asset and generally represent future commitments that have a reasonable possibility of being settled in cash or through physical delivery. As of December 31, 2014 and December 31, 2013, the financial instruments held by the Fund were traded on an exchange and are standardized contracts.
	Market risk is the potential for changes in the value of the financial instruments traded by the Fund due to market changes, including fluctuations in commodity prices. Investing in commodity futures and forward contracts involves the Fund entering into contractual commitments to purchase or sell a particular commodity at a specified date and price. The market risk associated with the Fund’s commitments to purchase commodities will be limited to the gross or face amount of the contracts held. The Fund’s exposure to market risk may be influenced by a number of factors, including changes in international balances of payments and trade, currency devaluations and revaluations, changes in interest and foreign currency exchange rates, price volatility of commodity futures and forwards contracts and market liquidity, weather, geopolitical events and other factors. These factors also affect the Fund’s investments in options on commodity futures and forward contracts. The inherent uncertainty of the Fund’s investments as well as the development of drastic market occurrences could ultimately lead to a loss of all, or substantially all, of investors’ capital.
	Credit risk is the possibility that a loss may occur due to failure of a counterparty performing according to the terms of the forwards, futures and option contracts. The Fund may be exposed to credit risk from its investments in commodity futures and forward contracts and options on commodity futures and forward contracts resulting from the clearing house associated with a particular exchange failing to meet its obligations to the Fund. In general, clearing houses are backed by their corporate members who may be required to share in the financial burden resulting from the nonperformance of one of their members, which should significantly reduce this credit risk. In cases where the clearing house is not backed by the clearing members (i.e., as in some foreign exchanges), it may be backed by a consortium of banks or other financial institutions. There can be no assurance that any counterparty, clearing member or clearing house will meet its obligations to the Fund.
	The commodity markets have volatility risk. The commodity markets have experienced periods of extreme volatility. General market uncertainty and consequent repricing risk have led to market imbalances of sellers and buyers, which in turn have resulted in significant reductions in values of a variety of commodities. Similar future market conditions may result in rapid and substantial valuation increases or decreases in the Fund’s holdings. In addition, volatility in the commodity and securities markets may directly and adversely affect the setting of distribution rates on the Fund’s shares.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Transactions in Call Options	Transactions in call options written during the fiscal years ended December 31, 2014 and December 31, 2013 were as follows:
			Year Ended						Year Ended
			December 31,  2014						December 31, 2013
			Number of			Premiums			Number of			Premiums
			Contracts			Received			Contracts			Received
	Outstanding, beginning of period			1,377		$	777,236			1,537		$	974,047
	Options written			9,114			5,003,593			10,128			5,116,574
	Options terminated in closing purchase transactions			(4,006	)		(1,970,074	)		(5,455	)		(2,788,807	)
	Options expired			(3,848	)		(2,173,528	)		(3,897	)		(2,058,351	)
	Options exercised			(1,380	)		(684,534	)		(936	)		(466,227	)
	Outstanding, end of the period			1,257		$	952,693			1,377		$	777,236
Repurchase Agreements for Fund and Collateral of Repurchase Agreements	The following tables present the repurchase agreements for the Fund, presented on the Statements of Financial Condition as of December 31, 2014 and December 31, 2013, and recognized as a component of “Short-term investments, at value,” that are subject to netting agreements as of the end of each reporting period, and the collateral delivered related to those repurchase agreements.
			December 31, 2014
			Counterparty			Short-Term			Collateral Pledged			Net
						Investments,			(From)			Exposure
						at Value			Counterparty*
	Repurchase Agreements			State Street Bank		$	1,085,421		$	(1,085,421	)	$	—
			31-Dec-13
			Counterparty			Short-Term			Collateral Pledged			Net
						Investments,			(From)			Exposure
						at Value			Counterparty*
	Repurchase Agreements			State Street Bank		$	1,575,280		$	(1,575,280	)	$	—
	*	As of December 31, 2014 and December 31, 2013, the value of the collateral pledged from the counterparty exceeded the value of the repurchase agreements. The value of the collateral pledged from the counterparty as of December 31, 2014 and December 31, 2013 was $1,113,007 and $1,608,072, respectively.
Fund's Fair Value Measurement	The following is a summary of the Fund’s fair value measurements as of December 31, 2014 and December 31, 2013:
			December 31, 2014
			Level 1			Level 2			Level 3			Total
	Short-Term Investments:
	U.S. Government and Agency Obligations		$	—		$	112,651,962		$	—		$	112,651,962
	Repurchase Agreements			—			1,085,421			—			1,085,421
	Investments in Derivatives:
	Futures Contracts*			(10,837,633	)		—			—			(10,837,633	)
	Call Options Written**			(296,775	)		(132	)		—			(296,907	)
	Total		$	(11,134,408	)	$	113,737,251		$	—		$	102,602,843
			31-Dec-13
			Level 1			Level 2			Level 3			Total
	Short-Term Investments:
	U.S. Government and Agency Obligations		$	—		$	139,663,104		$	—		$	139,663,104
	Repurchase Agreements			—			1,575,280			—			1,575,280
	Investments in Derivatives:
	Futures Contracts*			1,879,014			—			—			1,879,014
	Call Options Written			(779,835	)		(249,932	)		—			(1,029,767	)
	Total		$	1,099,179		$	140,988,452		$	—		$	142,087,631
	*	Represents the net unrealized appreciation (depreciation) of futures contracts as reported on the Statements of Financial Condition.
	**	Refer to the Schedule of Investments for a breakdown of call options written classified as Level 2, which is comprised of the Fund’s call options written on the LME.
Futures Contracts
Average Number of Contracts Outstanding	The average number of futures contracts outstanding during the fiscal years ended December 31, 2014 and December 31, 2013 was as follows:
			Year Ended			Year Ended
			December 31, 2014			December 31, 2013
	Average number of futures contracts outstanding*			2,764			3,076
	*	The average number of contracts is calculated based on the number of contracts outstanding at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.
Short | Call Options
Average Number of Contracts Outstanding	The average number of call options written outstanding during the fiscal years ended December 31, 2014 and December 31, 2013 was as follows:
			Year Ended			Year Ended
			December 31, 2014			December 31, 2013
	Average number of call options written outstanding*			1,338			1,452
	*	The average number of contracts is calculated based on the outstanding number of contracts at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value of All Derivative Instruments Held By Fund	The following tables present the fair value of all derivative instruments held by the Fund as of December 31, 2014 and December 31, 2013, the location of these instruments on the Statements of Financial Condition and the primary underlying risk exposure.
				December 31, 2014
				Location on the Statements of Financial Condition
	Underlying	Derivative		Asset Derivatives				Liability Derivatives
	Risk Exposure	Instrument		Location	Value			Location		Value
	Commodity	Futures Contracts		Unrealized appreciation on futures contracts	$	633,319		Unrealized depreciation on futures contracts		$	11,470,952
	Commodity	Options		—		—		Call options written, at value			296,907
	Total				$	633,319				$	11,767,859
				December 31, 2013
				Location on the Statements of Financial Condition
	Underlying	Derivative		Asset Derivatives				Liability Derivatives
	Risk Exposure	Instrument		Location	Value			Location		Value
	Commodity	Futures Contracts		Unrealized appreciation on futures contracts	$	3,905,844		Unrealized depreciation on futures contracts		$	2,026,830
	Commodity	Options		—		—		Call options written, at value			1,029,767
	Total				$	3,905,844				$	3,056,597
Net Realized Gain (Loss) and Change in Net Unrealized Appreciation (Depreciation) Recognized on Derivative Instruments	The following table presents the amount of net realized gain (loss) and change in net unrealized appreciation (depreciation) recognized on derivative instruments during the fiscal years ended December 31, 2014, December 31, 2013 and December 31, 2012, the location of these instruments on the Statements of Operations and the primary underlying risk exposure.
	Commodity Risk Exposure	Year Ended			Year Ended			Year Ended
		December 31, 2014			December 31, 2013			December 31, 2012
	Net realized gain (loss) from:
	Futures contracts	$	(16,873,345	)	$	(21,217,789	)	$	(5,031,471	)
	Call options written		3,826,262			4,711,122			7,166,083
	Change in net unrealized appreciation (depreciation) of:
	Futures contracts	$	(12,716,647	)	$	5,662,047		$	1,138,797
	Call options written		908,317			-690,565			-438,556

Related_Parties_Tables

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2014
Management Fee According to Fund's Average Daily Net Assets	For the services and facilities provided by the Manager, the Fund pays the Manager an annual management fee, payable monthly, based on the Fund’s average daily net assets, according to the following schedule:
	Average Daily Net Assets	Management Fee
	For the first $500 million		1.25	%
	For the next $500 million		1.225
	For the next $500 million		1.2
	For the next $500 million		1.175
	For net assets over $2 billion		1.15
	“Average daily net assets” represents the total assets of the Fund, minus the sum of its total liabilities.

Share_Repurchase_Program_Table

Share Repurchase Program (Tables)	12 Months Ended
	Dec. 31, 2014
Transactions In Share Repurchases	Transactions in share repurchases during the fiscal years ended December 31, 2014, December 31, 2013 and December 31, 2012, were as follows:
		Year Ended			Year Ended			Year Ended
		December 31,  2014			December 31,  2013			December 31, 2012
	Shares repurchased		159,900			12,300			9,800
	Weighted average price per share repurchased	$	12.5		$	15.16		$	20.77
	Weighted average discount per share repurchased		18.14	%		17.1	%		12.12	%

Financial_Highlights_Tables

Financial Highlights (Tables)	12 Months Ended
	Dec. 31, 2014
Schedule of Net Asset Value, Market Value, Ratios to Average Net Assets, and Total Returns	The Total Returns at Net Asset Value and Market Value are based on the change in net asset value and market value, respectively, for a share during the period. An investor’s return and ratios will vary based on the timing of purchasing and selling Fund shares.
			Year Ended December 31,
			2014			2013			2012
	Net Asset Value:
	Net asset value per share—beginning of period		$	18.15		$	21.38		$	23.21
	Net investment income (loss)			(0.30	)		(0.33	)		(0.39	)
	Net realized and unrealized gain (loss)			(2.71	)		(1.25	)		0.3
	Distributions			(1.56	)		(1.65	)		(1.74	)
	Discount from shares repurchased			0.04			—	*		—	*
	Net asset value per share—end of period		$	13.62		$	18.15		$	21.38
	Market Value:
	Market value per share—beginning of period		$	15.17		$	19.97		$	20.3
	Market value per share—end of period		$	12.83		$	15.17		$	19.97
	Ratios to Average Net Assets:
	Net investment income (loss)			(1.72	)%		(1.69	)%		(1.74	)%
	Expenses			1.81	%		1.8	%		1.86	%(a)
	Total Returns:(b)
	Based on Net Asset Value			(17.75	)%		(7.57	)%		(0.50	)%
	Based on Market Value			(6.07	)%		(16.64	)%		6.67	%
	(a)	Net of expense reimbursement from the Manager.
	(b)	Total Return Based on Net Asset Value is the combination of changes in net asset value per share and the assumed reinvestment of distributions, if any, at net asset value per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the net asset value per share at the end of the period. Total returns are not annualized.
	Total Return Based on Market Value is the combination of changes in the market price per share and the assumed reinvestment of distributions, if any, at the ending market price per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the ending market price per share at the end of the period. Total returns are not annualized.
	*	Rounds to less than $.01.

Selected_Quarterly_Financial_D1

Selected Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Quarterly Results of Operations	The following tables present unaudited quarterly results of operations for the quarters within the fiscal years ended December 31, 2014 and December 31, 2013. These quarterly results reflect all normal recurring adjustments that are, in the opinion of management, necessary for a fair statement of the results of the Fund.
		For the Three Months Ended 2014
		31-Dec			30-Sep			30-Jun			31-Mar
	Total investment income	$	30,617		$	33,081		$	38,311		$	37,292
	Net investment income (loss)	$	(603,136	)	$	(681,941	)	$	(747,737	)	$	(713,847	)
	Net realized gain (loss) and change in net unrealized appreciation (depreciation)	$	(18,531,301	)	$	(17,224,220	)	$	2,887,863		$	7,992,788
	Net income (loss)	$	(19,134,437	)	$	(17,906,161	)	$	2,140,126		$	7,278,941
	Increase (decrease) in net assets	$	(24,689,468	)	$	(21,496,867	)	$	(1,450,580	)	$	3,688,235
	Net income (loss) per weighted average share	$	(2.10	)	$	(1.94	)	$	0.23		$	0.79
		For the Three Months Ended 2013
		December 31			September 30			June 30			March 31
	Total investment income	$	39,886		$	43,001		$	56,393		$	60,660
	Net investment income (loss)	$	(756,721	)	$	(785,789	)	$	(763,445	)	$	(749,613	)
	Net realized gain (loss) and change in net unrealized appreciation (depreciation)	$	(1,602,591	)	$	7,000,507		$	(14,508,974	)	$	(2,430,492	)
	Net income (loss)	$	(2,359,312	)	$	6,214,718		$	(15,272,419	)	$	(3,180,105	)
	Increase (decrease) in net assets	$	(6,141,178	)	$	2,619,218		$	(19,282,789	)	$	(7,190,475	)
	Net income (loss) per weighted average share	$	(0.25	)	$	0.67		$	(1.66	)	$	(0.34	)

Average_Number_of_Futures_Cont

Average Number of Futures Contracts Outstanding (Detail) (Futures Contracts)	Dec. 31, 2014		Dec. 31, 2013
	Contract		Contract
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Average number of derivative contracts outstanding	2,585	[1]
Average
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Average number of derivative contracts outstanding	2,764	[2]	3,076	[2]
[1]	Total number of contracts and notional amount at value include the net effect of LME short futures positions, when applicable.
[2]	The average number of contracts is calculated based on the number of contracts outstanding at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.

Transactions_in_Call_Options_D

Transactions in Call Options (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Contract	Contract
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Outstanding, end of the period, Premiums Received	$952,693	$777,236
Call Options | Short
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Outstanding, beginning of period, Number of Contracts	1,377	1,537
Options written, Number of Contracts	9,114	10,128
Options terminated in closing purchase transactions, Number of Contracts	-4,006	-5,455
Options expired, Number of Contracts	-3,848	-3,897
Options exercised, Number of Contracts	-1,380	-936
Outstanding, end of the period, Number of Contracts	1,257	1,377
Outstanding, beginning of period, Premiums Received	777,236	974,047
Options written, Premiums Received	5,003,593	5,116,574
Options terminated in closing purchase transactions, Premiums Received	-1,970,074	-2,788,807
Options expired, Premiums Received	-2,173,528	-2,058,351
Options exercised, Premiums Received	-684,534	-466,227
Outstanding, end of the period, Premiums Received	$952,693	$777,236

Average_Number_of_Call_Options

Average Number of Call Options Written Outstanding (Detail) (Call Options, Average)	Dec. 31, 2014		Dec. 31, 2013
	Contract		Contract
Call Options | Average
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Average number of derivative contracts outstanding	1,338	[1]	1,452	[1]
[1]	The average number of contracts is calculated based on the outstanding number of contracts at the beginning of the fiscal year and at the end of each quarter within the current fiscal year.

Repurchase_Agreements_for_Fund

Repurchase Agreements for Fund and Collateral of Repurchase Agreements (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Repurchase Agreement [Line Items]
Short-Term Investments, at Value	$113,737,383		$141,238,384
Repurchase Agreements
Repurchase Agreement [Line Items]
Counterparty	State Street Bank		State Street Bank
Short-Term Investments, at Value	1,085,421		1,575,280
Collateral Pledged (From) Counterparty	-1,085,421	[1]	-1,575,280	[1]
Net Exposure	$0		$0
[1]	As of December 31, 2014 and December 31, 2013, the value of the collateral pledged from the counterparty exceeded the value of the repurchase agreements. The value of the collateral pledged from the counterparty as of December 31, 2014 and December 31, 2013 was $1,113,007 and $1,608,072, respectively.

Repurchase_Agreements_for_Fund1

Repurchase Agreements for Fund and Collateral of Repurchase Agreements (Parenthetical) (Detail) (Repurchase Agreements, USD $)	Dec. 31, 2014	Dec. 31, 2013
Repurchase Agreements
Repurchase Agreement [Line Items]
Securities received as collateral, value	$1,113,007	$1,608,072

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Percentage of Fund's net assets committed to secure Fund's futures and forward contract positions	15.00%
Period of assets invested in cash equivalents	Not exceeding one year

Summary_of_Funds_Fair_Value_Me

Summary of Fund's Fair Value Measurements (Detail) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	$102,602,843		$142,087,631
Short-term Investments	113,737,383		141,238,384
U.S. Government and Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term Investments	112,651,962		139,663,104
Repurchase Agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term Investments	1,085,421		1,575,280
Futures Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Fair Value	-10,837,633	[1]	1,879,014	[1]
Call Options Written
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Fair Value	-296,907	[2]	-1,029,767
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	-11,134,408		1,099,179
Level 1 | Futures Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Fair Value	-10,837,633	[1]	1,879,014	[1]
Level 1 | Call Options Written
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Fair Value	-296,775	[2]	-779,835
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	113,737,251		140,988,452
Level 2 | U.S. Government and Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term Investments	112,651,962		139,663,104
Level 2 | Repurchase Agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term Investments	1,085,421		1,575,280
Level 2 | Call Options Written
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Derivative Fair Value	($132)	[2]	($249,932)
[1]	Represents the net unrealized appreciation (depreciation) of futures contracts as reported on the Statements of Financial Condition.
[2]	Refer to the Schedule of Investments for a breakdown of call options written classified as Level 2, which is comprised of the Fund's call options written on the LME.

Fair_Value_of_Derivative_Instr

Fair Value of Derivative Instruments Held by Fund (Detail) (Commodity Contracts, USD $)	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$633,319	$3,905,844
Total Liability Derivatives	11,767,859	3,056,597
Futures Contracts
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	633,319	3,905,844
Total Liability Derivatives	11,470,952	2,026,830
Call Options Written
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	$296,907	$1,029,767

Net_Realized_Gain_Loss_and_Cha

Net Realized Gain (Loss) and Change In Net Unrealized Appreciation (Depreciation) Recognized on Derivative Instruments and Primary Underlying Risk Exposure (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net realized gain (loss) from:
Futures contracts	($16,873,345)	($21,217,789)	($5,031,471)
Call options written	3,826,262	4,711,122	7,166,083
Change in net unrealized appreciation (depreciation) of:
Futures contracts	-12,716,647	5,662,047	1,138,797
Call options written	$908,317	($690,565)	($438,556)

Related_Parties_Detail

Related Parties (Detail)	Dec. 31, 2014
For the first $500 million
Management Fees Provided For Service [Line Items]
Management Fee Percentage	1.25%
For the next $500 million
Management Fees Provided For Service [Line Items]
Management Fee Percentage	1.23%
For the next $500 million
Management Fees Provided For Service [Line Items]
Management Fee Percentage	1.20%
For the next $500 million
Management Fees Provided For Service [Line Items]
Management Fee Percentage	1.18%
For net assets over $2 billion
Management Fees Provided For Service [Line Items]
Management Fee Percentage	1.15%

Share_Repurchase_Program_Addit

Share Repurchase Program - Additional Information (Detail)	Mar. 06, 2014	Dec. 21, 2011
Share Repurchases [Line Items]
Percentage of outstanding common shares available for repurchase	10.00%	10.00%
Outstanding common shares	920,000	920,000

Transactions_in_Share_Repurcha

Transactions in Share Repurchases (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share Repurchases [Line Items]
Shares repurchased	159,900	12,300	9,800
Weighted average price per share repurchased	$12.50	$15.16	$20.77
Weighted average discount per share repurchased	18.14%	17.10%	12.12%

Financial_Highlights_Detail

Financial Highlights (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Net Asset Value:
Net asset value per share-beginning of period	$18.15		$21.38		$23.21
Net investment income (loss)	($0.30)		($0.33)		($0.39)
Net realized and unrealized gain (loss)	($2.71)		($1.25)		$0.30
Distributions	($1.56)		($1.65)		($1.74)
Discount from shares repurchased	$0.04
Net asset value per share-end of period	$13.62		$18.15		$21.38
Market Value:
Market value per share-beginning of period	$15.17		$19.97		$20.30
Market value per share-end of period	$12.83		$15.17		$19.97
Ratios to Average Net Assets:
Net investment income (loss)	-1.72%		-1.69%		-1.74%
Expenses	1.81%		1.80%		1.86%	[1]
Total Returns:
Based on Net Asset Value	-17.75%	[2]	-7.57%	[2]	-0.50%	[2]
Based on Market Value	-6.07%	[2]	-16.64%	[2]	6.67%	[2]
[1]	Net of expense reimbursement from the Manager.
[2]	Total Return Based on Net Asset Value is the combination of changes in net asset value per share and the assumed reinvestment of distributions, if any, at net asset value per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the net asset value per share at the end of the period. Total returns are not annualized. Total Return Based on Market Value is the combination of changes in the market price per share and the assumed reinvestment of distributions, if any, at the ending market price per share on the distribution payment date. The last distribution declared in the period, which is typically paid on the first business day of the following month, is assumed to be reinvested at the ending market price per share at the end of the period. Total returns are not annualized.

Quarterly_Results_of_Operation

Quarterly Results of Operations (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Line Items]
Total Investment Income	$30,617	$33,081	$38,311	$37,292	$39,886	$43,001	$56,393	$60,660	$139,301	$199,940	$248,744
Net investment income (loss)	-603,136	-681,941	-747,737	-713,847	-756,721	-785,789	-763,445	-749,613	-2,746,661	-3,055,568	-3,626,137
Net realized gain (loss) and change in net unrealized appreciation (depreciation)	-18,531,301	-17,224,220	2,887,863	7,992,788	-1,602,591	7,000,507	-14,508,974	-2,430,492	-24,874,870	-11,541,550	2,833,162
Net income (loss)	-19,134,437	-17,906,161	2,140,126	7,278,941	-2,359,312	6,214,718	-15,272,419	-3,180,105	-27,621,531	-14,597,118	-792,975
Increase (decrease) in net assets	($24,689,468)	($21,496,867)	($1,450,580)	$3,688,235	($6,141,178)	$2,619,218	($19,282,789)	($7,190,475)
Net income (loss) per weighted average share	($2.10)	($1.94)	$0.23	$0.79	($0.25)	$0.67	($1.66)	($0.34)	($3.01)	($1.58)	($0.09)

Subsequent_Event_Additional_In

Subsequent Event - Additional Information (Detail) (Subsequent Event, USD $)	0 Months Ended
	Feb. 02, 2015	Feb. 02, 2015
Subsequent Event [Line Items]
Monthly distribution to shareholders, per share	$0.10	$0.10
Fund's distribution to shareholders after decrease, effective distribution payable date	2-Mar-15
Before Reduction
Subsequent Event [Line Items]
Monthly distribution to shareholders, per share	$0.13	$0.13