United States Copper Index Fund (CPER) 10-Q12 May 142014 Q1 Quarterly reportFinancial data

Company Profile

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
Document And Entity Information	Mar. 31, 2014
Document Information [Line Items]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	31-Mar-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q1
Trading Symbol	'USCI
Entity Common Stock, Shares Outstanding	0
Entity Registrant Name	'United States Commodity Index Funds Trust
Entity Central Index Key	'0001479247
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Accelerated Filer

Condensed_Statements_of_Financ

Condensed Statements of Financial Condition (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
Condensed Statements of Financial Condition (USD $)	Mar. 31, 2014	Dec. 31, 2013	United States Commodity Index Fund [Member]	United States Commodity Index Fund [Member]	United States Copper Index Fund [Member]	United States Copper Index Fund [Member]	United States Agriculture Index Fund [Member]	United States Agriculture Index Fund [Member]	United States Metals Index Fund [Member]	United States Metals Index Fund [Member]
Assets	'	'	'	'	'	'	'	'	'	'
Cash and cash equivalents (Notes 2 and 6)	$526,519,324	$480,181,509	$519,580,429	$474,123,523	$2,772,092	$2,040,735	$2,272,180	$2,098,545	$1,894,623	$1,918,706
Equity in Newedge trading accounts:	'	'	'	'	'	'	'	'	'	'
Cash and cash equivalents	44,001,014	21,002,192	43,088,258	20,316,553	390,269	125,960	207,895	230,081	314,592	329,598
Unrealized gain on open commodity futures contracts	9,333,100	10,829,084	9,307,123	10,789,747	-95,737	130,163	145,490	-44,533	-23,776	-46,293
Receivable for shares sold	0	8,491,911	0	8,491,911	'	'	'	'	'	'
Receivable from Sponsor (Note 4)	23,362	245,726	'	'	14,268	81,789	4,511	81,772	4,583	82,165
Interest receivable	1,343	1,343	1,261	1,261	25	25	46	46	11	11
Other assets	45,819	8,154	45,182	8,045	204	36	211	36	222	37
Total assets	579,923,962	520,759,919	572,022,253	513,731,040	3,081,121	2,378,708	2,630,333	2,365,947	2,190,255	2,284,224
Liabilities and Capital	'	'	'	'	'	'	'	'	'	'
Management fees payable (Note 4)	457,495	407,590	453,052	403,494	1,365	1,229	1,765	1,570	1,313	1,297
Professional fees payable	228,249	599,873	202,329	343,663	15,120	85,228	5,400	85,350	5,400	85,632
Brokerage commissions payable	22,815	22,815	22,815	22,815	'	'	'	'	'	'
Directors' fees payable	18,801	16,107	18,561	15,894	62	52	98	88	80	73
Other liabilities	152	152	152	152	'	'	'	'	'	'
Total liabilities	727,512	1,046,537	696,909	786,018	16,547	86,509	7,263	87,008	6,793	87,002
Commitments and Contingencies (Notes 4, 5 and 6)	'	'	'	'	'	'	'	'	'	'
Capital	'	'	'	'	'	'	'	'	'	'
Sponsor	0	0	0	0	0	0	0	0	0	0
Shareholders	579,196,450	519,713,382	571,325,344	512,945,022	3,064,574	2,292,199	2,623,070	2,278,939	2,183,462	2,197,222
Total Capital	579,196,450	519,713,382	571,325,344	512,945,022	3,064,574	2,292,199	2,623,070	2,278,939	2,183,462	2,197,222
Total liabilities and capital	$579,923,962	$520,759,919	$572,022,253	$513,731,040	$3,081,121	$2,378,708	$2,630,333	$2,365,947	$2,190,255	$2,284,224
Shares outstanding	10,100,000	9,450,000	9,750,000	9,150,000	150,000	100,000	100,000	100,000	100,000	100,000
Net asset value per share	'	'	$58.60	$56.06	$20.43	$22.92	$26.23	$22.79	$21.83	$21.97
Market value per share	'	'	$58.61	$56.08	$20.54	$22.90	$25.58	$22.35	$21.62	$21.02

Condensed_Schedule_of_Investme

Condensed Schedule of Investments (USD $)	Mar. 31, 2014
Condensed Schedule of Investments (USD $)	Number
Number of Contracts	70	[1]
Unrealized Gain (Loss) on Open Commodity Contracts	$145,490	[1]
% of Capital	5.55%	[1]
United States Commodity Index Fund [Member]	'
Number of Contracts	16,564	[2]
Unrealized Gain (Loss) on Open Commodity Contracts	9,307,123	[2]
% of Capital	1.63%	[2]
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member]	'
Number of Contracts	7,309
Unrealized Gain (Loss) on Open Commodity Contracts	-582,165
% of Capital	-0.10%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Number of Contracts	711
Unrealized Gain (Loss) on Open Commodity Contracts	-2,984,213
% of Capital	-0.52%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX April 2014 contracts, expiring April 2014	'
Number of Contracts	790
Unrealized Gain (Loss) on Open Commodity Contracts	-178,081
% of Capital	-0.03%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL June 2014 contracts, expiring June 2014	'
Number of Contracts	662
Unrealized Gain (Loss) on Open Commodity Contracts	-2,654,838
% of Capital	-0.47%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cocoa Futures CC July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	1,362
Unrealized Gain (Loss) on Open Commodity Contracts	322,110
% of Capital	0.06%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cotton #2 Futures CT July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	887
Unrealized Gain (Loss) on Open Commodity Contracts	5,742,995
% of Capital	1.00%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Tin Futures LT July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	345
Unrealized Gain (Loss) on Open Commodity Contracts	-1,141,165
% of Capital	-0.20%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX August 2014 contracts, expiring August 2014 [Member]	'
Number of Contracts	820
Unrealized Gain (Loss) on Open Commodity Contracts	202,338
% of Capital	0.04%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX September 2014 contracts, expiring September 2014 [Member]	'
Number of Contracts	750
Unrealized Gain (Loss) on Open Commodity Contracts	-102,925
% of Capital	-0.02%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE Brent Crude Oil Futures CO December 2014 contracts, expiring November 2014 [Member]	'
Number of Contracts	389
Unrealized Gain (Loss) on Open Commodity Contracts	58,520
% of Capital	0.01%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Coffee-C Futures KC December 2014 contracts, expiring December 2014 [Member]	'
Number of Contracts	593
Unrealized Gain (Loss) on Open Commodity Contracts	153,094
% of Capital	0.03%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member]	'
Number of Contracts	5,997
Unrealized Gain (Loss) on Open Commodity Contracts	7,620,452
% of Capital	1.33%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Live Cattle Futures LC June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	736
Unrealized Gain (Loss) on Open Commodity Contracts	1,552,220
% of Capital	0.27%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Meal Futures SM July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	894
Unrealized Gain (Loss) on Open Commodity Contracts	700,120
% of Capital	0.12%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Lean Hogs Futures LH July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	822
Unrealized Gain (Loss) on Open Commodity Contracts	4,471,980
% of Capital	0.78%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	547
Unrealized Gain (Loss) on Open Commodity Contracts	272,550
% of Capital	0.05%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX Platinum Futures PL July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	576
Unrealized Gain (Loss) on Open Commodity Contracts	446,190
% of Capital	0.08%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Feeder Cattle Futures FC August 2014 contracts, expiring August 2014 [Member]	'
Number of Contracts	449
Unrealized Gain (Loss) on Open Commodity Contracts	-246,438
% of Capital	-0.04%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Futures S November 2014 contracts, expiring November 2014 [Member]	'
Number of Contracts	679
Unrealized Gain (Loss) on Open Commodity Contracts	706,050
% of Capital	0.12%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX WTI Crude Oil Futures CL December 2014 contracts, expiring November 2014 [Member]	'
Number of Contracts	431
Unrealized Gain (Loss) on Open Commodity Contracts	239,380
% of Capital	0.04%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]	'
Number of Contracts	863
Unrealized Gain (Loss) on Open Commodity Contracts	-521,600
% of Capital	-0.09%
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member]	'
Number of Contracts	3,258	[3]
Unrealized Gain (Loss) on Open Commodity Contracts	2,268,836	[3]
% of Capital	0.40%	[3]
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Number of Contracts	711	[3]
Unrealized Gain (Loss) on Open Commodity Contracts	1,169,390	[3]
% of Capital	0.21%	[3]
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Zinc Futures LX April 2014 contracts, expiring April 2014 [Member]	'
Number of Contracts	790	[3]
Unrealized Gain (Loss) on Open Commodity Contracts	-751,779	[3]
% of Capital	-0.13%	[3]
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Lead Futures LL June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	662	[3]
Unrealized Gain (Loss) on Open Commodity Contracts	589,820	[3]
% of Capital	0.10%	[3]
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Tin Futures LT July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	345	[3]
Unrealized Gain (Loss) on Open Commodity Contracts	98,734	[3]
% of Capital	0.02%	[3]
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Zinc Futures LX September 2014 contracts, expiring September 2014 [Member]	'
Number of Contracts	750	[3]
Unrealized Gain (Loss) on Open Commodity Contracts	1,162,671	[3]
% of Capital	0.20%	[3]
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Market Value	309,955,163
% of Capital	54.25%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Principal Amount	20,000,000
Market Value	19,999,489
% of Capital	3.50%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 4/24/2014 [Member]	'
Principal Amount	20,000,000
Market Value	19,998,923
% of Capital	3.50%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills0.09%, 4/24/2014 [Member]	'
Principal Amount	50,000,000
Market Value	49,997,308
% of Capital	8.75%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills0.08%, 5/01/2014 [Member]	'
Principal Amount	20,000,000
Market Value	19,998,750
% of Capital	3.50%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/08/2014 [Member]	'
Principal Amount	30,000,000
Market Value	29,997,533
% of Capital	5.25%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 5/15/2014 [Member]	'
Principal Amount	30,000,000
Market Value	29,996,700
% of Capital	5.25%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.10%, 6/05/2014 [Member]	'
Principal Amount	30,000,000
Market Value	29,994,854
% of Capital	5.25%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 6/26/2014 [Member]	'
Principal Amount	20,000,000
Market Value	19,996,417
% of Capital	3.50%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 7/17/2014 ]Member]	'
Principal Amount	20,000,000
Market Value	19,996,433
% of Capital	3.50%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Principal Amount	30,000,000
Market Value	29,992,604
% of Capital	5.25%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 8/28/2014 [Member]	'
Principal Amount	10,000,000
Market Value	9,997,103
% of Capital	1.75%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/11/2014 [Member]	'
Principal Amount	10,000,000
Market Value	9,996,604
% of Capital	1.75%
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/18/2014 [Member]	'
Principal Amount	20,000,000
Market Value	19,992,445
% of Capital	3.50%
United States Copper Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member]	'
Number of Contracts	40	[4]
Unrealized Gain (Loss) on Open Commodity Contracts	-95,737	[4]
% of Capital	-3.12%	[4]
United States Copper Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG May 2014 Contracts, expiring May 2014 [Member]	'
Number of Contracts	20
Unrealized Gain (Loss) on Open Commodity Contracts	-52,225
% of Capital	-1.70%
United States Copper Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	20
Unrealized Gain (Loss) on Open Commodity Contracts	-43,512
% of Capital	-1.42%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Market Value	1,329,814
% of Capital	43.40%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Principal Amount	200,000
Market Value	199,995
% of Capital	6.53%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 4/24/2014 [Member]	'
Principal Amount	200,000
Market Value	199,991
% of Capital	6.53%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/01/2014 [Member]	'
Principal Amount	200,000
Market Value	199,987
% of Capital	6.53%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/08/2014 [Member]	'
Principal Amount	200,000
Market Value	199,984
% of Capital	6.53%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 5/15/2014 [Member]	'
Principal Amount	200,000
Market Value	199,978
% of Capital	6.52%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Principal Amount	30,000
Market Value	29,992
% of Capital	0.98%
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/18/2014 [Member]	'
Principal Amount	300,000
Market Value	299,887
% of Capital	9.78%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member]	'
Number of Contracts	29
Unrealized Gain (Loss) on Open Commodity Contracts	82,333
% of Capital	3.14%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-Canola Futures RS July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	3
Unrealized Gain (Loss) on Open Commodity Contracts	882
% of Capital	0.03%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cocoa Futures CC July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	7
Unrealized Gain (Loss) on Open Commodity Contracts	17,750
% of Capital	0.68%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Coffee-C Futures KC July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	3
Unrealized Gain (Loss) on Open Commodity Contracts	48,244
% of Capital	1.84%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cotton #2 Futures CT July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	5
Unrealized Gain (Loss) on Open Commodity Contracts	15,255
% of Capital	0.58%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Sugar #11 Futures SB October 2014 contracts, expiring September 2014 [Member]	'
Number of Contracts	11
Unrealized Gain (Loss) on Open Commodity Contracts	202
% of Capital	0.01%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member]	'
Number of Contracts	41
Unrealized Gain (Loss) on Open Commodity Contracts	63,157
% of Capital	2.41%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| KCBOT Hard Red Winter Wheat Futures KW May 2014 contracts, expiring May 2014 [Member]	'
Number of Contracts	1
Unrealized Gain (Loss) on Open Commodity Contracts	4,562
% of Capital	0.17%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Live Cattle Futures LC June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	6
Unrealized Gain (Loss) on Open Commodity Contracts	10,890
% of Capital	0.41%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Wheat Futures W July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	4
Unrealized Gain (Loss) on Open Commodity Contracts	26,275
% of Capital	1.00%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Feeder Cattle Futures FC August 2014 contracts, expiring August 2014 [Member]	'
Number of Contracts	1
Unrealized Gain (Loss) on Open Commodity Contracts	-788
% of Capital	-0.03%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Lean Hogs Futures LH August 2014 contracts, expiring August 2014 [Member]	'
Number of Contracts	4
Unrealized Gain (Loss) on Open Commodity Contracts	-2,170
% of Capital	-0.08%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Meal Futures SM October 2014 contracts, expiring October 2014 [Member]	'
Number of Contracts	5
Unrealized Gain (Loss) on Open Commodity Contracts	-630
% of Capital	-0.02%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Oil Futures BO October 2014 contracts, expiring October 2014 [Member]	'
Number of Contracts	1
Unrealized Gain (Loss) on Open Commodity Contracts	1,080
% of Capital	0.04%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Futures S November 2014 contracts, expiring November 2014 [Member]	'
Number of Contracts	7
Unrealized Gain (Loss) on Open Commodity Contracts	8,050
% of Capital	0.31%
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Corn Futures C December 2014 contracts, expiring December 2014 [Member]	'
Number of Contracts	12
Unrealized Gain (Loss) on Open Commodity Contracts	15,888
% of Capital	0.61%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Market Value	1,469,793
% of Capital	56.03%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills0.08%, 5/01/2014 [Member]	'
Principal Amount	200,000
Market Value	199,987
% of Capital	7.62%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/08/2014 [Member]	'
Principal Amount	200,000
Market Value	199,983
% of Capital	7.62%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 5/15/2014 [Member]	'
Principal Amount	300,000
Market Value	299,967
% of Capital	11.44%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Principal Amount	200,000
Market Value	199,995
% of Capital	7.63%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 4/24/2014 [Member]	'
Principal Amount	200,000
Market Value	199,991
% of Capital	7.62%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Principal Amount	70,000
Market Value	69,983
% of Capital	2.67%
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/18/2014 [Member]	'
Principal Amount	300,000
Market Value	299,887
% of Capital	11.43%
United States Metals Index Fund [Member]	'
Number of Contracts	53	[5]
Unrealized Gain (Loss) on Open Commodity Contracts	-23,776	[5]
% of Capital	-1.09%	[5]
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member]	'
Number of Contracts	29
Unrealized Gain (Loss) on Open Commodity Contracts	-44,213
% of Capital	-2.03%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Number of Contracts	9
Unrealized Gain (Loss) on Open Commodity Contracts	-32,387
% of Capital	-1.49%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	7
Unrealized Gain (Loss) on Open Commodity Contracts	-17,294
% of Capital	-0.79%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Tin Futures LT July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	1
Unrealized Gain (Loss) on Open Commodity Contracts	-3,745
% of Capital	-0.17%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Nickel Futures LN October 2014 contracts, expiring October 2014 [Member]	'
Number of Contracts	2
Unrealized Gain (Loss) on Open Commodity Contracts	16,782
% of Capital	0.77%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL November 2014 contracts, expiring November 2014 [Member]	'
Number of Contracts	3
Unrealized Gain (Loss) on Open Commodity Contracts	125
% of Capital	0.00%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Aluminum Futures LA January 2015 contracts, expiring January 2015 [Member]	'
Number of Contracts	7
Unrealized Gain (Loss) on Open Commodity Contracts	-7,694
% of Capital	-0.35%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member]	'
Number of Contracts	13
Unrealized Gain (Loss) on Open Commodity Contracts	2,108
% of Capital	0.10%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Gold Futures GC June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	2
Unrealized Gain (Loss) on Open Commodity Contracts	-10,710
% of Capital	-0.49%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX Palladium Futures PA June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	2
Unrealized Gain (Loss) on Open Commodity Contracts	10,430
% of Capital	0.48%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	6
Unrealized Gain (Loss) on Open Commodity Contracts	2,363
% of Capital	0.11%
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Silver Futures SI July 2014 contracts, expiring July 2014 [Member]	'
Number of Contracts	3
Unrealized Gain (Loss) on Open Commodity Contracts	25
% of Capital	0.00%
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member]	'
Number of Contracts	11	[6]
Unrealized Gain (Loss) on Open Commodity Contracts	18,329	[6]
% of Capital	0.84%	[6]
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Number of Contracts	9	[6]
Unrealized Gain (Loss) on Open Commodity Contracts	16,119	[6]
% of Capital	0.73%	[6]
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Zinc Futures LX June 2014 contracts, expiring June 2014 [Member]	'
Number of Contracts	1	[6]
Unrealized Gain (Loss) on Open Commodity Contracts	2,080	[6]
% of Capital	0.10%	[6]
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Aluminum Futures LA January 2015 contracts, expiring January 2015 [Member]	'
Number of Contracts	1	[6]
Unrealized Gain (Loss) on Open Commodity Contracts	130	[6]
% of Capital	0.01%	[6]
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Market Value	1,099,879
% of Capital	50.37%
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Principal Amount	200,000
Market Value	199,995
% of Capital	9.16%
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 4/24/2014 [Member]	'
Principal Amount	100,000
Market Value	99,994
% of Capital	4.58%
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 4/24/2014 [Member]	'
Principal Amount	500,000
Market Value	499,973
% of Capital	22.90%
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Principal Amount	100,000
Market Value	99,975
% of Capital	4.58%
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 8/28/2014 [Member]	'
Principal Amount	200,000
Market Value	$199,942
% of Capital	9.15%

[1]	Collateral amounted to $207,895 on open futures contracts.
[2]	Collateral amounted to $43,088,258 on open futures contracts.
[3]	All short contracts are offset by the same number of Futures Contracts in the corresponding long positions and are acquired solely for the purpose of reducing a long position (e.g., due to a redemption or to reflect a rebalancing of the SDCI).
[4]	Collateral amounted to $390,269 on open futures contracts.
[5]	Collateral amounted to $314,592 on open futures contracts.
[6]	All short contracts are offset by the same number of Futures Contracts in the corresponding long positions and are acquired solely for the purpose of reducing a long position (e.g., due to a redemption or to reflect a rebalancing of the SDMI).

Condensed_Schedule_of_Investme1

Condensed Schedule of Investments (Parenthetical) (USD $)	3 Months Ended
Condensed Schedule of Investments (Parenthetical) (USD $)	Mar. 31, 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Expiration date	'April 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX April 2014 contracts, expiring April 2014	'
Expiration date	'April 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL June 2014 contracts, expiring June 2014	'
Expiration date	'June 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cocoa Futures CC July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cotton #2 Futures CT July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Tin Futures LT July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX August 2014 contracts, expiring August 2014 [Member]	'
Expiration date	'August 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX September 2014 contracts, expiring September 2014 [Member]	'
Expiration date	'September 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE Brent Crude Oil Futures CO December 2014 contracts, expiring November 2014 [Member]	'
Expiration date	'November 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Coffee-C Futures KC December 2014 contracts, expiring December 2014 [Member]	'
Expiration date	'December 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Live Cattle Futures LC June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'June 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Meal Futures SM July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Lean Hogs Futures LH July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX Platinum Futures PL July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Feeder Cattle Futures FC August 2014 contracts, expiring August 2014 [Member]	'
Expiration date	'August 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Futures S November 2014 contracts, expiring November 2014 [Member]	'
Expiration date	'November 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX WTI Crude Oil Futures CL December 2014 contracts, expiring November 2014 [Member]	'
Expiration date	'November 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]	'
Expiration date	'December 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Expiration date	'April 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Zinc Futures LX April 2014 contracts, expiring April 2014 [Member]	'
Expiration date	'April 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Lead Futures LL June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'Jun-14
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Tin Futures LT July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Commodity Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Zinc Futures LX September 2014 contracts, expiring September 2014 [Member]	'
Expiration date	'September 2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Debt Instrument, Collateral Amount	43,088,258
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Interest rate	0.06%
Expiration date	'4/17/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 8/28/2014 [Member]	'
Interest rate	0.07%
Expiration date	'4/24/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills0.09%, 4/24/2014 [Member]	'
Interest rate	0.09%
Expiration date	'4/24/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/01/2014 [Member]	'
Interest rate	0.08%
Expiration date	'5/1/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/08/2014 [Member]	'
Interest rate	0.08%
Expiration date	'5/08/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 5/15/2014 [Member]	'
Interest rate	0.09%
Expiration date	'5/15/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.10%, 6/05/2014 [Member]	'
Interest rate	0.10%
Expiration date	'6/05/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 6/26/2014 [Member]	'
Interest rate	0.08%
Expiration date	'6/26/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 7/17/2014 ]Member]	'
Interest rate	0.06%
Expiration date	'7/17/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Interest rate	0.06%
Expiration date	'8/21/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 8/28/2014 [Member]	'
Interest rate	0.07%
Expiration date	'8/28/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/11/2014 [Member]	'
Interest rate	0.08%
Expiration date	'9/11/2014
United States Commodity Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/18/2014 [Member]	'
Interest rate	0.08%
Expiration date	'9/18/2014
United States Copper Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG May 2014 Contracts, expiring May 2014 [Member]	'
Expiration date	'May 2014
United States Copper Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Debt Instrument, Collateral Amount	390,269
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Interest rate	0.06%
Expiration date	'8/21/2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Interest rate	0.06%
Expiration date	'4/17/2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 4/24/2014 [Member]	'
Interest rate	0.07%
Expiration date	'4/24/2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/01/2014 [Member]	'
Interest rate	0.08%
Expiration date	'5/1/2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/08/2014 [Member]	'
Interest rate	0.08%
Expiration date	'5/8/2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 5/15/2014 [Member]	'
Interest rate	0.09%
Expiration date	'5/15/2014
United States Copper Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/18/2014 [Member]	'
Interest rate	0.08%
Expiration date	'9/18/2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-Canola Futures RS July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cocoa Futures CC July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Coffee-C Futures KC July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Cotton #2 Futures CT July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| ICE-US Sugar #11 Futures SB October 2014 contracts, expiring September 2014 [Member]	'
Expiration date	'September 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| KCBOT Hard Red Winter Wheat Futures KW May 2014 contracts, expiring May 2014 [Member]	'
Expiration date	'May 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Live Cattle Futures LC June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'June 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Wheat Futures W July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Feeder Cattle Futures FC August 2014 contracts, expiring August 2014 [Member]	'
Expiration date	'August 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CME Lean Hogs Futures LH August 2014 contracts, expiring August 2014 [Member]	'
Expiration date	'August 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Meal Futures SM October 2014 contracts, expiring October 2014	'
Expiration date	'October 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Oil Futures BO October 2014 contracts, expiring October 2014 [Member]	'
Expiration date	'October 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Soybean Futures S November 2014 contracts, expiring November 2014 [Member]	'
Expiration date	'November 2014
United States Agriculture Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| CBOT Corn Futures C December 2014 contracts, expiring December 2014	'
Expiration date	'December 2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Debt Instrument, Collateral Amount	207,895
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Interest rate	0.06%
Expiration date	'8/21/2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 9/18/2014 [Member]	'
Interest rate	0.08%
Expiration date	'9/18/2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06, 4/17/2014 [Member]	'
Interest rate	0.06%
Expiration date	'4/17/2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07, 4/24/2014 [Member]	'
Interest rate	0.07%
Expiration date	'4/24/2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/01/2014 [Member]	'
Interest rate	0.08%
Expiration date	'5/1/2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.08%, 5/08/2014 [Member]	'
Interest rate	0.08%
Expiration date	'5/8/2014
United States Agriculture Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.09%, 5/15/2014 [Member]	'
Interest rate	0.09%
Expiration date	'5/15/2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Expiration date	'April 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Tin Futures LT July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Nickel Futures LN October 2014 contracts, expiring October 2014 [Member]	'
Expiration date	'October 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Lead Futures LL November 2014 contracts, expiring November 2014 [Member]	'
Expiration date	'November 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Aluminum Futures LA January 2015 contracts, expiring January 2015 [Member]	'
Expiration date	'January 2015
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| Foreign [Member] \| LME Zinc Futures LX June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'June 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Copper Futures HG July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Silver Futures SI July 2014 contracts, expiring July 2014 [Member]	'
Expiration date	'July 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| COMEX Gold Futures GC June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'June 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Long [Member] \| United States Contracts [Member] \| NYMEX Palladium Futures PA June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'June 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Aluminum Futures LA January 2015 contracts, expiring January 2015 [Member]	'
Expiration date	'January 2015
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Lead Futures LL April 2014 contracts, expiring April 2014 [Member]	'
Expiration date	'April 2014
United States Metals Index Fund [Member] \| Open Futures Contracts, Short [Member] \| Foreign [Member] \| LME Zinc Futures LX June 2014 contracts, expiring June 2014 [Member]	'
Expiration date	'June 2014
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member]	'
Debt Instrument, Collateral Amount	314,592
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills0.09%, 4/24/2014 [Member]	'
Interest rate	0.09%
Expiration date	'4/24/2014
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 8/21/2014 [Member]	'
Interest rate	0.06%
Expiration date	'8/21/2014
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 8/28/2014 [Member]	'
Interest rate	0.07%
Expiration date	'8/28/2014
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.06%, 4/17/2014 [Member]	'
Interest rate	0.06%
Expiration date	'4/17/2014
United States Metals Index Fund [Member] \| Cash Equivalents [Member] \| US Treasury Securities [Member] \| U.S.Treasury Bills 0.07%, 4/24/2014 [Member]	'
Interest rate	0.07%
Expiration date	'4/24/2014

Condensed_Statements_of_Operat

Condensed Statements of Operations (Unaudited) (USD $)	3 Months Ended
Condensed Statements of Operations (Unaudited) (USD $)	Mar. 31, 2014	Mar. 31, 2013
Gain (loss) on trading of commodity futures contracts:	'	'
Realized gain (loss) on closed positions	$27,005,397	$2,939,726
Change in unrealized loss on open positions	-1,495,984	-15,404,001
Realized gain (loss) on foreign currency transactions	-118	1
Change in unrealized gain (loss) on foreign currency translations	-3	463
Interest income	71,524	83,160
Other income	3,500	4,900
Total income (loss)	25,584,316	-12,375,751
Expenses	'	'
Management fees (Note 4)	1,272,305	1,211,639
Professional fees	154,260	163,777
Brokerage commissions	102,209	93,475
Other expenses	31,130	21,629
Total expenses	1,559,904	1,490,520
Expense waiver (Note 4)	-23,362	-83,562
Net expenses	1,536,542	1,406,958
Net income (loss)	24,047,774	-13,782,709
United States Commodity Index Fund [Member]	'	'
Gain (loss) on trading of commodity futures contracts:	'	'
Realized gain (loss) on closed positions	26,871,173	3,087,724
Change in unrealized loss on open positions	-1,482,624	-15,109,247
Realized gain (loss) on foreign currency transactions	4	0
Change in unrealized gain (loss) on foreign currency translations	-3	654
Interest income	70,654	81,796
Other income	3,150	4,900
Total income (loss)	25,462,354	-11,934,173
Expenses	'	'
Management fees (Note 4)	1,260,019	1,198,134
Professional fees	128,340	77,393
Brokerage commissions	101,246	92,612
Other expenses	30,717	21,348
Total expenses	1,520,322	1,389,487
Expense waiver (Note 4)	0	0
Net expenses	1,520,322	1,389,487
Net income (loss)	23,942,032	-13,323,660
Net income (loss) per share	$2.54	($1.45)
Net income (loss) per weighted average share	$2.54	($1.52)
Weighted average shares outstanding	9,419,444	8,745,556
United States Copper Index Fund [Member]	'	'
Gain (loss) on trading of commodity futures contracts:	'	'
Realized gain (loss) on closed positions	5,663	32,050
Change in unrealized loss on open positions	-225,900	-201,738
Interest income	306	451
Other income	350	0
Total income (loss)	-219,581	-169,237
Expenses	'	'
Management fees (Note 4)	3,692	4,038
Professional fees	15,120	24,824
Brokerage commissions	368	46
Other expenses	136	112
Total expenses	19,316	29,020
Expense waiver (Note 4)	-14,268	-23,895
Net expenses	5,048	5,125
Net income (loss)	-224,629	-174,362
Net income (loss) per share	($2.49)	($1.74)
Net income (loss) per weighted average share	($2.09)	($1.74)
Weighted average shares outstanding	107,222	100,000
United States Agriculture Index Fund [Member]	'	'
Gain (loss) on trading of commodity futures contracts:	'	'
Realized gain (loss) on closed positions	160,134	-160,486
Change in unrealized loss on open positions	190,023	11,844
Realized gain (loss) on foreign currency transactions	-122	1
Change in unrealized gain (loss) on foreign currency translations	0	-197
Interest income	308	467
Total income (loss)	350,343	-148,371
Expenses	'	'
Management fees (Note 4)	4,781	4,904
Professional fees	5,400	30,780
Brokerage commissions	401	571
Other expenses	141	82
Total expenses	10,723	36,337
Expense waiver (Note 4)	-4,511	-29,863
Net expenses	6,212	6,474
Net income (loss)	344,131	-154,845
Net income (loss) per share	$3.44	($1.55)
Net income (loss) per weighted average share	$3.44	($1.55)
Weighted average shares outstanding	100,000	100,000
United States Metals Index Fund [Member]	'	'
Gain (loss) on trading of commodity futures contracts:	'	'
Realized gain (loss) on closed positions	-31,573	-19,562
Change in unrealized loss on open positions	22,517	-104,860
Change in unrealized gain (loss) on foreign currency translations	0	6
Interest income	256	446
Total income (loss)	-8,800	-123,970
Expenses	'	'
Management fees (Note 4)	3,813	4,563
Professional fees	5,400	30,780
Brokerage commissions	194	246
Other expenses	136	87
Total expenses	9,543	35,676
Expense waiver (Note 4)	-4,583	-29,804
Net expenses	4,960	5,872
Net income (loss)	($13,760)	($129,842)
Net income (loss) per share	($0.14)	($1.30)
Net income (loss) per weighted average share	($0.14)	($1.30)
Weighted average shares outstanding	100,000	100,000

Condensed_Statements_of_Change

Condensed Statements of Changes in Capital (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014	Mar. 31, 2014
	United States Commodity Index Fund [Member]	United States Copper Index Fund [Member]	United States Agriculture Index Fund [Member]	United States Metals Index Fund [Member]	United States Commodity Index Funds Trust [Member]	Sponsor [Member]	Sponsor [Member]	Sponsor [Member]	Sponsor [Member]	Sponsor [Member]	Shareholders [Member]	Shareholders [Member]	Shareholders [Member]	Shareholders [Member]	Shareholders [Member]
						United States Commodity Index Fund [Member]	United States Copper Index Fund [Member]	United States Agriculture Index Fund [Member]	United States Metals Index Fund [Member]	United States Commodity Index Funds Trust [Member]	United States Commodity Index Fund [Member]	United States Copper Index Fund [Member]	United States Agriculture Index Fund [Member]	United States Metals Index Fund [Member]	United States Commodity Index Funds Trust [Member]
Balances	$512,945,022	$2,292,199	$2,278,939	$2,197,222	$519,713,382	$0	$0	$0	$0	$0	$512,945,022	$2,292,199	$2,278,939	$2,197,222	$519,713,382
Additions	34,438,290	997,004	0	0	35,435,294	0	0	0	0	0	34,438,290	997,004	0	0	35,435,294
Redemptions	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Net income (loss)	23,942,032	-224,629	344,131	-13,760	24,047,774	0	0	0	0	0	23,942,032	-224,629	344,131	-13,760	24,047,774
Balances	$571,325,344	$3,064,574	$2,623,070	$2,183,462	$579,196,450	$0	$0	$0	$0	$0	$571,325,344	$3,064,574	$2,623,070	$2,183,462	$579,196,450
Shares Outstanding	9,150,000	100,000	100,000	100,000	9,450,000	0	0	0	0	0	9,150,000	100,000	100,000	100,000	9,450,000
Additions	600,000	50,000	0	0	650,000	0	0	0	0	0	600,000	50,000	0	0	650,000
Redemptions	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Shares Outstanding	9,750,000	150,000	100,000	100,000	10,100,000	0	0	0	0	0	9,750,000	150,000	100,000	100,000	10,100,000
Net Asset Value Per Unit [Abstract]	'	'	'	'	'	'	'	'	'	'	'	'	'	'	'
Net asset value, beginning of period	$56.06	$22.92	$22.79	$21.97	'	'	'	'	'	'	'	'	'	'	'
Net asset value, end of period	$58.60	$20.43	$26.23	$21.83	'	'	'	'	'	'	'	'	'	'	'

Condensed_Statements_of_Cash_F

Condensed Statements of Cash Flows (USD $)	3 Months Ended
Condensed Statements of Cash Flows (USD $)	Mar. 31, 2014	Mar. 31, 2013
Cash Flows from Operating Activities:	'	'
Net income (loss)	$24,047,774	($13,782,709)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
(Increase) decrease in commodity futures trading account - cash and cash equivalents	-22,998,822	-8,470,804
Unrealized (gain) loss on open futures contracts	1,495,984	15,404,001
(Increase) decrease in receivable from Sponsor	222,364	148,969
Increase in interest receivable	0	-812
Increase in other assets	-37,665	-37,889
Increase (decrease) in management fees payable	49,905	19,597
Decrease in professional fees payable	-371,624	-323,302
Increase in directorsb fees payable	2,694	1,950
Net cash provided by (used in) operating activities	2,410,610	-7,040,999
Cash Flows from Financing Activities:	'	'
Addition of shares	43,927,205	41,405,522
Redemption of shares	0	-5,906,282
Net cash provided by (used in) financing activities	43,927,205	35,499,240
Net Increase (Decrease) in Cash and Cash Equivalents	46,337,815	28,458,241
Cash and Cash Equivalents, beginning of period	480,181,509	437,046,560
Cash and Cash Equivalents, end of period	526,519,324	465,504,801
United States Commodity Index Fund [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net income (loss)	23,942,032	-13,323,660
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
(Increase) decrease in commodity futures trading account - cash and cash equivalents	-22,771,705	-8,614,596
Unrealized (gain) loss on open futures contracts	1,482,624	15,109,247
Increase in interest receivable	0	-787
Increase in other assets	-37,137	-37,322
Increase (decrease) in management fees payable	49,558	19,828
Decrease in professional fees payable	-141,334	-167,858
Increase in directorsb fees payable	2,667	1,936
Net cash provided by (used in) operating activities	2,526,705	-7,013,212
Cash Flows from Financing Activities:	'	'
Addition of shares	42,930,201	41,405,522
Redemption of shares	0	-5,906,282
Net cash provided by (used in) financing activities	42,930,201	35,499,240
Net Increase (Decrease) in Cash and Cash Equivalents	45,456,906	28,486,028
Cash and Cash Equivalents, beginning of period	474,123,523	430,800,077
Cash and Cash Equivalents, end of period	519,580,429	459,286,105
United States Copper Index Fund [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net income (loss)	-224,629	-174,362
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
(Increase) decrease in commodity futures trading account - cash and cash equivalents	-264,309	-62,085
Unrealized (gain) loss on open futures contracts	225,900	201,738
(Increase) decrease in receivable from Sponsor	67,521	72,469
Increase in interest receivable	0	-7
Increase in other assets	-168	-167
Increase (decrease) in management fees payable	136	-54
Decrease in professional fees payable	-70,108	-75,369
Increase in directorsb fees payable	10	6
Net cash provided by (used in) operating activities	-265,647	-37,831
Cash Flows from Financing Activities:	'	'
Addition of shares	997,004	0
Redemption of shares	0	0
Net cash provided by (used in) financing activities	997,004	0
Net Increase (Decrease) in Cash and Cash Equivalents	731,357	-37,831
Cash and Cash Equivalents, beginning of period	2,040,735	2,109,061
Cash and Cash Equivalents, end of period	2,772,092	2,071,230
United States Agriculture Index Fund [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net income (loss)	344,131	-154,845
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
(Increase) decrease in commodity futures trading account - cash and cash equivalents	22,186	186,167
Unrealized (gain) loss on open futures contracts	-190,023	-11,844
(Increase) decrease in receivable from Sponsor	77,261	46,988
Increase in interest receivable	0	-14
Increase in other assets	-175	-195
Increase (decrease) in management fees payable	195	-115
Decrease in professional fees payable	-79,950	-49,250
Increase in directorsb fees payable	10	2
Net cash provided by (used in) operating activities	173,635	16,894
Cash Flows from Financing Activities:	'	'
Addition of shares	0	0
Redemption of shares	0	0
Net cash provided by (used in) financing activities	0	0
Net Increase (Decrease) in Cash and Cash Equivalents	173,635	16,894
Cash and Cash Equivalents, beginning of period	2,098,545	2,000,438
Cash and Cash Equivalents, end of period	2,272,180	2,017,332
United States Metals Index Fund [Member]	'	'
Cash Flows from Operating Activities:	'	'
Net income (loss)	-13,760	-129,842
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'
(Increase) decrease in commodity futures trading account - cash and cash equivalents	15,006	19,710
Unrealized (gain) loss on open futures contracts	-22,517	104,860
(Increase) decrease in receivable from Sponsor	77,582	29,512
Increase in interest receivable	0	-4
Increase in other assets	-185	-205
Increase (decrease) in management fees payable	16	-62
Decrease in professional fees payable	-80,232	-30,825
Increase in directorsb fees payable	7	6
Net cash provided by (used in) operating activities	-24,083	-6,850
Cash Flows from Financing Activities:	'	'
Addition of shares	0	0
Redemption of shares	0	0
Net cash provided by (used in) financing activities	0	0
Net Increase (Decrease) in Cash and Cash Equivalents	-24,083	-6,850
Cash and Cash Equivalents, beginning of period	1,918,706	2,136,984
Cash and Cash Equivalents, end of period	$1,894,623	$2,130,134

Organization_And_Business

Organization And Business	3 Months Ended
Organization And Business	Mar. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization And Business	'
	NOTE 1 - ORGANIZATION AND BUSINESS

	The United States Commodity Index Funds Trust (the “Trust”) was organized as a Delaware statutory trust on December 21, 2009. The Trust is a series trust formed pursuant to the Delaware Statutory Trust Act and includes the United States Commodity Index Fund (“USCI”), a commodity pool formed on April 1, 2010 and first made available to the public on August 10, 2010, the United States Copper Index Fund (“CPER”), a commodity pool formed on November 26, 2010 and first made available to the public on November 15, 2011, the United States Agriculture Index Fund (“USAG”), a commodity pool formed on November 26, 2010 and first made available to the public on April 13, 2012 and the United States Metals Index Fund (“USMI”), a commodity pool formed on November 26, 2010 and first made available to the public on June 19, 2012. USCI, CPER, USAG and USMI each issues shares (“shares”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). USCI, CPER, USAG and USMI are collectively referred to herein as the “Trust Series.” The Trust and each Trust Series operate pursuant to the Third Amended and Restated Declaration of Trust and Trust Agreement dated as of March 22, 2013 (the “Trust Agreement”). United States Commodity Funds LLC (“USCF”) is the sponsor of the Trust and the Trust Series and is also responsible for the management of the Trust and the Trust Series. For purposes of the financial statement presentation, unless specified otherwise, all references will be to the Trust Series.

	USCF has the power and authority to establish and designate one or more series and to issue shares thereof, from time to time as it deems necessary or desirable. USCF has exclusive power to fix and determine the relative rights and preferences as between the shares of any series as to right of redemption, special and relative rights as to dividends and other distributions and on liquidation, conversion rights, and conditions under which the series shall have separate voting rights or no voting rights. The term for which the Trust is to exist commenced on the date of the filing of the Certificate of Trust, and the Trust and any Trust Series will exist in perpetuity, unless earlier terminated in accordance with the provisions of the Trust Agreement. Separate and distinct records must be maintained for each Trust Series and the assets associated with a Trust Series must be held in such separate and distinct records (directly or indirectly, including a nominee or otherwise) and accounted for in such separate and distinct records separately from the assets of any other Trust Series. Each Trust Series is separate from all other Trust Series created as series of the Trust in respect of the assets and liabilities allocated to that Trust Series and represents a separate investment portfolio of the Trust.

	The sole Trustee of the Trust is Wilmington Trust Company (the “Trustee”), a Delaware banking corporation. The Trustee is unaffiliated with USCF. The Trustee’s duties and liabilities with respect to the offering of shares and the management of the Trust are limited to its express obligations under the Trust Agreement.

	USCF is a member of the National Futures Association (the “NFA”) and became a commodity pool operator (“CPO”) registered with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005 and a swaps firm on August 8, 2013. The Trust and each Trust Series have a fiscal year ending on December 31.

	USCF is also the general partner of the United States Oil Fund, LP (“USO”), the United States Natural Gas Fund, LP (“UNG”), the United States 12 Month Oil Fund, LP (“USL”), the United States Gasoline Fund, LP (“UGA”) and the United States Diesel-Heating Oil Fund, LP (“UHN”), which listed their limited partnership shares on the American Stock Exchange (the “AMEX”) under the ticker symbols “USO” on April 10, 2006, “UNG” on April 18, 2007, “USL” on December 6, 2007, “UGA” on February 26, 2008 and “UHN” on April 9, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USO’s, UNG’s, USL’s, UGA’s and UHN’s shares commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States Short Oil Fund, LP (“DNO”), the United States 12 Month Natural Gas Fund, LP (“UNL”) and the United States Brent Oil Fund, LP (“BNO”), which listed their limited partnership shares on the NYSE Arca under the ticker symbols “DNO” on September 24, 2009, “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. All funds listed previously are referred to collectively herein as the “Related Public Funds.”

	Effective as of May 1, 2012, each of USCI, CPER and USAG issue shares to certain authorized purchasers (“Authorized Purchasers”) by offering baskets consisting of 50,000 shares (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). Prior to May 1, 2012, each of USCI, CPER and USAG issued shares to Authorized Purchasers by offering baskets consisting of 100,000 shares through the Marketing Agent. USMI was not available to the public until June 19, 2012, and from its inception of offering, issues shares to certain Authorized Purchasers by offering baskets consisting of 50,000 shares through the Marketing Agent. The purchase price for a Creation Basket is based upon the net asset value (“NAV”) of a share calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received.

	Authorized Purchasers pay USCI $350 for each order placed to create one or more Creation Baskets or to redeem one or more baskets (“Redemption Baskets”), consisting of 50,000 shares. From May 1, 2012 through March 31, 2014 (and continuing at least through May 1, 2015), Authorized Purchasers pay each of CPER, USAG and USMI $350 for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets; prior to May 1, 2012, this fee was $1,000. Shares may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Shares purchased or sold on a nationally recognized securities exchange are not purchased or sold at the per share NAV of each Trust Series but rather at market prices quoted on such exchange.

	The accompanying unaudited condensed financial statements have been prepared in accordance with Rule 10-01 of Regulation S-X promulgated by the U.S. Securities and Exchange Commission (the “SEC”) and, therefore, do not include all information and footnote disclosure required under generally accepted accounting principles (“GAAP”) in the United States of America. The financial information included herein is unaudited; however, such financial information reflects all adjustments, consisting only of normal recurring adjustments, which are, in the opinion of USCF, necessary for the fair presentation of the condensed financial statements for the interim period.

Summary_Of_Significant_Account

Summary Of Significant Accounting Policies	3 Months Ended
Summary Of Significant Accounting Policies	Mar. 31, 2014
Accounting Policies [Abstract]	'
Summary Of Significant Accounting Policies	'
	NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

	Basis of Presentation

	The financial statements have been prepared in conformity with GAAP as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. Each Trust Series is an investment company and follows the accounting and reporting guidance in FASB Topic 946.

	Revenue Recognition

	Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statements of operations. Each Trust Series earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant at the 90-day Treasury bill rate. In addition, each Trust Series earns income on funds held at the custodian and/or futures commission merchant at prevailing market rates earned on such investments.

	Brokerage Commissions

	Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

	Income Taxes

	The Trust Series are not subject to federal income taxes; each investor reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

	In accordance with accounting principles generally accepted in the United States of America (“GAAP”), each Trust Series is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. Each Trust Series files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. None of the Trust Series is subject to income tax return examinations by major taxing authorities for years before 2010 (year of the Trust Series’ inception, but not necessarily the commencement of operations for each Trust Series). The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in each Trust Series recording a tax liability that reduces net assets. However, each Trust Series’ conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. Each Trust Series recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended March 31, 2014 for any Trust Series.

	Trust Capital and Allocation of Income and Losses

	Profit or loss shall be allocated among the shareholders of each Trust Series in proportion to the number of shares each investor holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the Trust Agreement.

	Creations and Redemptions

	Authorized Purchasers may purchase Creation Baskets or redeem Redemption Baskets for USCI, CPER, USAG and USMI only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

	Each Trust Series receives or pays the proceeds from shares sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Purchasers are reflected in each Trust Series’ condensed statements of financial condition as receivable for shares sold, and amounts payable to Authorized Purchasers upon redemption are reflected as payable for shares redeemed.

	Authorized Purchasers pay each Trust Series a fee of $350 for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets.

	Calculation of Net Asset Value Per Share

	Each Trust Series’ per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing the amount by the total number of shares outstanding. Each Trust Series uses the closing prices on the relevant Futures Exchanges (as defined in Note 3 below) of the Applicable Benchmark Component Futures Contracts (as defined in Note 3 below) that at any given time make up the Applicable Index (as defined in Note 3 below) (determined at the earlier of the close of such exchange or 2:30 p.m. New York time) for the contracts traded on the Futures Exchanges, but calculates or determines the value of all other investments of each Trust Series using market quotations, if available, or other information customarily used to determine the fair value of such investments.

	Net Income (Loss) Per Share

	Net income (loss) per share is the difference between the per share NAV at the beginning of each period and the per share NAV at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. As of March 31, 2014, USCF held 5 shares of USCI, 40 shares of CPER, 5 shares of USAG and 5 shares of USMI.

	Offering Costs

	Offering costs incurred in connection with the registration of shares prior to the commencement of the offering are borne by USCF. Offering costs incurred in connection with the registration of additional shares after the commencement of the offering are borne by each Trust Series. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. Costs borne by the Trust Series after the commencement of an offering are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

	Cash Equivalents

	Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.

	Use of Estimates

	The preparation of condensed financial statements in conformity with GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

Trust_Series

Trust Series	3 Months Ended
Trust Series	Mar. 31, 2014
Trust Series [Abstract]	'
Trust Series	'
	NOTE 3 - TRUST SERIES

	In connection with the execution of the First Trust Agreement on April 1, 2010, USCI was designated as the first series of the Trust. USCF contributed $1,000 to the Trust upon its formation on December 21, 2009, representing an initial contribution of capital to the Trust. Following the designation of USCI as the first series of the Trust, the initial capital contribution of $1,000 was transferred from the Trust to USCI and deemed an initial contribution to USCI. In connection with the commencement of USCI’s initial offering of shares, USCF received 20 Sponsor Shares of USCI in exchange for the previously received capital contribution, representing a beneficial ownership interest in USCI.

	On July 30, 2010, USCI received a notice of effectiveness from the SEC for its registration of 50,000,000 shares on Form S-1 with the SEC. On August 10, 2010, USCI listed its shares on the NYSE Arca under the ticker symbol “USCI”. USCI established its initial per share NAV by setting the price at $50.00 and issued 100,000 shares in exchange for $5,000,000 on August 10, 2010. USCI also commenced investment operations on August 10, 2010 by purchasing Futures Contracts traded on the Futures Exchanges. In order to satisfy NYSE Arca listing standards that at least 100,000 shares be outstanding at the beginning of the trading day on the NYSE Arca, USCF purchased the initial Creation Basket from the initial Authorized Purchaser at the initial offering price. The $1,000 fee that would otherwise be charged to the Authorized Purchaser in connection with an order to create or redeem was waived in connection with the initial Creation Basket. USCF held such initial Creation Basket until September 3, 2010, at which time the initial Authorized Purchaser repurchased the shares comprising such basket in accordance with the specified conditions noted above. On September 14, 2011, USCF redeemed the 20 Sponsor Shares of USCI and, on September 19, 2011, USCF purchased five shares of USCI in the open market.

	In connection with the Second Amended and Restated Trust Agreement dated November 10, 2010, USMI, USAG and CPER were designated as three additional series of the Trust. Following the designation of the additional series, an initial capital contribution of $3,000 was transferred from USCF to the Trust. On November 10, 2010, the Trust transferred $1,000 to each of USMI, USAG and CPER, which was deemed a capital contribution to each series. On November 14, 2011, USCF received 40 Sponsor Shares of CPER in exchange for the previously received capital contribution, representing a beneficial interest in CPER. On December 7, 2011, USCF redeemed the 40 Sponsor Shares of CPER and purchased 40 shares of CPER in the open market. On April 13, 2012, USCF received 40 Sponsor Shares of USAG in exchange for the previously received capital contribution, representing a beneficial interest in USAG. On June 28, 2012, USCF redeemed the 40 Sponsor Shares of USAG and on October 3, 2012, purchased 5 shares of USAG on the open market. On June 19, 2012, USCF received 40 Sponsor Shares of USMI in exchange for the previously received capital contribution, representing a beneficial interest in USMI. On August 27, 2012, USCF redeemed the 40 Sponsor Shares of USMI and, on September 4, 2013, purchased 5 shares of USMI on the open market.

	CPER, USAG and USMI received notice of effectiveness from the SEC for its registration of 30,000,000 CPER shares, 20,000,000 USAG shares and 20,000,000 USMI shares on September 6, 2011. The order to permit listing CPER, USAG and USMI on the NYSE Arca was received on October 20, 2011. On November 15, 2011, CPER listed its shares on the NYSE Arca under the ticker symbol “CPER.” CPER established its initial per share NAV by setting the price at $25.00 and issued 100,000 shares to the initial authorized purchaser in exchange for $2,500,000 in cash on November 15, 2011. The $1,000 fee that would otherwise have been charged to the Authorized Purchaser in connection with an order to create or redeem was waived in connection with the initial Creation Basket.

	On April 13, 2012, USAG listed its shares on the NYSE Arca under the ticker symbol “USAG.” USAG established its initial per share NAV by setting the price at $25.00. On April 14, 2012, USCF purchased two initial Creation Baskets of USAG. In accordance with applicable requirements of Regulation M under the Securities Exchange Act of 1934, no Creation Baskets were offered to Authorized Purchasers nor were the shares listed on the NYSE Arca until five business days had elapsed from the date of USCF’s purchase of the initial Creation Basket on April 4, 2012. The $1,000 fee that would have otherwise been charged in connection with an order to create or redeem was waived in connection with the initial Creation Basket.

	On June 19, 2012, USMI listed its shares on the NYSE Arca under the ticker symbol “USMI.” USMI established its initial per share NAV by setting the price at $25.00. On June 11, 2012, USCF purchased two initial Creation Baskets of USMI. In accordance with applicable requirements of Regulation M under the Securities Exchange Act of 1934, no Creation Baskets were offered to Authorized Purchasers nor were the shares listed on the NYSE Arca until five business days had elapsed from the date of USCF’s purchase of the initial Creation Basket on June 11, 2012. The $350 fee that would have otherwise been charged in connection with an order to create or redeem was waived in connection with the initial Creation Basket. On September 4, 2013, USCF redeemed the second of two initial Creation Baskets.

	USCI’s Investment Objective

	USCI invests in futures contracts for commodities that are currently traded on the New York Mercantile Exchange (the “NYMEX”), ICE Futures (“ICE Futures”), Chicago Board of Trade (“CBOT”), Chicago Mercantile Exchange (“CME”), London Metal Exchange (“LME”), Commodity Exchange, Inc. (“COMEX”) or on other foreign exchanges (the NYMEX, ICE Futures, CBOT, CME, LME, COMEX and other foreign exchanges, collectively, the “Futures Exchanges”) (such futures contracts, collectively, “Futures Contracts”) and, to a lesser extent, in order to comply with regulatory requirements or in view of market conditions, other commodity-based contracts and instruments such as cash-settled options on Futures Contracts, forward contracts relating to commodities, cleared swap contracts and other non exchange traded (“over-the-counter”) transactions that are based on the price of commodities and Futures Contracts (collectively, “Other Commodity-Related Investments”). Market conditions that USCF currently anticipates could cause USCI to invest in Other Commodity Related Investments would be those allowing USCI to obtain greater liquidity or to execute transactions with more favorable pricing. Futures Contracts and Other Commodity-Related Investments collectively are referred to as “Commodity Interests.”

	The investment objective of USCI is for the daily changes in percentage terms of its shares’ per share net asset value (“NAV”) to reflect the daily changes in percentage terms of the SummerHaven Dynamic Commodity Index Total Return^SM (the “SDCI”), less USCI’s expenses. USCF does not intend to operate USCI in a fashion such that its per share NAV will equal, in dollar terms, the spot prices of the commodities underlying the Benchmark Component Futures Contracts (as defined below) that comprise the SDCI or the prices of any particular group of Futures Contracts. USCI will not seek to achieve its stated investment objective over a period of time greater than one day. USCI believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Futures Contracts and Other Commodity-Related Investments. The SDCI is designed to reflect the performance of a diversified group of commodities. The SDCI is comprised of 14 Futures Contracts that are selected on a monthly basis from a list of 27 possible Futures Contracts. The Futures Contracts that at any given time make up the SDCI are referred to herein as “Benchmark Component Futures Contracts.” The SDCI is owned and maintained by SummerHaven Index Management, LLC (“SummerHaven Indexing”) and calculated and published by Bloomberg, L.P. USCI invests first in the current Benchmark Component Futures Contracts and other Futures Contracts intended to replicate the return on the current Benchmark Component Futures Contracts and, thereafter may hold Futures Contracts in a particular commodity other than one specified as a Benchmark Component Futures Contract, or may hold Other Commodity-Related Investments that are intended to replicate the return on the Benchmark Component Futures Contracts, but may fail to closely track the SDCI’s total return movements. If USCI increases in size, and due to its obligations to comply with regulatory limits or due to other market pricing or liquidity factors, USCI may invest in Futures Contract months other than the designated month specified as a Benchmark Component Futures Contract, or in Other Commodity-Related Investments, which may have the effect of increasing transaction related expenses and may result in increased tracking error.

	As of March 31, 2014, USCI held 1,870 Futures Contracts on the NYMEX, 3,231 Futures Contracts on the ICE Futures, 1,573 Futures Contracts on the CBOT, 2,007 Futures Contracts on the CME, 7,336 Futures Contracts on the LME and 547 Futures Contracts on the COMEX, totaling 16,564 futures contracts.

	CPER’s Investment Objective

	The investment objective of CPER is for the daily changes in percentage terms of its shares’ per share NAV to reflect the daily changes in percentage terms of the SummerHaven Copper Index Total Return^SM (the “SCITR”), less CPER’s expenses. USCF does not intend to operate CPER in a fashion such that its per share NAV will equal, in dollar terms, the spot prices of the commodities underlying the Benchmark Component Copper Futures Contracts (as defined below) that comprise the SCITR or the prices of any particular group of Futures Contracts. CPER will not seek to achieve a stated investment objective over a period of time greater than one day. USCF believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Futures Contracts and Other Copper-Related Investments (as defined below). The SCITR is designed to reflect the performance of the investment returns from a portfolio of copper futures contracts. The SCITR is owned and maintained by SummerHaven Indexing and calculated and published by the NYSE Arca. The SCITR is comprised of either two or three Eligible Copper Futures Contracts that are selected on a monthly basis based on quantitative formulas relating to the prices of the Eligible Copper Futures Contracts developed by SummerHaven Indexing. The Eligible Copper Futures Contracts that at any given time make up the SCITR are referred to herein as “Benchmark Component Copper Futures Contracts.”

	CPER seeks to achieve its investment objective by investing to the fullest extent possible in the Benchmark Component Copper Futures Contracts. Then, if constrained by regulatory requirements or in view of market conditions, CPER will invest next in other Eligible Copper Futures Contracts, and finally to a lesser extent, in other exchange traded futures contracts that are economically identical or substantially similar to the Benchmark Component Copper Futures Contracts if one or more other Eligible Copper Futures Contracts is not available. When CPER has invested to the fullest extent possible in exchange-traded futures contracts, CPER may then invest in other contracts and instruments based on the Benchmark Component Copper Futures Contracts, other Eligible Copper Futures Contracts or copper, such as cash-settled options, forward contracts, cleared swap contracts and swap contracts other than cleared swap contracts. Other exchange-traded futures contracts that are economically identical or substantially similar to the Benchmark Component Copper Futures Contracts and other contracts and instruments based on the Benchmark Component Copper Futures Contracts, are collectively referred to as “Other Copper-Related Investments,” and together with Benchmark Component Copper Futures Contracts and other Eligible Copper Futures Contracts, “Copper Interests.” As of March 31, 2014, CPER held 40 Futures Contracts on the COMEX.

	USAG’s Investment Objective

	The investment objective of USAG is for the daily changes in percentage terms of its shares’ per share NAV to reflect the daily changes in percentage terms of the SummerHaven Dynamic Agriculture Index Total Return^SM (the “SDAI”), less USAG’s expenses. USCF does not intend to operate USAG in a fashion such that its per share NAV will equal, in dollar terms, the spot prices of the commodities underlying the Benchmark Component Agriculture Futures Contracts (as defined below) that comprise the SDAI or the prices of any particular group of Futures Contracts. USAG will not seek to achieve its stated investment objective over a period of time greater than one day. USCF believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Futures Contracts and Other Agriculture-Related Investments (as defined below). The SDAI is designed to reflect the performance of a diversified group of agricultural commodities. The SDAI is owned and maintained by SummerHaven Indexing and calculated and published by the NYSE Arca. Futures contracts for the agricultural commodities comprising the SDAI are traded on ICE Future US, ICE Futures Canada, the CBOT, the Kansas City Board of Trade (“KCBT”) and the CME and are collectively referred to herein as “Eligible Agriculture Futures Contracts.” The SDAI is comprised of 14 Eligible Agriculture Futures Contracts that are selected on a monthly basis based on quantitative formulas developed by SummerHaven Indexing. The Eligible Agriculture Futures Contracts that at any given time make up the SDAI are referred to herein as “Benchmark Component Agriculture Futures Contracts.” The relative weighting of the Benchmark Component Agriculture Futures Contracts will change on a monthly basis, based on quantitative formulas relating to the prices of the Benchmark Component Agriculture Futures Contracts developed by SummerHaven Indexing.

	USAG seeks to achieve its investment objective by investing to the fullest extent possible in the Benchmark Component Agriculture Futures Contracts. Then, if constrained by regulatory requirements or in view of market conditions, USAG will invest next in other Eligible Agriculture Futures Contracts based on the same agricultural commodity as the futures contracts subject to such regulatory constraints or market conditions, and finally, to a lesser extent, in other exchange traded futures contracts that are economically identical or substantially similar to the Benchmark Component Agriculture Futures Contracts if one or more other Eligible Agriculture Futures Contracts is not available. When USAG has invested to the fullest extent possible in exchange-traded futures contracts, USAG may then invest in other contracts and instruments based on the Benchmark Component Agriculture Futures Contracts, other Eligible Agriculture Futures Contracts or the agricultural commodities included in the SDAI, such as cash-settled options, forward contracts, cleared swap contracts and swap contracts other than cleared swap contracts. Other exchange-traded futures contracts that are economically identical or substantially similar to the Benchmark Component Agriculture Futures Contracts and other contracts and instruments based on the Benchmark Component Agriculture Futures Contracts, as well as metals included in the SDAI, are collectively referred to as “Other Agriculture-Related Investments,” and together with Benchmark Component Agriculture Futures Contracts and other Eligible Agriculture Futures Contracts, “Agriculture Interests.” As of March 31, 2014, USAG held 29 Futures Contracts on the ICE Futures, 11 Futures Contracts on the CME, 1 Futures Contract on the KCBT and 29 Futures Contracts on the CBOT, totaling 70 futures contracts.

	USMI’s Investment Objective

	The investment objective of USMI is for the daily changes in percentage terms of its shares’ per share NAV to reflect the daily changes in percentage terms of the SummerHaven Metals Index Total Return^SM (the “SDMI”), less USMI’s expenses. USCF does not intend to operate USMI in a fashion such that its per share NAV will equal, in dollar terms, the spot prices of the commodities underlying the Benchmark Component Metals Futures Contracts (as defined below) that comprise the SDMI or the prices of any particular group of Futures Contracts. USMI will not seek to achieve its stated investment objective over a period of time greater than one day. USCF believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Futures Contracts and Other Metals-Related Investments (as defined below). The SDMI is owned and maintained by SummerHaven Indexing and calculated and published by the NYSE Arca. Futures contracts for the metals in the SDMI that are traded on the NYMEX, the LME and COMEX are collectively referred to herein as “Eligible Metals Futures Contracts.” The SDMI is comprised of 10 Eligible Metals Futures Contracts that are selected on a monthly basis based on quantitative formulas developed by SummerHaven Indexing. The Eligible Metals Futures Contracts that at any given time make up the SDMI are referred to herein as “Benchmark Component Metals Futures Contracts.” The relative weighting of the Benchmark Component Metals Futures Contracts will change on a monthly basis, based on quantitative formulas relating to the prices of the Benchmark Component Metals Futures Contracts developed by SummerHaven Indexing.

	USMI seeks to achieve its investment objective by investing to the fullest extent possible in the Benchmark Component Metals Futures Contracts. Then, if constrained by regulatory requirements or in view of market conditions, USMI will invest next in other Eligible Metals Futures Contracts, and finally to a lesser extent, in other exchange traded futures contracts that are economically identical or substantially similar to the Benchmark Component Metals Futures Contracts if one or more other Eligible Metals Futures Contracts is not available. When USMI has invested to the fullest extent possible in exchange-traded futures contracts, USMI may then invest in other contracts and instruments based on the Benchmark Component Metals Futures Contracts, other Eligible Metals Futures Contracts or the metals included in the SDMI, such as cash-settled options, forward contracts, cleared swap contracts and swap contracts other than cleared swap contracts. Other exchange-traded futures contracts that are economically identical or substantially similar to the Benchmark Component Metals Futures Contracts and other contracts and instruments based on the Benchmark Component Metals Futures Contracts are collectively referred to as “Other Metals-Related Investments,” and together with Benchmark Component Metals Futures Contracts and other Eligible Metals Futures Contracts, “Metals Interests.” As of March 31, 2014, USMI held 2 Futures Contracts on the NYMEX, 40 Futures Contracts on the LME and 11 Futures Contracts on the COMEX, totaling 53 futures contracts.

	Other Defined Terms – Trust Series

	The SDCI, the SCITR, the SDAI and the SDMI are referred to throughout these Notes to Financial Statements collectively as the “Applicable Index” or “Indices.”

	Benchmark Component Futures Contracts, Benchmark Component Copper Futures Contracts, Benchmark Component Agriculture Futures Contracts and Benchmark Component Metals Futures Contracts are referred to throughout these Notes to Condensed Financial Statements collectively as “Applicable Benchmark Component Futures Contracts.”

	Other Commodity-Related Investments, Other Copper-Related Investments, Other Agriculture-Related Interests and Other Metals-Related Investments are referred to throughout these Notes to Condensed Financial Statements collectively as “Other Related Investments.”

	Trading Advisor and Trustee

	The Trust Series’ trading advisor is SummerHaven Investment Management, LLC (“SummerHaven”), a Delaware limited liability company that is registered as a commodity trading advisor and CPO with the CFTC and is a member of the NFA. SummerHaven provides advisory services to USCF with respect to the Applicable Index of each Trust Series and the investment decisions of each Trust Series.

	The Trustee accepts service of legal process on the Trust in the State of Delaware and makes certain filings under the Delaware Statutory Trust Act. The Trustee does not owe any other duties to the Trust, USCF or the shareholders.

Fees_Paid_By_Each_Trust_Series

Fees Paid By Each Trust Series And Related Party Transactions	3 Months Ended
	Mar. 31, 2014
Fees Paid By Usci and Cper and Related Party Transactions [Abstract]	'
Fees Paid by Usci and Cper and Related Party Transactions	'
	NOTE 4 - FEES PAID BY EACH TRUST SERIES AND RELATED PARTY TRANSACTIONS

	USCF Management Fee

	Under the Trust Agreement, USCF is responsible for investing the assets of each Trust Series in accordance with the objectives and policies of each such Trust Series. In addition, USCF has arranged for one or more third parties to provide trading advisory, administrative, custody, accounting, transfer agency and other necessary services to each Trust Series. For these services, each of USCI, CPER, USAG and USMI is contractually obligated to pay USCF a fee, which is paid monthly, equal to a percentage per annum of average daily total net assets. Effective as of May 29, 2012 (and continuing at through April 30, 2014), USCF voluntarily waived the management fee paid by each of CPER and USAG from 0.95% per annum of average daily total net assets to 0.65% and 0.80% per annum of average daily total net assets, respectively. Effective as of May 30, 2012 (and continuing through April 30, 2014), USCF voluntarily waived the management fee paid by USMI from 0.95% per annum of average daily total net assets to 0.70% per annum of average daily total net assets.

	Effective May 1, 2014 and continuing through December 31, 2015, USCF has contractually agreed to lower the management fee to 0.80% per annum of average daily total net assets for USCI, 0.65% per annum of average daily total net assets for CPER, 0.65% per annum of average daily total net assets for USAG and 0.65% per annum of average daily total net assets for USMI.

	Trustee Fee

	The Trustee is the Delaware trustee of the Trust. In connection with the Trustee’s services, USCF is responsible for paying the Trustee’s annual fee in the amount of $3,000.

	Ongoing Registration Fees and Other Offering Expenses

	Each Trust Series pays the costs and expenses associated with the ongoing registration of its shares subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of shares, and all legal, accounting, printing and other expenses associated with such offer and sale. During the three months ended March 31, 2014 and 2013, none of the Trust Series incurred any registration fees or other offering expenses.

	Directors’ Fees and Expenses

	Each Trust Series is responsible for paying its portion of the directors’ and officers’ liability insurance for such Trust Series and the Related Public Funds. In addition, each Trust Series is responsible for paying the fees and expenses of the independent directors who also serve as audit committee members of the Trust Series and the Related Public Funds. Each Trust Series shares the fees and expenses on a pro rata basis with each other Trust Series and each Related Public Fund, as described above, based on the relative assets of each Related Public Fund computed on a daily basis. These fees and expenses for the year ending December 31, 2014 are estimated to be a total of $560,625 for the Trust Series and the Related Public Funds.

	Investor Tax Reporting Cost

	The fees and expenses associated with each Trust Series’ audit expenses and tax accounting and reporting requirements are paid by such Trust Series. These costs are estimated to be $350,000 for the year ending December 31, 2014 for USCI, $55,000 for the year ending December 31, 2014 for CPER, $55,000 for the year ending December 31, 2014 for USAG and $55,000 for the year ending December 31, 2014 for USMI.

	Other Expenses and Fees and Expense Waivers

	In addition to the fees described above, each Trust Series pays all brokerage fees and other expenses in connection with the operation of such Trust Series, excluding costs and expenses paid by USCF as outlined in Note 5 below. In addition, USCF has voluntarily agreed to pay certain expenses normally borne by each of CPER, USAG and USMI to the extent that such expenses exceed 0.15% (15 basis points) of each of CPER’s, USAG’s and USMI’s NAV, on an annualized basis, through at least June 30, 2014. USCF has no obligation to continue such payments into subsequent periods. For the three months ended March 31, 2014, USCF waived $14,268 in expenses for CPER, $4,511 for USAG and $4,583 for USMI. This voluntary expense waiver is in addition to those amounts USCF is contractually obligated to pay as described in Note 5.

Contracts_and_Agreements

Contracts and Agreements	3 Months Ended
Contracts and Agreements	Mar. 31, 2014
Contractors [Abstract]	'
Contracts and Agreements	'
	NOTE 5 - CONTRACTS AND AGREEMENTS

	USCF and the Trust, each on its own behalf and on behalf of each Trust Series, are party to a marketing agent agreement, dated as of July 22, 2010, as amended from time to time, with the Marketing Agent, whereby the Marketing Agent provides certain marketing services for each Trust Series as outlined in the agreement. The fee of the Marketing Agent, which is borne by USCF, is equal to 0.06% on each Trust Series’ assets up to $3 billion and 0.04% on each Trust Series’ assets in excess of $3 billion. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution related services exceed 10% of the gross proceeds of each Trust Series’ offering.

	The above fee does not include the following expenses, which are also borne by USCF: the cost of placing advertisements in various periodicals; website construction and development; or the printing and production of various marketing materials.

	USCF and the Trust, on its own behalf and on behalf of each Trust Series, are also party to a custodian agreement, dated July 22, 2010, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”), whereby BBH&Co. holds investments on behalf of each Trust Series. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, USCF and the Trust, on its own behalf and on behalf of each Trust Series, are party to an administrative agency agreement, dated July 22, 2010, as amended from time to time, with BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for each Trust Series. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time.

	Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to each Trust Series and each of the Related Public Funds, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of: (a) 0.06% for the first $500 million of the Related Public Funds’ combined net assets, (b) 0.0465% for the Related Public Funds’ combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once the Related Public Funds’ combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays transaction fees ranging from $7 to $15 per transaction.

	Each Trust Series has entered into a brokerage agreement, dated March 1, 2010 for USCI and November 18, 2011 for each of CPER, USAG and USMI, as amended from time to time, with Newedge USA, LLC (“Newedge”). The agreement requires Newedge to provide services to each Trust Series in connection with the purchase and sale of Futures Contracts and Other Related Investments that may be purchased and sold by or through Newedge for each Trust Series’ account. In accordance with the agreement, Newedge charges each Trust Series commissions of approximately $7 to $15 per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts. Such fees include those incurred when purchasing Futures Contracts and options on Futures Contracts when each Trust Series issues shares as a result of a Creation Basket, as well as fees incurred when selling Futures Contacts and options on Futures Contracts when each Trust Series redeems shares as a result of a Redemption Basket. Such fees are also incurred when Futures Contracts and options on Futures Contracts are purchased or redeemed for the purpose of rebalancing the portfolio. Each Trust Series also incurs commissions to brokers for the purchase and sale of Futures Contracts, Other Commodity-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).

	USCI

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	101,246		$	92,612
	Commissions accrued as a result of rebalancing	$	98,726		$	90,204
	Percentage of commissions accrued as a result of Rebalancing		97.51	%		97.4	%
	Commissions accrued as a result of creation and redemption activity	$	2,520		$	2,408
	Percentage of commissions accrued as a result of creation and redemption activity		2.49	%		2.6	%

	The increase in the total commissions accrued to brokers by USCI for the three months ended March 31, 2014 as compared to the three months ended March 31, 2013 was primarily due to an increase in the number of contracts traded during the rebalancing periods for the three months ended March 31, 2014. As an annualized percentage of average total net assets, USCI’s figure for the three months ended March 31, 2014 represents approximately 0.08% of USCI’s average total net assets. By comparison, USCI’s figure for the three months ended March 31, 2013 represented approximately 0.07% of USCI’s average total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

	CPER

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	368		$	46
	Commissions accrued as a result of rebalancing	$	292		$	46
	Percentage of commissions accrued as a result of Rebalancing		79.38	%		100	%
	Commissions accrued as a result of creation and redemption activity	$	76		$	-
	Percentage of commissions accrued as a result of creation and redemption activity		20.62	%		-	%

	The increase in CPER’s total commissions accrued to brokers for the three months ended March 31, 2014 as compared to the three months ended March 31, 2013, was primarily due to an increase in the number of contracts traded during the rebalancing periods for the three months ended March 31, 2014. As an annualized percentage of average total net assets, CPER’s figure for the three months ended March 31, 2014 represents approximately 0.06% of CPER’s average total net assets. By comparison, CPER’s figure for the three months ended March 31, 2013 represented approximately 0.00% of CPER’s average total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

	USAG

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	401		$	571
	Commissions accrued as a result of rebalancing	$	401		$	571
	Percentage of commissions accrued as a result of Rebalancing		100	%		100	%
	Commissions accrued as a result of creation and redemption activity	$	-		$	-
	Percentage of commissions accrued as a result of creation and redemption activity		-	%		-	%

	The decrease in USAG’s total commissions accrued to brokers for the three months ended March 31, 2014 as compared to the three months ended March 31, 2013, was primarily due to a decrease in the number of futures contracts traded during the three months ended March 31, 2014. As an annualized percentage of average daily total net assets, USAG’s figure for the three months ended March 31, 2014 represents approximately 0.07% of USAG’s average daily total net assets. By comparison, USAG’s figure for the three months ended March 31, 2013 represented approximately 0.10% of USAG’s average total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

	USMI

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	194		$	246
	Commissions accrued as a result of rebalancing	$	194		$	246
	Percentage of commissions accrued as a result of Rebalancing		100	%		100	%
	Commissions accrued as a result of creation and redemption activity	$	-		$	-
	Percentage of commissions accrued as a result of creation and redemption activity		-	%		-	%

	The decrease in USMI’s total commissions accrued to brokers for the three months ended March 31, 2014 as compared to the three months ended March 31, 2013, was primarily due to a decrease in the number of futures contracts traded during the three months ended March 31, 2014. As an annualized percentage of average daily total net assets, USMI’s figure for the three months ended March 31, 2014 represents approximately 0.04% of USMI’s average daily total net assets. By comparison, USMI’s figure for the three months ended March 31, 2013 represented approximately 0.04% of USMI’s average daily total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

	USCF is party to an Amended Advisory Agreement, dated July 1, 2011, as amended from time to time, with SummerHaven, whereby SummerHaven provides advisory services to USCF with respect to the Applicable Index for each Trust Series and investment decisions for each Trust Series. SummerHaven’s advisory services include, but are not limited to, general consultation regarding the calculation and maintenance of the Applicable Index for each Trust Series, anticipated changes to each Applicable Index and the nature of each Applicable Index’s current or anticipated component securities. For these services, USCF pays SummerHaven a fee based on a percentage of the average total net assets of each Trust Series. For USCI, the fee is equal to the percentage fees paid to USCF minus 0.14%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid. For each of CPER, USAG and USMI, the fee is equal to the percentage fees paid to USCF minus 0.18%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid.

	USCF is also party to an Amended Licensing Agreement, dated July 1, 2011, as amended from time to time, with SummerHaven, whereby SummerHaven sub-licensed to each Trust Series the use of certain names and marks, including the Applicable Index for each Trust Series for which SummerHaven has a sub-license from SummerHaven Indexing, the owner of each Applicable Index. Under the Licensing Agreement, USCF paid SummerHaven an annual fee of $15,000 per each Trust Series for the year ended December 31, 2013, plus an annual fee of 0.06% of the average daily total net assets of each Trust Series.

Financial_Instruments_Offbalan

Financial Instruments, Off-balance Sheet Risks and Contingencies	3 Months Ended
	Mar. 31, 2014
Risks and Uncertainties [Abstract]	'
Financial Instruments, Off-balance Sheet Risks and Contingencies	'
	NOTE 6 - FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES

	Each Trust Series engages in the trading of futures contracts and may engage in trading options on futures contracts and cleared swaps (collectively, “derivatives”). As such, each Trust Series is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract.

	Each Trust Series may enter into futures contracts and options on futures contracts to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery.

	The purchase and sale of futures contracts and options on futures contracts require margin deposits with a futures commission merchant. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires a futures commission merchant to segregate all customer transactions and assets from the futures commission merchant’s proprietary activities.

	Futures contracts, options on futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure each Trust Series has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract.

	All of the Futures Contracts held by each Trust Series were exchange-traded through March 31, 2014. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with over-the-counter transactions since, in over-the-counter transactions, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if each Trust Series were to enter into non-exchange traded contracts, it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. Currently, each Trust Series has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, each Trust Series bears the risk of financial failure by the clearing broker.

	A Trust Series’ cash and other property, such as Treasuries, deposited with a futures commission merchant are considered commingled with all other customer funds, subject to the futures commission merchant’s segregation requirements. In the event of a futures commission merchant’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of a futures commission merchant could result in the complete loss of a Trust Series’ assets posted with that futures commission merchant; however, the majority of each Trust Series’ assets are held in Treasuries, cash and/or cash equivalents with the Trust Series’ custodian and would not be impacted by the insolvency of a futures commission merchant. The failure or insolvency of the Trust Series’ custodian, however, could result in a substantial loss of each Trust Series’ assets.

	USCF may invest a portion of each Trust Series’ cash in money market funds that seek to maintain a stable per share NAV. Each Trust Series may be exposed to any risk of loss associated with an investment in such money market funds. As of March 31, 2014 and December 31, 2013, none of the Trust Series held investments in money market funds. Each Trust Series holds cash deposits with its custodian. Pursuant to a written agreement with BBH&Co., uninvested overnight cash balances are swept to offshore branches of U.S. regulated and domiciled banks located in Toronto, Canada; London, United Kingdom; Grand Cayman, Cayman Islands; and Nassau, Bahamas; which are subject to U.S. regulation and regulatory oversight. As of March 31, 2014 and December 31, 2013, USCI held cash deposits and investments in Treasuries in the amounts of $562,668,687 and $494,440,076, respectively, with the custodian and futures commission merchant. As of March 31, 2014 and December 31, 2013, CPER held cash deposits and investments in Treasuries in the amounts of $3,162,361 and $2,166,695, respectively, with the custodian and futures commission merchant. As of March 31, 2014 and December 31, 2013, USAG held cash deposits and investments in Treasuries in the amounts of $2,480,075 and $2,328,626, respectively, with the custodian and futures commission merchant. As of March 31, 2014 and December 31, 2013, USMI held cash deposits and investments in Treasuries in the amounts of $2,209,215 and $2,248,304, respectively, with the custodian and futures commission merchant. Some or all of these amounts may be subject to loss should the Trust Series’ custodian and/or futures commission merchant cease operations.

	For derivatives, risks arise from changes in the market value of the contracts. Theoretically, each Trust Series is exposed to market risk equal to the value of Futures Contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, each Trust Series pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option.

	The Trust Series’ policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, the Trust Series or USCF have a policy of requiring review of the credit standing of each broker or counterparty with which they conduct business.

	The financial instruments held by the applicable Trust Series are reported in its condensed statements of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

Financial_Highlights

Financial Highlights	3 Months Ended
Financial Highlights	Mar. 31, 2014
Financial Highlights [Abstract]	'
Financial Highlights	'
	NOTE 7 - FINANCIAL HIGHLIGHTS

	The following tables present per share performance data and other supplemental financial data for each Trust Series for the three months ended March 31, 2014 and 2013 for the shareholders. This information has been derived from information presented in the condensed financial statements.

	USCI

			For the three months ended				For the three months ended
			March 31, 2014				March 31, 2013
			(Unaudited)				(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period		$	56.06			$	58.45
	Total income (loss)			2.7				-1.29
	Total expenses			-0.16				-0.16
	Net increase (decrease) in net asset value			2.54				-1.45
	Net asset value, end of period		$	58.6			$	57

	Total Return			4.53	%			-2.48	%

	Ratios to Average Net Assets
	Total income (loss)			4.73	%			-2.33	%
	Expenses excluding management fees*			0.2	%			0.15	%
	Management fees*			0.95	%**			0.95	%**
	Net income (loss)			4.45	%			-2.6	%

	*	Annualized.
	**	Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USCI to 0.80% per annum of average daily total net assets.

	CPER

			For the three months ended				For the three months ended
			March 31, 2014				March 31, 2013
			(Unaudited)				(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period		$	22.92			$	25.43
	Total income (loss)			-2.44				-1.69
	Net expenses			-0.05				-0.05
	Net increase (decrease) in net asset value			-2.49				-1.74
	Net asset value, end of period		$	20.43			$	23.69

	Total Return			-10.86	%			-6.84	%

	Ratios to Average Net Assets
	Total income (loss)			-9.53	%			-6.72	%
	Management fees*			0.65	%**			0.65	%**
	Total expenses excluding management fees*			2.75	%			4.02	%
	Expenses waived*			-2.51	%			-3.85	%
	Net expenses excluding management fees*			0.24	%			0.17	%
	Net income (loss)			-9.75	%			-6.92	%

	*	Annualized.
	**	Effective as of May 29, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by CPER from 0.95% to 0.65% per annum of average daily total net assets. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by CPER to 0.65% per annum of average daily total net assets.

	USAG

			For the three months ended				For the three months ended
			March 31, 2014				March 31, 2013
			(Unaudited)				(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period		$	22.79			$	25.56
	Total income (loss)			3.5				-1.49
	Net expenses			-0.06				-0.06
	Net increase (decrease) in net asset value			3.44				-1.55
	Net asset value, end of period		$	26.23			$	24.01

Total Return			15.09	%			-6.06	%

Ratios to Average Net Assets
Total income (loss)			14.46	%			-5.97	%
Management fees*			0.8	%**			0.8	%**
Total expenses excluding management fees*			0.99	%			5.13	%
Expenses waived*			-0.75	%			-4.87	%
Net expenses excluding management fees*			0.24	%			0.26	%
Net income (loss)			14.2	%			-6.23	%

*	Annualized.
**	Effective as of May 29, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by USAG from 0.95% to 0.80% per annum of average daily total net assets. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USAG to 0.65% per annum of average daily total net assets.
**
USMI

		For the three months ended				For the three months ended
		March 31, 2014				March 31, 2013
		(Unaudited)				(Unaudited)
Per Share Operating Performance:
Net asset value, beginning of period		$	21.97			$	26.47
Total income (loss)			-0.09				-1.24
Net expenses			-0.05				-0.06
Net increase (decrease) in net asset value			-0.14				-1.3
Net asset value, end of period		$	21.83			$	25.17

Total Return			-0.64	%			-4.91	%

Ratios to Average Net Assets
Total income (loss)			-0.4	%			-4.69	%
Management fees*			0.7	%**			0.7	%**
Total expenses excluding management fees*			1.05	%			4.77	%
Expenses waived*			-0.84	%			-4.57	%
Net expenses excluding management fees*			0.21	%			0.2	%
Net income (loss)			-0.62	%			-4.91	%

*	Annualized.
**	Effective as of May 30, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by USMI from 0.95% to 0.70% per annum of average daily total net assets. The reduced fee became operational as of June 19, 2012. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USMI to 0.65% per annum of average daily total net assets.

Total returns are calculated based on the change in value during the period. An individual shareholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from each Trust Series.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

NOTE 8 — FAIR VALUE OF FINANCIAL INSTRUMENTS

The Trust and each Trust Series value their investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of the Trust and each Trust Series (observable inputs) and (2) the Trust’s and each Trust Series’ own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows:

Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs).

Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available.

In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety.

The following table summarizes the valuation of USCI’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

309,955,163

—

Exchange-Traded Futures Contracts

Foreign Contracts

1,686,671

—

United States Contracts

7,620,452

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USCI’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

325,142,075

—

Exchange-Traded Futures Contracts

Foreign Contracts

6,218,462

—

United States Contracts

4,571,285

—

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

The following table summarizes the valuation of CPER’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

1,329,814

—

Exchange-Traded Futures Contracts

United States Contracts

-95,737

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of CPER’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

1,599,705

—

Exchange-Traded Futures Contracts

United States Contracts

130,163

—

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USAG’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

1,469,793

—

Exchange-Traded Futures Contracts

Foreign Contracts

82,333

—

United States Contracts

63,157

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USAG’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

1,499,678

—

Exchange-Traded Futures Contracts

Foreign Contracts

2,216

—

United States Contracts

-46,749

—

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USMI’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

1,099,879

—

Exchange-Traded Futures Contracts

Foreign Contracts

-25,884

—

United States Contracts

2,108

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USMI’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

1,199,914

—

Exchange-Traded Futures Contracts

Foreign Contracts

-12,610

—

United States Contracts

-33,683

—

During the year ended December 31, 2013 there were no transfers between Level I and Level II.

The Trust and each Trust Series have adopted the provisions of Accounting Standards Codification 815 – Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives.

Fair Value of Derivative Instruments Held by USCI

Derivatives not

Condensed

Fair Value

Accounted for

Statements of Financial

At March 31,

At December

as Hedging

Condition Location

2014

31, 2013

Instruments

Futures - Commodity Contracts

Assets

9,307,123

10,789,747

Fair Value of Derivative Instruments Held by CPER

Derivatives not

Condensed

Fair Value

Accounted for

Statements of Financial

At March 31,

At December

as Hedging

Condition Location

2014

31, 2013

Instruments

Futures - Commodity Contracts

Assets

-95,737

130,163

Fair Value of Derivative Instruments Held by USAG

Derivatives not

Accounted for

Condensed

Fair Value

as Hedging

Statements of Financial

At March 31,

At December

Instruments

Condition Location

2014

31, 2013

Futures – Commodity Contracts

Assets

145,490

-44,533

Fair Value of Derivative Instruments Held by USMI

Derivatives not

Accounted for

Condensed

Fair Value

as Hedging

Statements of Financial

At March 31,

At December

Instruments

Condition Location

2014

31, 2013

Futures – Commodity Contracts

Assets

-23,776

-46,293

The Effect of Derivative Instruments on the Condensed Statements of Operations of USCI

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized gain on closed positions

26,871,173

3,087,724

Change in unrealized loss on open positions

-1,482,624

-15,109,247

The Effect of Derivative Instruments on the Condensed Statements of Operations of CPER

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized gain on closed positions

5,663

32,050

Change in unrealized loss on open positions

-225,900

-201,738

The Effect of Derivative Instruments on the Condensed Statements of Operations of USAG

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized gain (loss) on closed positions

160,134

-160,486

Change in unrealized gain on open positions

190,023

11,844

The Effect of Derivative Instruments on the Condensed Statements of Operations of USMI

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized loss on closed positions

-31,573

-19,562

Change in unrealized gain (loss) on open positions

22,517

-104,860

Subsequent_Events

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	NOTE 9 – SUBSEQUENT EVENTS

	The Trust and each Trust Series have performed an evaluation of subsequent events through the date the condensed financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments.

Summary_Of_Significant_Account1

Summary Of Significant Accounting Policies (Policies)	3 Months Ended
Summary Of Significant Accounting Policies (Policies)	Mar. 31, 2014
Basis of Presentation	'
	Basis of Presentation

	The financial statements have been prepared in conformity with GAAP as detailed in the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification. Each Trust Series is an investment company and follows the accounting and reporting guidance in FASB Topic 946.

Revenue Recognition	'
	Revenue Recognition

	Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statements of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statements of operations. Each Trust Series earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant at the 90-day Treasury bill rate. In addition, each Trust Series earns income on funds held at the custodian and/or futures commission merchant at prevailing market rates earned on such investments.

Brokerage Commissions	'
	Brokerage Commissions

	Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

Income Taxes	'
	Income Taxes

	The Trust Series are not subject to federal income taxes; each investor reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

	In accordance with accounting principles generally accepted in the United States of America (“GAAP”), each Trust Series is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. Each Trust Series files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. None of the Trust Series is subject to income tax return examinations by major taxing authorities for years before 2010 (year of the Trust Series’ inception, but not necessarily the commencement of operations for each Trust Series). The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in each Trust Series recording a tax liability that reduces net assets. However, each Trust Series’ conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analysis of and changes to tax laws, regulations and interpretations thereof. Each Trust Series recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended March 31, 2014 for any Trust Series.

Trust Capital and Allocation of Income and Losses	'
	Trust Capital and Allocation of Income and Losses

	Profit or loss shall be allocated among the shareholders of each Trust Series in proportion to the number of shares each investor holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the Trust Agreement.

Creations and Redemptions	'
	Creations and Redemptions

	Authorized Purchasers may purchase Creation Baskets or redeem Redemption Baskets for USCI, CPER, USAG and USMI only in blocks of 50,000 shares at a price equal to the NAV of the shares calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

	Each Trust Series receives or pays the proceeds from shares sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Purchasers are reflected in each Trust Series’ condensed statements of financial condition as receivable for shares sold, and amounts payable to Authorized Purchasers upon redemption are reflected as payable for shares redeemed.

	Authorized Purchasers pay each Trust Series a fee of $350 for each order placed to create one or more Creation Baskets or to redeem one or more Redemption Baskets.

Calculation of Net Asset Value Per Unit	'
	Calculation of Net Asset Value Per Share

	Each Trust Series’ per share NAV is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing the amount by the total number of shares outstanding. Each Trust Series uses the closing prices on the relevant Futures Exchanges (as defined in Note 3 below) of the Applicable Benchmark Component Futures Contracts (as defined in Note 3 below) that at any given time make up the Applicable Index (as defined in Note 3 below) (determined at the earlier of the close of such exchange or 2:30 p.m. New York time) for the contracts traded on the Futures Exchanges, but calculates or determines the value of all other investments of each Trust Series using market quotations, if available, or other information customarily used to determine the fair value of such investments.

Net Income (Loss) Per Share	'
	Net Income (Loss) Per Share

	Net income (loss) per share is the difference between the per share NAV at the beginning of each period and the per share NAV at the end of each period. The weighted average number of shares outstanding was computed for purposes of disclosing net income (loss) per weighted average share. The weighted average shares are equal to the number of shares outstanding at the end of the period, adjusted proportionately for shares added and redeemed based on the amount of time the shares were outstanding during such period. As of March 31, 2014, USCF held 5 shares of USCI, 40 shares of CPER, 5 shares of USAG and 5 shares of USMI.

Offering Costs	'
	Offering Costs

	Offering costs incurred in connection with the registration of shares prior to the commencement of the offering are borne by USCF. Offering costs incurred in connection with the registration of additional shares after the commencement of the offering are borne by each Trust Series. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. Costs borne by the Trust Series after the commencement of an offering are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

Cash Equivalents	'
	Cash Equivalents

	Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of six months or less.

Use of Estimates	'
	Use of Estimates

	The preparation of condensed financial statements in conformity with GAAP requires USCF to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

Contracts_And_Agreements_Table

Contracts And Agreements (Tables)	3 Months Ended
Contracts And Agreements (Tables)	Mar. 31, 2014
Contractors [Abstract]	'
Brokerage Commissions	'
	USCI

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	101,246		$	92,612
	Commissions accrued as a result of rebalancing	$	98,726		$	90,204
	Percentage of commissions accrued as a result of Rebalancing		97.51	%		97.4	%
	Commissions accrued as a result of creation and redemption activity	$	2,520		$	2,408
	Percentage of commissions accrued as a result of creation and redemption activity		2.49	%		2.6	%


	CPER

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	368		$	46
	Commissions accrued as a result of rebalancing	$	292		$	46
	Percentage of commissions accrued as a result of Rebalancing		79.38	%		100	%
	Commissions accrued as a result of creation and redemption activity	$	76		$	-
	Percentage of commissions accrued as a result of creation and redemption activity		20.62	%		-	%


	USAG

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	401		$	571
	Commissions accrued as a result of rebalancing	$	401		$	571
	Percentage of commissions accrued as a result of Rebalancing		100	%		100	%
	Commissions accrued as a result of creation and redemption activity	$	-		$	-
	Percentage of commissions accrued as a result of creation and redemption activity		-	%		-	%


	USMI

		For the three months ended			For the three months ended
		March 31, 2014			March 31, 2013
	Total commissions accrued to brokers	$	194		$	246
	Commissions accrued as a result of rebalancing	$	194		$	246
	Percentage of commissions accrued as a result of Rebalancing		100	%		100	%
	Commissions accrued as a result of creation and redemption activity	$	-		$	-
	Percentage of commissions accrued as a result of creation and redemption activity		-	%		-	%

Financial_Highlights_Tables

Financial Highlights (Tables)	3 Months Ended
Financial Highlights (Tables)	Mar. 31, 2014
Financial Highlights [Abstract]	'
Per Unit Performance Data and Other Supplemental Financial Data for Usci, Cper, Usag and Usmi	'
	The following tables present per share performance data and other supplemental financial data for each Trust Series for the three months ended March 31, 2014 and 2013 for the shareholders. This information has been derived from information presented in the condensed financial statements.

	USCI

			For the three months ended				For the three months ended
			March 31, 2014				March 31, 2013
			(Unaudited)				(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period		$	56.06			$	58.45
	Total income (loss)			2.7				-1.29
	Total expenses			-0.16				-0.16
	Net increase (decrease) in net asset value			2.54				-1.45
	Net asset value, end of period		$	58.6			$	57

	Total Return			4.53	%			-2.48	%

	Ratios to Average Net Assets
	Total income (loss)			4.73	%			-2.33	%
	Expenses excluding management fees*			0.2	%			0.15	%
	Management fees*			0.95	%**			0.95	%**
	Net income (loss)			4.45	%			-2.6	%

	*	Annualized.
	**	Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USCI to 0.80% per annum of average daily total net assets.

	CPER

			For the three months ended				For the three months ended
			March 31, 2014				March 31, 2013
			(Unaudited)				(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period		$	22.92			$	25.43
	Total income (loss)			-2.44				-1.69
	Net expenses			-0.05				-0.05
	Net increase (decrease) in net asset value			-2.49				-1.74
	Net asset value, end of period		$	20.43			$	23.69

	Total Return			-10.86	%			-6.84	%

	Ratios to Average Net Assets
	Total income (loss)			-9.53	%			-6.72	%
	Management fees*			0.65	%**			0.65	%**
	Total expenses excluding management fees*			2.75	%			4.02	%
	Expenses waived*			-2.51	%			-3.85	%
	Net expenses excluding management fees*			0.24	%			0.17	%
	Net income (loss)			-9.75	%			-6.92	%

	*	Annualized.
	**	Effective as of May 29, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by CPER from 0.95% to 0.65% per annum of average daily total net assets. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by CPER to 0.65% per annum of average daily total net assets.

	USAG

			For the three months ended				For the three months ended
			March 31, 2014				March 31, 2013
			(Unaudited)				(Unaudited)
	Per Share Operating Performance:
	Net asset value, beginning of period		$	22.79			$	25.56
	Total income (loss)			3.5				-1.49
	Net expenses			-0.06				-0.06
	Net increase (decrease) in net asset value			3.44				-1.55
	Net asset value, end of period		$	26.23			$	24.01

	Total Return			15.09	%			-6.06	%

Ratios to Average Net Assets
Total income (loss)			14.46	%			-5.97	%
Management fees*			0.8	%**			0.8	%**
Total expenses excluding management fees*			0.99	%			5.13	%
Expenses waived*			-0.75	%			-4.87	%
Net expenses excluding management fees*			0.24	%			0.26	%
Net income (loss)			14.2	%			-6.23	%

*	Annualized.
**	Effective as of May 29, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by USAG from 0.95% to 0.80% per annum of average daily total net assets. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USAG to 0.65% per annum of average daily total net assets.
**
USMI

		For the three months ended				For the three months ended
		March 31, 2014				March 31, 2013
		(Unaudited)				(Unaudited)
Per Share Operating Performance:
Net asset value, beginning of period		$	21.97			$	26.47
Total income (loss)			-0.09				-1.24
Net expenses			-0.05				-0.06
Net increase (decrease) in net asset value			-0.14				-1.3
Net asset value, end of period		$	21.83			$	25.17

Total Return			-0.64	%			-4.91	%

Ratios to Average Net Assets
Total income (loss)			-0.4	%			-4.69	%
Management fees*			0.7	%**			0.7	%**
Total expenses excluding management fees*			1.05	%			4.77	%
Expenses waived*			-0.84	%			-4.57	%
Net expenses excluding management fees*			0.21	%			0.2	%
Net income (loss)			-0.62	%			-4.91	%

*	Annualized.
**	Effective as of May 30, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by USMI from 0.95% to 0.70% per annum of average daily total net assets. The reduced fee became operational as of June 19, 2012. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USMI to 0.65% per annum of average daily total net assets.

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Valuation of Usci's, Cper's, Usag's and Usmi's Securities Using Fair Value Hierarchy

The following table summarizes the valuation of USCI’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

309,955,163

—

Exchange-Traded Futures Contracts

Foreign Contracts

1,686,671

—

United States Contracts

7,620,452

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USCI’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

325,142,075

—

Exchange-Traded Futures Contracts

Foreign Contracts

6,218,462

—

United States Contracts

4,571,285

—

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

The following table summarizes the valuation of CPER’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

1,329,814

—

Exchange-Traded Futures Contracts

United States Contracts

-95,737

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of CPER’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

1,599,705

—

Exchange-Traded Futures Contracts

United States Contracts

130,163

—

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USAG’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

1,469,793

—

Exchange-Traded Futures Contracts

Foreign Contracts

82,333

—

United States Contracts

63,157

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USAG’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

1,499,678

—

Exchange-Traded Futures Contracts

Foreign Contracts

2,216

—

United States Contracts

-46,749

—

During the year ended December 31, 2013, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USMI’s securities at March 31, 2014 using the fair value hierarchy:

At March 31, 2014

Total

Level I

Level II

Level III

Short-Term Investments

1,099,879

—

Exchange-Traded Futures Contracts

Foreign Contracts

-25,884

—

United States Contracts

2,108

—

During the three months ended March 31, 2014, there were no transfers between Level I and Level II.

The following table summarizes the valuation of USMI’s securities at December 31, 2013 using the fair value hierarchy:

At December 31, 2013

Total

Level I

Level II

Level III

Short-Term Investments

1,199,914

—

Exchange-Traded Futures Contracts

Foreign Contracts

-12,610

—

United States Contracts

-33,683

—

During the year ended December 31, 2013 there were no transfers between Level I and Level II.

Fair Value of Derivative Instruments Held by Usci, Cper, Usag and Usmi

Fair Value of Derivative Instruments Held by USCI

Derivatives not

Condensed

Fair Value

Accounted for

Statements of Financial

At March 31,

At December

as Hedging

Condition Location

2014

31, 2013

Instruments

Futures - Commodity Contracts

Assets

9,307,123

10,789,747

Fair Value of Derivative Instruments Held by CPER

Derivatives not

Condensed

Fair Value

Accounted for

Statements of Financial

At March 31,

At December

as Hedging

Condition Location

2014

31, 2013

Instruments

Futures - Commodity Contracts

Assets

-95,737

130,163

Fair Value of Derivative Instruments Held by USAG

Derivatives not

Accounted for

Condensed

Fair Value

as Hedging

Statements of Financial

At March 31,

At December

Instruments

Condition Location

2014

31, 2013

Futures – Commodity Contracts

Assets

145,490

-44,533

Fair Value of Derivative Instruments Held by USMI

Derivatives not

Accounted for

Condensed

Fair Value

as Hedging

Statements of Financial

At March 31,

At December

Instruments

Condition Location

2014

31, 2013

Futures – Commodity Contracts

Assets

-23,776

-46,293

Effect of Derivative Instruments on Statements of Operations of Usci, Cper, Usag and Usmi

Fair Value of Derivative Instruments Held by USAG

Derivatives not

Accounted for

Condensed

Fair Value

as Hedging

Statements of Financial

At March 31,

At December

Instruments

Condition Location

2014

31, 2013

Futures – Commodity Contracts

Assets

145,490

-44,533

Fair Value of Derivative Instruments Held by USMI

Derivatives not

Accounted for

Condensed

Fair Value

as Hedging

Statements of Financial

At March 31,

At December

Instruments

Condition Location

2014

31, 2013

Futures – Commodity Contracts

Assets

-23,776

-46,293

The Effect of Derivative Instruments on the Condensed Statements of Operations of USCI

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized gain on closed positions

26,871,173

3,087,724

Change in unrealized loss on open positions

-1,482,624

-15,109,247

The Effect of Derivative Instruments on the Condensed Statements of Operations of CPER

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized gain on closed positions

5,663

32,050

Change in unrealized loss on open positions

-225,900

-201,738

The Effect of Derivative Instruments on the Condensed Statements of Operations of USAG

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized gain (loss) on closed positions

160,134

-160,486

Change in unrealized gain on open positions

190,023

11,844

The Effect of Derivative Instruments on the Condensed Statements of Operations of USMI

For the three months ended

March 31, 2014

March 31, 2013

Change in

Location of

Realized

Unrealized

Realized

Unrealized

Derivatives not

Gain or (Loss)

Accounted for

on Derivatives

as Hedging

Recognized in

Instruments

Income

Futures - Commodity Contracts

Realized loss on closed positions

-31,573

-19,562

Change in unrealized gain (loss) on open positions

22,517

-104,860

Organization_And_Business_Addi

Organization And Business (Additional Information) (Details)

Mar. 31, 2014

Aug. 10, 2010

Mar. 31, 2014

Nov. 15, 2011

Mar. 31, 2014

Apr. 13, 2012

Mar. 31, 2014

Jun. 19, 2012

Mar. 31, 2014

Redemption Baskets [Member]

United States Commodity Index Fund [Member]

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

Prior to May 1, 2012 [Member]

Creation Baskets [Member]

Marketing Agent [Member]

Redemption Baskets [Member]

Creation Baskets [Member]

Marketing Agent [Member]

Redemption Baskets [Member]

Creation Baskets [Member]

Marketing Agent [Member]

Redemption Baskets [Member]

Marketing Agent [Member]

Redemption Baskets [Member]

Effective as of May 1, 2012 [Member]

Prior to May 1, 2012 [Member]

Effective as of May 1, 2012 [Member]

Prior to May 1, 2012 [Member]

Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]

Number of Units per basket

50,000

100,000

50,000

100,000

50,000

100,000

50,000

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets

1,000

350

1,000

350

1,000

350

1,000

350

1,000

Summary_Of_Significant_Account2

Summary Of Significant Accounting Policies (Additional Information) (Details)

3 Months Ended

Mar. 31, 2014

Jun. 19, 2012

Mar. 31, 2014

Aug. 10, 2010

Mar. 31, 2014

Nov. 15, 2011

Mar. 31, 2014

Apr. 13, 2012

Mar. 31, 2014

United States Metals Index Fund [Member]

United States Commodity Index Fund [Member]

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

Creation Baskets [Member]

Redemption Baskets [Member]

Marketing Agent [Member]

United States Commodity Index Fund [Member]

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

United States Commodity Index Fund [Member]

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

United States Commodity Index Fund [Member]

Significant Accounting Policies [Line Items]

Minimum likelihood of tax benefits being recognized upon ultimate settlement

50.00%

Number of Units per basket

50,000

100,000

Cash equivalents maturity period

'6 months

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets

350

1,000

350

Weighted average shares outstanding

Trust_Series_Additional_Inform

Trust Series (Additional Information) (Details) (USD $)

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

Sep. 14, 2011

Mar. 31, 2014

Dec. 31, 2013

Dec. 21, 2009

Aug. 10, 2010

Jun. 30, 2010

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2014

Sep. 06, 2011

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Apr. 13, 2012

Nov. 10, 2010

Mar. 31, 2014

Sep. 06, 2011

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Jun. 19, 2012

Nov. 10, 2010

Mar. 31, 2014

Nov. 15, 2011

Sep. 06, 2011

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2013

Dec. 31, 2012

Nov. 10, 2010

Mar. 31, 2014

United States Commodity Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

United States Copper Index Fund [Member]

Number

Futures Contracts [Member]

Number

Futures Contracts [Member]

Number

Futures Contracts [Member]

Number

Futures Contracts [Member]

Number

NYMEX [Member]

Ice Futures [Member]

Chicago Board of Trade [Member]

Chicago Mercantile Exchange [Member]

London Metal Exchange [Member]

Commodity Exchange Inc [Member]

SummerHaven Indexing [Member]

Number

Ice Futures [Member]

Chicago Board of Trade [Member]

Chicago Mercantile Exchange [Member]

Kansas City Board Of Trade [Member]

SummerHaven Indexing [Member]

Number

NYMEX [Member]

London Metal Exchange [Member]

Commodity Exchange Inc [Member]

SummerHaven Indexing [Member]

Commodity Exchange Inc [Member]

Number

Capital Unit [Line Items]

Sponsor capital contribution

$1,000

$3,000

Capital contribution to trust series

1,000

Units acquisition

Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission

50,000,000

20,000,000

30,000,000

Commenced investment operations date

10-Aug-10

15-Nov-11

Initial offering price per unit NAV

$50

$58.60

$56.06

$57

$58.45

$26.23

$22.79

$24.01

$25.56

$25

$21.83

$21.97

$25.17

$26.47

$25

$20.43

$22.92

$23.69

$25.43

Number of units issued

100,000

Value of unit issued

$5,000,000

$2,500,000

Number of registered units

100,000

Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets

1,000

350

1,000

Future contract held

16,564

1,870

3,231

1,573

2,007

7,336

547

Partner sponsor units description

'On November 14, 2011, USCF received 40 Sponsor Shares of CPER in exchange for the previously received capital contribution, representing a beneficial interest in CPER. On December 7, 2011, USCF redeemed the 40 Sponsor Shares of CPER and purchased 40 shares of CPER in the open market. On April 13, 2012, USCF received 40 Sponsor Shares of USAG in exchange for the previously received capital contribution, representing a beneficial interest in USAG. On June 28, 2012, USCF redeemed the 40 Sponsor Shares of USAG and on October 3, 2012, purchased 5 shares of USAG on the open market. On June 19, 2012, USCF received 40 Sponsor Shares of USMI in exchange for the previously received capital contribution, representing a beneficial interest in USMI. On August 27, 2012, USCF redeemed the 40 Sponsor Shares of USMI and, on September 4, 2013, purchased 5 shares of USMI on the open market.

Fees_Paid_By_Each_Trust_Series1

Fees Paid By Each Trust Series And Related Party Transactions (Additional Information) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fees Paid and Related Party Transactions [Line Items]	'	'
Trustee annual fee	$3,000	'
Noninterest Expense Directors Fees	560,625	'
Expense waiver	23,362	83,562
United States Commodity Index Fund [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Estimated investor tax reporting cost	350,000	'
Expense waiver	0	0
United States Commodity Index Fund [Member] \| Effective as of May 29, 2012 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.95%	'
United States Commodity Index Fund [Member] \| Effective as of May 30, 2012 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.95%	'
United States Commodity Index Fund [Member] \| Effective May 1, 2014 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.80%	'
United States Copper Index Fund [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Estimated investor tax reporting cost	55,000	'
Costs and expenses annual limit for reimbursement	0.15%	'
Expense waiver	14,268	23,895
United States Copper Index Fund [Member] \| Effective as of May 29, 2012 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.65%	'
United States Copper Index Fund [Member] \| Effective May 1, 2014 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.65%	'
United States Agriculture Index Fund [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Estimated investor tax reporting cost	55,000	'
Costs and expenses annual limit for reimbursement	0.15%	'
Expense waiver	4,511	29,863
United States Agriculture Index Fund [Member] \| Effective as of May 29, 2012 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.80%	'
United States Agriculture Index Fund [Member] \| Effective May 1, 2014 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.65%	'
United States Metals Index Fund [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Estimated investor tax reporting cost	55,000	'
Costs and expenses annual limit for reimbursement	0.15%	'
Expense waiver	$4,583	$29,804
United States Metals Index Fund [Member] \| Effective as of May 30, 2012 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.70%	'
United States Metals Index Fund [Member] \| Effective May 1, 2014 [Member]	'	'
Fees Paid and Related Party Transactions [Line Items]	'	'
Percentage of average daily net assets paid	0.65%	'

Contracts_And_Agreements_Broke

Contracts And Agreements (Brokerage Commission) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	$102,209	$93,475
United States Commodity Index Fund [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	101,246	92,612
United States Commodity Index Fund [Member] \| Rebalancing Investments Transaction [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	98,726	90,204
Brokerage commissions as a percentage of average daily net assets	97.51%	97.40%
United States Commodity Index Fund [Member] \| Creation and Redemption Activity [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	2,520	2,408
Brokerage commissions as a percentage of average daily net assets	2.49%	2.60%
United States Copper Index Fund [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	368	46
United States Copper Index Fund [Member] \| Rebalancing Investments Transaction [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	292	46
Brokerage commissions as a percentage of average daily net assets	79.38%	100.00%
United States Copper Index Fund [Member] \| Creation and Redemption Activity [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	76	0
Brokerage commissions as a percentage of average daily net assets	20.62%	0.00%
United States Agriculture Index Fund [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	401	571
United States Agriculture Index Fund [Member] \| Rebalancing Investments Transaction [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	401	571
Brokerage commissions as a percentage of average daily net assets	100.00%	100.00%
United States Agriculture Index Fund [Member] \| Creation and Redemption Activity [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	0	0
Brokerage commissions as a percentage of average daily net assets	0.00%	0.00%
United States Metals Index Fund [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	194	246
United States Metals Index Fund [Member] \| Rebalancing Investments Transaction [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	194	246
Brokerage commissions as a percentage of average daily net assets	100.00%	100.00%
United States Metals Index Fund [Member] \| Creation and Redemption Activity [Member]	'	'
Long Duration Contracts Assumptions By Product and Guarantee [Line Items]	'	'
Brokerage commissions	$0	$0
Brokerage commissions as a percentage of average daily net assets	0.00%	0.00%

Contracts_And_Agreements_Addit

Contracts And Agreements (Additional Information) (Details) (USD $)

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Mar. 31, 2013

Mar. 31, 2014

Licensing Agreements [Member]

United States Commodity Index Fund [Member]

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

Maximum [Member]

Minimum [Member]

For the first $500 million [Member]

Combined net assets greater than $500 million but less than $1 billion [Member]

Combined net assets exceed $1 billion [Member]

Marketing Agreement [Member]

Futures Contracts and options on Futures Contracts [Member]

Maximum [Member]

Minimum [Member]

On each Trust Series' assets up to 3 billion [Member]

On each Trust Series' assets in excess of $3 billion [Member]

Maximum [Member]

Minimum [Member]

Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]

Fee percentage

0.06%

0.05%

0.04%

0.06%

0.04%

Base amount for determining fee percentage

$75,000

$500,000,000

$1,000,000,000

$500,000,000

$1,000,000,000

$3,000,000,000

Annual transfer agency services fee

20,000

Transaction fees per transaction

Commissions per round-turn trade, including applicable exchange and NFA fees for Futures Contracts and options on Futures Contracts

Brokerage commissions as a percentage of average daily net assets

0.08%

0.07%

0.06%

0.00%

0.07%

0.10%

0.04%

Annual licensing fee

$15,000

Management fee paid to SummerHaven by USCF

'an annual fee of 0.06% of the average daily total net assets of each Trust Series.

Management fee description

'For USCI, the fee is equal to the percentage fees paid to USCF minus 0.14%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid. For each of CPER, USAG and USMI, the fee is equal to the percentage fees paid to USCF minus 0.18%, with that result multiplied by 0.5, minus 0.06% to arrive at the actual fee paid.

'15,000

Recovered_Sheet1

Financial Instruments, Off-Balance Sheet Risks and Contingencies (Additional Information) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
United States Commodity Index Fund [Member]	'	'
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]	'	'
Cash deposits and investments in Treasuries	$562,668,687	$494,440,076
United States Copper Index Fund [Member]	'	'
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]	'	'
Cash deposits and investments in Treasuries	3,162,361	2,166,695
United States Agriculture Index Fund [Member]	'	'
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]	'	'
Cash deposits and investments in Treasuries	2,480,075	2,328,626
United States Metals Index Fund [Member]	'	'
Carrying Amounts and Fair Values of Financial Instruments or Liabilities [Line Items]	'	'
Cash deposits and investments in Treasuries	$2,209,215	$2,248,304

Financial_Highlights_Per_Unit_

Financial Highlights (Per Unit Performance Data and Other Supplemental Financial Data) (Details) (USD $)

3 Months Ended

Mar. 31, 2014

Mar. 31, 2013

Aug. 10, 2010

Mar. 31, 2014

Mar. 31, 2013

Nov. 15, 2011

Mar. 31, 2014

Mar. 31, 2013

Apr. 13, 2012

Mar. 31, 2014

Mar. 31, 2013

Jun. 19, 2012

United States Commodity Index Fund [Member]

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

Per Share Operating Performance:

Net asset value, beginning of period

$56.06

$58.45

$50

$22.92

$25.43

$25

$22.79

$25.56

$25

$21.97

$26.47

$25

Total income (loss)

$2.70

($1.29)

($2.44)

($1.69)

$3.50

($1.49)

($0.09)

($1.24)

Total expenses

($0.16)

($0.05)

($0.06)

($0.05)

($0.06)

Net increase (decrease) in net asset value

$2.54

($1.45)

($2.49)

($1.74)

$3.44

($1.55)

($0.14)

($1.30)

Net asset value, end of period

$58.60

$57

$50

$20.43

$23.69

$25

$26.23

$24.01

$25

$21.83

$25.17

$25

Total Return

4.53%

-2.48%

-10.86%

-6.84%

15.09%

-6.06%

-0.64%

-4.91%

Ratios to Average Net Assets

Total income (loss)

4.73%

-2.33%

-9.53%

-6.72%

14.46%

-5.97%

-0.40%

-4.69%

Management fees

0.95%

[1]

0.95%

[1]

0.65%

[2],[3]

0.65%

[2],[3]

0.80%

[2],[4]

0.80%

[2],[4]

0.70%

[2],[5]

0.70%

[2],[5]

Total expenses excluding management fees

0.20%

[2]

0.15%

[2]

2.75%

[2]

4.02%

[2]

0.99%

[2]

5.13%

[2]

1.05%

[2]

4.77%

[2]

Expenses waived

-0.80%

-2.51%

[2]

-3.85%

[2]

-0.75%

[2]

-4.87%

[2]

-0.84%

[2]

-4.57%

[2]

Net expenses excluding management fees

0.24%

[2]

0.17%

[2]

0.24%

[2]

0.26%

[2]

0.21%

[2]

0.20%

[2]

Net income (loss)

4.45%

-2.60%

-9.75%

-6.92%

14.20%

-6.23%

-0.62%

-4.91%

[1]

Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USCI to 0.80% per annum of average daily total net assets.

[2]

Annualized.

[3]

Effective as of May 29, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by CPER from 0.95% to 0.65% per annum of average daily total net assets. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by CPER to 0.65% per annum of average daily total net assets.

[4]

Effective as of May 29, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by USAG from 0.95% to 0.80% per annum of average daily total net assets. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USAG to 0.65% per annum of average daily total net assets.

[5]

Effective as of May 30, 2012 (and continuing through April 30, 2014), USCF voluntarily agreed to waive the management fee paid by USMI from 0.95% to 0.70% per annum of average daily total net assets. The reduced fee became operational as of June 19, 2012. Effective May 1, 2014 and continuing through December 31, 2015, USCF contractually agreed to lower the management fee paid by USMI to 0.65% per annum of average daily total net assets.

Financial_Highlights_Per_Unit_1

Financial Highlights (Per Unit Performance Data and Other Supplemental Financial Data) (Parenthetical) (Details)

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

Mar. 31, 2014

Mar. 31, 2013

29-May-12

Mar. 31, 2014

Mar. 31, 2013

29-May-12

Mar. 31, 2014

Mar. 31, 2013

30-May-12

United States Copper Index Fund [Member]

United States Agriculture Index Fund [Member]

United States Metals Index Fund [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Average Sales Price and Production Costs Per Unit of Production [Line Items]

Percentage of average daily net assets paid monthly, waiver expense

0.80%

2.51%

[1]

3.85%

[1]

0.95%

0.65%

0.75%

[1]

4.87%

[1]

0.95%

0.80%

0.84%

[1]

4.57%

[1]

0.95%

0.70%

[1]

Annualized.

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Valuation of Securities Using Fair Value Hierarchy) (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
United States Commodity Index Fund [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	$309,955,163	$325,142,075
United States Commodity Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| Foreign [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,686,671	6,218,462
United States Commodity Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	7,620,452	4,571,285
United States Commodity Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	309,955,163	325,142,075
United States Commodity Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| Foreign [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,686,671	6,218,462
United States Commodity Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	7,620,452	4,571,285
United States Copper Index Fund [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,329,814	1,599,705
United States Copper Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	-95,737	130,163
United States Copper Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,329,814	1,599,705
United States Copper Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	-95,737	130,163
United States Agriculture Index Fund [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,469,793	1,499,678
United States Agriculture Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| Foreign [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	82,333	2,216
United States Agriculture Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	63,157	-46,749
United States Agriculture Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,469,793	1,499,678
United States Agriculture Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| Foreign [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	82,333	2,216
United States Agriculture Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	63,157	-46,749
United States Metals Index Fund [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,099,879	1,199,914
United States Metals Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| Foreign [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	-25,884	-12,610
United States Metals Index Fund [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	2,108	-33,683
United States Metals Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Short-Term Investments [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	1,099,879	1,199,914
United States Metals Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| Foreign [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	-25,884	-12,610
United States Metals Index Fund [Member] \| Fair Value, Inputs, Level 1 [Member] \| Exchange-Traded Futures Contracts [Member] \| United States [Member]	'	'
Schedule of Trading Securities and Other Trading Assets [Line Items]	'	'
Securities, fair value	$2,108	($33,683)

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments (Fair Value of Derivative Instrument held by Usci, Cper, Usag and Usmi) (Details) (Commodity Contracts [Member], Futures [Member], Assets [Member], USD $)	Mar. 31, 2014	Dec. 31, 2013
United States Commodity Index Fund [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not Accounted for as Hedging Instruments	$9,307,123	$10,789,747
United States Copper Index Fund [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not Accounted for as Hedging Instruments	-95,737	130,163
United States Agriculture Index Fund [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not Accounted for as Hedging Instruments	145,490	-44,533
United States Metals Index Fund [Member]	'	'
Derivatives, Fair Value [Line Items]	'	'
Derivatives not Accounted for as Hedging Instruments	($23,776)	($46,293)

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments (Effect of Derivative Instruments on Statements of Operations of Usci, Cper, Usag and Usmi) (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	$27,005,397	$2,939,726
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-1,495,984	-15,404,001
United States Commodity Index Fund [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	26,871,173	3,087,724
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-1,482,624	-15,109,247
United States Commodity Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Realized gain (loss) on closed positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	26,871,173	3,087,724
United States Commodity Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Change in unrealized gain (loss) on open positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-1,482,624	-15,109,247
United States Copper Index Fund [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	5,663	32,050
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-225,900	-201,738
United States Copper Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Realized gain (loss) on closed positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	5,663	32,050
United States Copper Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Change in unrealized gain (loss) on open positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	-225,900	-201,738
United States Agriculture Index Fund [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	160,134	-160,486
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	190,023	11,844
United States Agriculture Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Realized gain (loss) on closed positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	160,134	-160,486
United States Agriculture Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Change in unrealized gain (loss) on open positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	190,023	11,844
United States Metals Index Fund [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	-31,573	-19,562
United States Metals Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Realized gain (loss) on closed positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Realized gain (loss) on closed positions	-31,573	-19,562
United States Metals Index Fund [Member] \| Commodity Contracts [Member] \| Futures [Member] \| Change in unrealized gain (loss) on open positions [Member]	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'
Change in Unrealized Gain or (Loss) on Derivatives Recognized in Income	$22,517	($104,860)