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CONTRACTS AND AGREEMENTS (Tables)
 12 Months Ended
Dec. 31, 2018
Contractors [Abstract]  
Brokerage Commissions
USL also incurs commissions to brokers for the purchase and sale of Oil Futures Contracts, Other Oil-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”)
 
 
 
For the Year Ended

December 31, 2018
 
 
For the Year Ended

December 31, 2017
 
 
For the Year Ended

December 31, 2016
 
Total commissions accrued to brokers
 
$
6,045
 
 
$
17,897
 
 
$
22,207
 
Total commissions as annualized percentage of average total net assets
 
 
0.01
%
 
 
0.02
%
 
 
0.02
%
Commissions accrued as a result of rebalancing
 
$
4,961
 
 
$
13,735
 
 
$
17,872
 
Percentage of commissions accrued as a result of rebalancing
 
 
82.07
%
 
 
76.74
%
 
 
80.48
%
Commissions accrued as a result of creation and redemption activity
 
$
1,084
 
 
$
4,162
 
 
$
4,335
 
Percentage of commissions accrued as a result of creation and redemption activity
 
 
17.93
%
 
 
23.26
%
 
 
19.52
%