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Contracts and Agreements (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2015
 
 
For the Year Ended
December 31, 2014
 
 
For the Year Ended
December 31, 2013
 
Total commissions accrued to brokers
 
$
19,025
 
 
$
4,643
 
 
$
9,848
 
Total commissions as annualized percentage of average total net assets
 
 
0.03
%
 
 
0.01
%
 
 
0.01
%
Commissions accrued as a result of rebalancing
 
$
11,997
 
 
$
3,665
 
 
$
4,473
 
Percentage of commissions accrued as a result of rebalancing
 
 
63.06
%
 
 
78.94
%
 
 
45.42
%
Commissions accrued as a result of creation and redemption activity
 
$
7,028
 
 
$
978
 
 
$
5,375
 
Percentage of commissions accrued as a result of creation and redemption activity
 
 
36.94
%
 
 
21.06
%
 
 
54.58
%