Schedule of Investments (USD $)
Dec. 31, 2013
Dec. 31, 2012
Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long | United States | NYMEX RBOB Gasoline Futures RB February 2014 contracts, expiring January 2014
   
Number of contracts 486 [1]  
Unrealized Gain on Open Commodity Contracts $ 2,598,553 [1]  
% of Partners' Capital 4.57% [1]  
Open Cleared Swap and Futures Contracts | Open Futures Contracts, Long | United States | NYMEX RBOB Gasoline Futures RB February 2013 contracts, expiring January 2013
   
Number of contracts   554 [2]
Unrealized Gain on Open Commodity Contracts   2,608,343 [2]
% of Partners' Capital   4.06% [2]
Cash Equivalents
   
Market Value 48,493,330 51,194,826
% of Partners' Capital 85.23% 79.71%
Cash Equivalents | United States | US Treasury Securities | US Treasury Bill Securities
   
Principal Amount 10,000,000 3,700,000
Market Value 9,998,347 3,699,844
% of Partners' Capital 17.57% 5.76%
Cash Equivalents | United States | Money Market Funds
   
Market Value 38,494,983 47,494,982
% of Partners' Capital 67.66% 73.95%
Cash Equivalents | United States | Money Market Funds | Fidelity Institutional Government Portfolio, Class I
   
Principal Amount 16,063,515 18,063,514
Market Value 16,063,515 18,063,514
% of Partners' Capital 28.23% 28.12%
Cash Equivalents | United States | Money Market Funds | Goldman Sachs Financial Square Funds Government Fund, Class FS
   
Principal Amount 9,407,119 16,407,119
Market Value 9,407,119 16,407,119
% of Partners' Capital 16.54% 25.55%
Cash Equivalents | United States | Money Market Funds | Morgan Stanley Institutional Liquidity Fund, Government Portfolio
   
Principal Amount 13,024,349 13,024,349
Market Value $ 13,024,349 $ 13,024,349
% of Partners' Capital 22.89% 20.28%
[1] Collateral amounted to $2,053,484 on open futures contracts.
[2] Collateral amounted to $5,170,256 on open futures contracts