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Condensed Schedule of Investments (United State [Member], USD $)
Mar. 31, 2014
Money Market Funds [Member]
  
Market Values $ 12,511,159
% of Partners' Capital 60.71%
Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] | Money Market Funds [Member]
  
Principal Amount 6,510,691
Market Values 6,510,691
% of Partners' Capital 31.59%
Wells Fargo Advantage Government Money Market Fund - Class I [Member] | Money Market Funds [Member]
  
Principal Amount 6,000,468
Market Values 6,000,468
% of Partners' Capital 29.12%
Cash Equivalents [Member]
  
Market Values 12,511,159
% of Partners' Capital 60.71%
Open Futures Contracts, Long [Member]
  
Number of Contracts 463 [1]
Unrealized Gain on Open Commodity Contracts 1,598,860 [1]
% of Partners' Capital 7.76% [1]
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG May 2014 contracts, expiring April 2014 [Member]
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts 135,810
% of Partners' Capital 0.66%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG June 2014 contracts, expiring May 2014 [Member]
  
Number of Contracts 38
Unrealized Gain on Open Commodity Contracts 130,390
% of Partners' Capital 0.63%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG July 2014 contracts, expiring June 2014 [Member]
  
Number of Contracts 38
Unrealized Gain on Open Commodity Contracts 175,020
% of Partners' Capital 0.85%
Open Futures Contracts, Long [Member] | NNYMEX Natural Gas Futures NG August 2014 contracts, expiring July 2014 [Member]
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts 186,770
% of Partners' Capital 0.91%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG September 2014 contracts, expiring August 2014 [Member]
  
Number of Contracts 38
Unrealized Gain on Open Commodity Contracts 241,310
% of Partners' Capital 1.17%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG October 2014 contracts, expiring September 2014 [Member]
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts 189,410
% of Partners' Capital 0.92%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG November 2014 contracts, expiring October 2014 [Member]
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts 147,800
% of Partners' Capital 0.72%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG December 2014 contracts, expiring November 2014 [Member]
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts 242,600
% of Partners' Capital 1.18%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]
  
Number of Contracts 38
Unrealized Gain on Open Commodity Contracts 88,840
% of Partners' Capital 0.43%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]
  
Number of Contracts 38
Unrealized Gain on Open Commodity Contracts 118,410
% of Partners' Capital 0.57%
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts (49,250)
% of Partners' Capital (0.24%)
Open Futures Contracts, Long [Member] | NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 (Member)
  
Number of Contracts 39
Unrealized Gain on Open Commodity Contracts $ (8,250)
% of Partners' Capital (0.04%)
[1] Collateral amounted to $308,837 on open futures contracts.