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Assets and Condensed Schedule of Investments by Class of Units - Securities Owned by Class of Units (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Securities owned    
Investments Owned - broker trading accounts, cost $ 0 $ 12,393,731
Investments Owned, cost 111,958,454 116,001,074
Investments owned - broker trading accounts, fair value   12,395,634
Investments Owned, Fair Value $ 116,297,654 $ 112,187,759
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 82,242,670 $ 89,200,000
Investments Owned, Fair Value $ 82,472,451 $ 89,383,625
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 14,599,766 $ 12,077,022
Investments Owned, Fair Value $ 14,643,428 $ 12,116,846 [1]
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06% [1]
Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 19,158,638 $ 10,681,432
Investments Owned, Fair Value $ 19,181,775 $ 10,687,288 [1]
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58% [1]
U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value [2]   $ 12,400,000
Investments Owned, Rate of Return   0.10%
Investments Owned - broker trading accounts, cost   $ 12,393,731
Investments Owned, Fair Value [2]   $ 12,395,634
Percent of Partners' Capital (Net Asset Value) [2]   4.15%
Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 38,500,000 $ 20,000,000
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 38,605,179 $ 20,069,167
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 43,735,000 $ 66,700,000
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 43,867,272 $ 66,813,621
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 2,500,000
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 2,500,837
Percent of Partners' Capital (Net Asset Value)   0.84%
Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value [1]   $ 1,542,000
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value [1]   $ 1,553,227
Percent of Partners' Capital (Net Asset Value) [1]   0.52%
U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value [1]   $ 10,283,000
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value [1]   $ 10,563,619
Percent of Partners' Capital (Net Asset Value) [1]   3.54%
Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value [1] $ 4,010,000 $ 2,584,000
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value [1] $ 4,008,509 $ 2,580,625
Percent of Partners' Capital (Net Asset Value) [1] 1.87% 0.86%
U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value [1]   $ 8,110,000
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value $ 15,173,266 $ 8,106,663 [1]
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72% [1]
Class A    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 643,941
Investments Owned, cost $ 5,969,758 5,817,022
Investments owned - broker trading accounts, fair value   644,040
Investments Owned, Fair Value $ 5,985,021 $ 5,828,936
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Class A | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 4,232,451 $ 4,634,561
Investments Owned, Fair Value $ 4,244,276 $ 4,644,102
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Class A | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 751,347 $ 627,486
Investments Owned, Fair Value $ 753,594 $ 629,555
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Class A | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 985,960 $ 554,975
Investments Owned, Fair Value $ 987,151 $ 555,279
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58%
Class A | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 644,266
Investments Owned, Rate of Return   0.10%
Investments Owned, cost   $ 643,941
Investments owned - broker trading accounts, fair value   $ 644,040
Percent of Partners' Capital (Net Asset Value)   4.15%
Class A | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 1,981,324 $ 1,039,139
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 1,986,737 $ 1,042,733
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Class A | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 2,250,732 $ 3,465,530
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 2,257,539 $ 3,471,433
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Class A | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 129,892
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 129,936
Percent of Partners' Capital (Net Asset Value)   0.84%
Class A | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 80,118
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 80,701
Percent of Partners' Capital (Net Asset Value)   0.52%
Class A | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 534,274
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 548,854
Percent of Partners' Capital (Net Asset Value)   3.54%
Class A | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 206,366 $ 134,257
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 206,290 $ 134,081
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Class A | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 421,371
Investments Owned, Rate of Return Range Minimum 0.40% 0.30%
Investments Owned, Rate of Return Range Maximum 0.90% 0.40%
Investments Owned, Fair Value $ 780,861 $ 421,198
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72%
Class A | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 205,852  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 205,817  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Class A | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 102,926  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 113,817  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Class A | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 632,171  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 639,777  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Class A | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 575,356  
Investments Owned, Fair Value $ 575,044  
Percent of Partners' Capital (Net Asset Value) 5.23%  
Class B    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 6,722,434
Investments Owned, cost $ 65,571,910 60,726,934
Investments owned - broker trading accounts, fair value   6,723,466
Investments Owned, Fair Value $ 65,739,557 $ 60,851,309
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Class B | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 46,489,302 $ 48,382,612
Investments Owned, Fair Value $ 46,619,190 $ 48,482,212
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Class B | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 8,252,808 $ 6,550,649
Investments Owned, Fair Value $ 8,277,488 $ 6,572,249
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Class B | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 10,829,800 $ 5,793,672
Investments Owned, Fair Value $ 10,842,879 $ 5,796,848
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58%
Class B | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 6,725,834
Investments Owned, Rate of Return   0.10%
Investments Owned, cost   $ 6,722,434
Investments owned - broker trading accounts, fair value   $ 6,723,466
Percent of Partners' Capital (Net Asset Value)   4.15%
Class B | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 21,762,889 $ 10,848,119
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 21,822,344 $ 10,885,636
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Class B | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 24,722,077 $ 36,178,478
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 24,796,846 $ 36,240,107
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Class B | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 1,356,015
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 1,356,469
Percent of Partners' Capital (Net Asset Value)   0.84%
Class B | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 836,390
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 842,479
Percent of Partners' Capital (Net Asset Value)   0.52%
Class B | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 5,577,561
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 5,729,770
Percent of Partners' Capital (Net Asset Value)   3.54%
Class B | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 2,266,732 $ 1,401,577
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 2,265,889 $ 1,399,746
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Class B | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 4,398,912
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value $ 8,576,990 $ 4,397,102
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72%
Class B | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 2,261,079  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 2,260,695  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Class B | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 1,130,540  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 1,250,170  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Class B | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 6,943,775  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 7,027,318  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Class B | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 6,319,717  
Investments Owned, Rate of Return Range Minimum 0.40%  
Investments Owned, Rate of Return Range Maximum 0.90%  
Investments Owned, Fair Value $ 6,316,295  
Percent of Partners' Capital (Net Asset Value) 5.23%  
Legacy 1 Class    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 109,783
Investments Owned, cost $ 1,039,644 991,726
Investments owned - broker trading accounts, fair value   109,800
Investments Owned, Fair Value $ 1,042,301 $ 993,756
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Legacy 1 Class | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 737,089 $ 790,132
Investments Owned, Fair Value $ 739,148 $ 791,758
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Legacy 1 Class | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 130,848 $ 106,978
Investments Owned, Fair Value $ 131,239 $ 107,330
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Legacy 1 Class | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 171,707 $ 94,616
Investments Owned, Fair Value $ 135,988 $ 94,668
Percent of Partners' Capital (Net Asset Value) 7.10% 3.58%
Legacy 1 Class | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 109,839
Investments Owned, Rate of Return   0.10%
Investments Owned, cost   $ 109,783
Investments owned - broker trading accounts, fair value   $ 109,800
Percent of Partners' Capital (Net Asset Value)   4.15%
Legacy 1 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 345,051 $ 177,160
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 345,994 $ 177,772
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Legacy 1 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 391,969 $ 590,827
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 393,154 $ 591,834
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Legacy 1 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 22,145
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 22,152
Percent of Partners' Capital (Net Asset Value)   0.84%
Legacy 1 Class | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 13,659
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 13,758
Percent of Partners' Capital (Net Asset Value)   0.52%
Legacy 1 Class | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 91,087
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 93,572
Percent of Partners' Capital (Net Asset Value)   3.54%
Legacy 1 Class | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 35,939 $ 22,889
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 35,926 $ 22,859
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Legacy 1 Class | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 71,838
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value   $ 71,809
Percent of Partners' Capital (Net Asset Value)   2.72%
Legacy 1 Class | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 35,849  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 35,843  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Legacy 1 Class | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 17,925  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 19,821  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Legacy 1 Class | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 110,094  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 111,418  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Legacy 1 Class | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 100,199  
Investments Owned, Rate of Return Range Minimum 0.40%  
Investments Owned, Rate of Return Range Maximum 0.90%  
Investments Owned, Fair Value $ 100,145  
Percent of Partners' Capital (Net Asset Value) 5.23%  
Legacy 2 Class    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 37,730
Investments Owned, cost $ 347,456 340,831
Investments owned - broker trading accounts, fair value   37,735
Investments Owned, Fair Value $ 348,345 $ 341,528
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Legacy 2 Class | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 246,340 $ 271,548
Investments Owned, Fair Value $ 247,029 $ 272,107
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Legacy 2 Class | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 43,730 $ 36,766
Investments Owned, Fair Value $ 43,861 $ 36,886
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Legacy 2 Class | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 57,386 $ 32,517
Investments Owned, Fair Value $ 57,455 $ 32,535
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58%
Legacy 2 Class | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 37,749
Investments Owned, Rate of Return   0.10%
Investments Owned - broker trading accounts, cost   $ 37,730
Investments owned - broker trading accounts, fair value   $ 37,735
Percent of Partners' Capital (Net Asset Value)   4.15%
Legacy 2 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 115,319 $ 60,885
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 115,634 $ 61,096
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Legacy 2 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 130,999 $ 203,052
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 131,395 $ 203,398
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Legacy 2 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 7,611
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 7,613
Percent of Partners' Capital (Net Asset Value)   0.84%
Legacy 2 Class | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 4,694
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 4,728
Percent of Partners' Capital (Net Asset Value)   0.52%
Legacy 2 Class | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 31,304
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 32,158
Percent of Partners' Capital (Net Asset Value)   3.54%
Legacy 2 Class | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 12,011 $ 7,866
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 12,007 $ 7,856
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Legacy 2 Class | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 24,689
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value $ 45,448 $ 24,679
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72%
Legacy 2 Class | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 11,981  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 11,979  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Legacy 2 Class | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 5,991  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 6,624  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Legacy 2 Class | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 36,794  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 37,237  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Legacy 2 Class | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 33,487  
Investments Owned, Rate of Return Range Minimum 0.40%  
Investments Owned, Rate of Return Range Maximum 0.90%  
Investments Owned, Fair Value $ 33,469  
Percent of Partners' Capital (Net Asset Value) 5.23%  
Global 1 Class    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 401,108
Investments Owned, cost $ 10,596,334 3,623,402
Investments owned - broker trading accounts, fair value   401,170
Investments Owned, Fair Value $ 10,623,425 $ 3,630,823
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Global 1 Class | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 7,512,610 $ 2,886,852
Investments Owned, Fair Value $ 7,533,599 $ 2,892,795
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Global 1 Class | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 1,333,643 $ 390,858
Investments Owned, Fair Value $ 1,337,631 $ 392,147
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Global 1 Class | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 1,750,081 $ 345,692
Investments Owned, Fair Value $ 1,752,195 $ 345,881
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58%
Global 1 Class | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 401,311
Investments Owned, Rate of Return   0.10%
Investments Owned, cost   $ 401,108
Investments owned - broker trading accounts, fair value   $ 401,170
Percent of Partners' Capital (Net Asset Value)   4.15%
Global 1 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 3,516,854 $ 647,276
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 3,526,462 $ 649,515
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Global 1 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 3,995,055 $ 2,158,666
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 4,007,137 $ 2,162,343
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Global 1 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 80,910
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 80,937
Percent of Partners' Capital (Net Asset Value)   0.84%
Global 1 Class | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 49,905
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 50,268
Percent of Partners' Capital (Net Asset Value)   0.52%
Global 1 Class | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 332,797
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 341,879
Percent of Partners' Capital (Net Asset Value)   3.54%
Global 1 Class | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 366,301 $ 83,628
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 366,165 $ 83,519
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Global 1 Class | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 262,470
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value $ 1,386,030 $ 262,362
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72%
Global 1 Class | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 365,387  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 365,325  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Global 1 Class | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 182,694  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 202,026  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Global 1 Class | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 1,122,105  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 1,135,605  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Global 1 Class | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 1,021,258  
Investments Owned, Rate of Return Range Minimum 0.40%  
Investments Owned, Rate of Return Range Maximum 0.90%  
Investments Owned, Fair Value $ 1,020,705  
Percent of Partners' Capital (Net Asset Value) 5.23%  
Global 2 Class    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 243,500
Investments Owned, cost $ 2,102,059 2,199,646
Investments owned - broker trading accounts, fair value   243,537
Investments Owned, Fair Value $ 2,107,434 $ 2,204,153
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Global 2 Class | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 1,490,322 $ 1,752,511
Investments Owned, Fair Value $ 1,494,487 $ 1,756,120
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Global 2 Class | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 264,563 $ 237,277
Investments Owned, Fair Value $ 265,354 $ 238,059
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Global 2 Class | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 347,174 $ 209,858
Investments Owned, Fair Value $ 347,593 $ 209,974
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58%
Global 2 Class | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 243,623
Investments Owned, Rate of Return   0.10%
Investments Owned, cost   $ 243,500
Investments owned - broker trading accounts, fair value   $ 243,537
Percent of Partners' Capital (Net Asset Value)   4.15%
Global 2 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 697,660 $ 392,940
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 699,566 $ 394,299
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Global 2 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 792,524 $ 1,310,454
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 794,921 $ 1,312,687
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Global 2 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 49,117
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 49,134
Percent of Partners' Capital (Net Asset Value)   0.84%
Global 2 Class | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 30,296
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 30,516
Percent of Partners' Capital (Net Asset Value)   0.52%
Global 2 Class | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 202,030
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 207,543
Percent of Partners' Capital (Net Asset Value)   3.54%
Global 2 Class | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 72,665 $ 50,768
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 72,638 $ 50,702
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Global 2 Class | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 159,337
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value $ 274,955 $ 159,272
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72%
Global 2 Class | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 72,484  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 72,472  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Global 2 Class | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 36,242  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 40,077  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Global 2 Class | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 222,599  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 225,277  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Global 2 Class | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 202,593  
Investments Owned, Rate of Return Range Minimum 0.40%  
Investments Owned, Rate of Return Range Maximum 0.90%  
Investments Owned, Fair Value $ 202,483  
Percent of Partners' Capital (Net Asset Value) 5.23%  
Global 3 Class    
Securities owned    
Investments Owned - broker trading accounts, cost   $ 4,235,235
Investments Owned, cost $ 30,373,913 38,258,894
Investments owned - broker trading accounts, fair value   4,235,886
Investments Owned, Fair Value $ 30,451,571 $ 38,337,254
Percent of Partners' Capital (Net Asset Value) 54.41% 37.58%
Global 3 Class | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, cost $ 21,534,556 $ 30,481,784
Investments Owned, Fair Value $ 21,594,722 $ 30,544,531
Percent of Partners' Capital (Net Asset Value) 38.59% 29.94%
Global 3 Class | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, cost $ 3,822,827 $ 4,127,008
Investments Owned, Fair Value $ 3,834,261 $ 4,140,620
Percent of Partners' Capital (Net Asset Value) 6.85% 4.06%
Global 3 Class | Securities owned | Commercial paper    
Securities owned    
Investments Owned, cost $ 5,016,530 $ 3,650,102
Investments Owned, Fair Value $ 5,022,588 $ 3,652,103
Percent of Partners' Capital (Net Asset Value) 8.97% 3.58%
Global 3 Class | U.S. Treasury Bills | Securities in broker trading accounts | U.S. Government securities    
Securities owned    
Investments Owned, Face Value   $ 4,237,378
Investments Owned, Rate of Return   0.10%
Investments Owned, cost   $ 4,235,235
Investments owned - broker trading accounts, fair value   $ 4,235,886
Percent of Partners' Capital (Net Asset Value)   4.15%
Global 3 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 10,080,903 $ 6,834,481
Investments Owned, Rate of Return   1.10%
Investments Owned, Rate of Return Range Minimum 1.10%  
Investments Owned, Rate of Return Range Maximum 1.40%  
Investments Owned, Fair Value $ 10,108,442 $ 6,858,116
Percent of Partners' Capital (Net Asset Value) 18.06% 6.72%
Global 3 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value $ 11,451,644 $ 22,792,993
Investments Owned, Rate of Return Range Minimum 1.10% 1.00%
Investments Owned, Rate of Return Range Maximum 1.50% 1.30%
Investments Owned, Fair Value $ 11,486,280 $ 22,831,819
Percent of Partners' Capital (Net Asset Value) 20.53% 22.38%
Global 3 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises    
Securities owned    
Investments Owned, Face Value   $ 854,310
Investments Owned, Rate of Return   1.30%
Investments Owned, Fair Value   $ 854,596
Percent of Partners' Capital (Net Asset Value)   0.84%
Global 3 Class | Foreign corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 526,938
Investments Owned, Rate of Return   0.80%
Investments Owned, Fair Value   $ 530,777
Percent of Partners' Capital (Net Asset Value)   0.52%
Global 3 Class | U.S. corporate bonds | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value   $ 3,513,947
Investments Owned, Rate of Return Range Minimum   0.70%
Investments Owned, Rate of Return Range Maximum   1.10%
Investments Owned, Fair Value   $ 3,609,843
Percent of Partners' Capital (Net Asset Value)   3.54%
Global 3 Class | Foreign commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 1,049,986 $ 883,015
Investments Owned, Rate of Return   0.50%
Investments Owned, Rate of Return Range Minimum 0.50%  
Investments Owned, Rate of Return Range Maximum 0.80%  
Investments Owned, Fair Value $ 1,049,594 $ 881,862
Percent of Partners' Capital (Net Asset Value) 1.87% 0.86%
Global 3 Class | U.S. commercial paper | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value   $ 2,771,383
Investments Owned, Rate of Return Range Minimum   0.30%
Investments Owned, Rate of Return Range Maximum   0.40%
Investments Owned, Fair Value $ 3,972,994 $ 2,770,241
Percent of Partners' Capital (Net Asset Value) 7.10% 2.72%
Global 3 Class | National Grid PLC | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 1,047,368  
Investments Owned, Rate of Return 0.50%  
Investments Owned, Fair Value $ 1,047,189  
Percent of Partners' Capital (Net Asset Value) 1.87%  
Global 3 Class | Wachovia Corp | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 523,682  
Investments Owned, Rate of Return 1.70%  
Investments Owned, Fair Value $ 579,099  
Percent of Partners' Capital (Net Asset Value) 1.03%  
Global 3 Class | Other | Securities owned | Corporate Bonds    
Securities owned    
Investments Owned, Face Value $ 3,216,462  
Investments Owned, Rate of Return Range Minimum 1.20%  
Investments Owned, Rate of Return Range Maximum 1.80%  
Investments Owned, Fair Value $ 3,255,162  
Percent of Partners' Capital (Net Asset Value) 5.82%  
Global 3 Class | Other | Securities owned | Commercial paper    
Securities owned    
Investments Owned, Face Value $ 2,927,390  
Investments Owned, Rate of Return Range Minimum 0.40%  
Investments Owned, Rate of Return Range Maximum 0.90%  
Investments Owned, Fair Value $ 2,925,805  
Percent of Partners' Capital (Net Asset Value) 5.23%  
[1] No individual position constituted greater than 1 percent of partners' capital (net asset value).
[2] Pledged as collateral for the trading of futures and forward contracts.