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Assets and Condensed Schedule of Investments by Class of Units - Securities Owned by Class of Units (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Jul. 31, 2017
Dec. 31, 2016
Securities owned        
Investments Owned, Cost $ 70,506,731 $ 74,547,232   $ 87,212,372
Investments Owned, Fair Value 69,613,814 74,642,951   87,511,963
Securities owned        
Securities owned        
Investments Owned, Cost 70,506,731 74,547,232   87,212,372
Investments Owned, Fair Value $ 69,613,814 $ 74,642,951   $ 87,511,963
Percent of Partners' Capital (Net Asset Value) 70.35% 65.77%   52.92%
Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost $ 59,497,750 $ 59,497,750   $ 68,999,520
Investments Owned, Fair Value $ 59,672,553 $ 59,683,241   $ 69,209,493
Percent of Partners' Capital (Net Asset Value) 60.31% 52.59%   41.85%
Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value $ 38,000,000 $ 38,000,000   $ 47,500,000
Investments Owned, Rate of Return Range Minimum 1.10% 1.10%   1.10%
Investments Owned, Rate of Return Range Maximum 1.30% 1.30%   1.30%
Investments Owned, Fair Value $ 38,105,265 $ 38,103,115   $ 47,629,368
Percent of Partners' Capital (Net Asset Value) 38.51% 33.58%   28.80%
Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value $ 19,000,000 $ 19,000,000   $ 19,000,000
Investments Owned, Rate of Return Range Minimum 1.10% 1.10%   1.10%
Investments Owned, Rate of Return Range Maximum 1.50% 1.50%   1.50%
Investments Owned, Fair Value $ 19,061,588 $ 19,067,301   $ 19,067,300
Percent of Partners' Capital (Net Asset Value) 19.27% 16.80%   11.53%
Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value $ 2,500,000 $ 2,500,000   $ 2,500,000
Investments Owned, Rate of Return 1.10% 1.10%   1.10%
Investments Owned, Fair Value $ 2,505,700 $ 2,512,825   $ 2,512,825
Percent of Partners' Capital (Net Asset Value) 2.53% 2.21%   1.52%
U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 4,040,501   $ 11,093,510
Investments Owned, Fair Value   $ 4,066,723   $ 11,158,232
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 1,900,000
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 1,932,728
Percent of Partners' Capital (Net Asset Value)       1.17%
American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 2,000,000   $ 2,000,000
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 2,012,166   $ 2,013,468
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 1,840,000
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 1,835,800
Percent of Partners' Capital (Net Asset Value)       1.11%
GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value [1]       $ 1,905,000
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value [1]       $ 1,910,867
Percent of Partners' Capital (Net Asset Value) [1]       1.16%
Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 2,000,000   $ 2,000,000
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 2,054,557   $ 2,133,790
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value [1]       $ 1,325,000
Investments Owned, Rate of Return [1]       1.50%
Investments Owned, Fair Value [1]       $ 1,331,579
Percent of Partners' Capital (Net Asset Value) [1]       0.80%
U.S. Mutual Fund | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Cost     $ 7,300,000  
Investments Owned, Fair Value   $ 7,683,587    
U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   689,730    
Investments Owned, Cost   $ 7,779,984    
Investments Owned, Fair Value   $ 7,683,587    
Percent of Partners' Capital (Net Asset Value)   6.77%    
U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares [2]   110,000    
Investments Owned, Cost $ 3,228,997 $ 3,228,997 [2]    
Investments Owned, Fair Value $ 3,209,500 $ 3,209,400 [2]    
Percent of Partners' Capital (Net Asset Value) 3.24% 2.83% [2]    
U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 7,119,342
Investments Owned, Fair Value       $ 7,144,238
Percent of Partners' Capital (Net Asset Value)       4.32%
Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 4,000,000
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 3,994,645
Percent of Partners' Capital (Net Asset Value)       2.42%
Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value [1]       $ 3,150,000
Investments Owned, Rate of Return Range Minimum [1]       0.90%
Investments Owned, Rate of Return Range Maximum [1]       1.40%
Investments Owned, Fair Value [1]       $ 3,149,593
Percent of Partners' Capital (Net Asset Value) [1]       1.90%
Class A        
Securities owned        
Investments Owned, Cost   $ 4,916,553   $ 5,048,054
Investments Owned, Fair Value   4,922,866   5,065,395
Class A | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 4,922,866   $ 5,065,395
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Class A | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 3,924,007   $ 3,993,852
Investments Owned, Fair Value   $ 3,936,240   $ 4,006,006
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Class A | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 2,506,183   $ 2,749,410
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 2,512,984   $ 2,756,898
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Class A | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 1,253,092   $ 1,099,764
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 1,257,530   $ 1,103,660
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Class A | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 164,880   $ 144,706
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 165,726   $ 145,448
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Class A | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 266,480   $ 642,118
Investments Owned, Fair Value   $ 268,210   $ 645,864
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Class A | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 109,976
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 111,871
Percent of Partners' Capital (Net Asset Value)       1.17%
Class A | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 131,904   $ 115,765
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 132,707   $ 116,544
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Class A | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 106,503
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 106,260
Percent of Partners' Capital (Net Asset Value)       1.11%
Class A | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 110,266
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 110,605
Percent of Partners' Capital (Net Asset Value)       1.16%
Class A | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 131,904   $ 115,765
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 135,503   $ 123,509
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Class A | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 76,694
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 77,075
Percent of Partners' Capital (Net Asset Value)       0.80%
Class A | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   45,489    
Investments Owned, Cost   $ 513,107    
Investments Owned, Fair Value   $ 506,749    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Class A | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   7,255    
Investments Owned, Cost   $ 212,959    
Investments Owned, Fair Value   $ 211,667    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Class A | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 412,084
Investments Owned, Fair Value       $ 413,525
Percent of Partners' Capital (Net Asset Value)       4.32%
Class A | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 231,529
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 231,219
Percent of Partners' Capital (Net Asset Value)       2.42%
Class A | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 182,329
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 182,306
Percent of Partners' Capital (Net Asset Value)       1.90%
Class B        
Securities owned        
Investments Owned, Cost   $ 47,587,712   $ 52,279,208
Investments Owned, Fair Value   47,648,814   52,458,798
Class B | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 47,648,814   $ 52,458,798
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Class B | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 37,980,777   $ 41,361,566
Investments Owned, Fair Value   $ 38,099,186   $ 41,487,434
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Class B | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 24,257,548   $ 28,473,740
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 24,323,372   $ 28,551,289
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Class B | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 12,128,774   $ 11,389,496
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 12,171,736   $ 11,429,839
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Class B | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 1,595,891   $ 1,498,618
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 1,604,078   $ 1,506,306
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Class B | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 2,579,280   $ 6,649,973
Investments Owned, Fair Value   $ 2,596,019   $ 6,688,770
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Class B | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 1,138,950
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 1,158,568
Percent of Partners' Capital (Net Asset Value)       1.17%
Class B | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 1,276,713   $ 1,198,894
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 1,284,479   $ 1,206,968
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Class B | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 1,102,983
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 1,100,465
Percent of Partners' Capital (Net Asset Value)       1.11%
Class B | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 1,141,947
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 1,145,464
Percent of Partners' Capital (Net Asset Value)       1.16%
Class B | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 1,276,713   $ 1,198,894
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 1,311,540   $ 1,279,094
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Class B | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 794,267
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 798,211
Percent of Partners' Capital (Net Asset Value)       0.80%
Class B | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   440,294    
Investments Owned, Cost   $ 4,966,404    
Investments Owned, Fair Value   $ 4,904,868    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Class B | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   70,219    
Investments Owned, Cost   $ 2,061,251    
Investments Owned, Fair Value   $ 2,048,741    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Class B | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 4,267,669
Investments Owned, Fair Value       $ 4,282,594
Percent of Partners' Capital (Net Asset Value)       4.32%
Class B | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 2,397,789
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 2,394,579
Percent of Partners' Capital (Net Asset Value)       2.42%
Class B | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 1,888,259
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 1,888,015
Percent of Partners' Capital (Net Asset Value)       1.90%
Legacy 1 Class        
Securities owned        
Investments Owned, Cost   $ 747,488   $ 679,305
Investments Owned, Fair Value   748,449   681,639
Legacy 1 Class | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 748,449   $ 681,639
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Legacy 1 Class | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 596,587   $ 537,444
Investments Owned, Fair Value   $ 598,447   $ 539,080
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Legacy 1 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 381,028   $ 369,982
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 382,062   $ 370,990
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Legacy 1 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 190,514   $ 147,993
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 191,189   $ 148,517
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Legacy 1 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 25,068   $ 19,473
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 25,196   $ 19,573
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Legacy 1 Class | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 40,514   $ 86,408
Investments Owned, Fair Value   $ 40,777   $ 86,912
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Legacy 1 Class | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 14,799
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 15,054
Percent of Partners' Capital (Net Asset Value)       1.17%
Legacy 1 Class | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 20,054   $ 15,578
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 20,176   $ 15,683
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Legacy 1 Class | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 14,332
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 14,299
Percent of Partners' Capital (Net Asset Value)       1.11%
Legacy 1 Class | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 14,838
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 14,884
Percent of Partners' Capital (Net Asset Value)       1.16%
Legacy 1 Class | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 20,054   $ 15,578
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 20,601   $ 16,620
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Legacy 1 Class | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 10,321
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 10,372
Percent of Partners' Capital (Net Asset Value)       0.80%
Legacy 1 Class | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   6,916    
Investments Owned, Cost   $ 78,010    
Investments Owned, Fair Value   $ 77,044    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Legacy 1 Class | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   1,103    
Investments Owned, Cost   $ 32,377    
Investments Owned, Fair Value   $ 32,181    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Legacy 1 Class | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 55,453
Investments Owned, Fair Value       $ 55,647
Percent of Partners' Capital (Net Asset Value)       4.32%
Legacy 1 Class | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 31,156
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 31,115
Percent of Partners' Capital (Net Asset Value)       2.42%
Legacy 1 Class | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 24,536
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 24,532
Percent of Partners' Capital (Net Asset Value)       1.90%
Legacy 2 Class        
Securities owned        
Investments Owned, Cost   $ 260,501   $ 247,329
Investments Owned, Fair Value   260,835   248,178
Legacy 2 Class | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 260,835   $ 248,178
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Legacy 2 Class | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 207,911   $ 195,678
Investments Owned, Fair Value   $ 208,559   $ 196,274
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Legacy 2 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 132,788   $ 134,707
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 133,149   $ 135,074
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Legacy 2 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 66,394   $ 53,883
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 66,629   $ 54,074
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Legacy 2 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 8,736   $ 7,090
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 8,781   $ 7,126
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Legacy 2 Class | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 14,119   $ 31,461
Investments Owned, Fair Value   $ 14,211   $ 31,643
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Legacy 2 Class | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 5,388
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 5,481
Percent of Partners' Capital (Net Asset Value)       1.17%
Legacy 2 Class | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 6,989   $ 5,672
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 7,031   $ 5,710
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Legacy 2 Class | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 5,218
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 5,206
Percent of Partners' Capital (Net Asset Value)       1.11%
Legacy 2 Class | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 5,402
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 5,419
Percent of Partners' Capital (Net Asset Value)       1.16%
Legacy 2 Class | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 6,989   $ 5,672
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 7,180   $ 6,051
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Legacy 2 Class | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 3,758
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 3,776
Percent of Partners' Capital (Net Asset Value)       0.80%
Legacy 2 Class | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   2,410    
Investments Owned, Cost   $ 27,187    
Investments Owned, Fair Value   $ 26,850    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Legacy 2 Class | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   384    
Investments Owned, Cost   $ 11,284    
Investments Owned, Fair Value   $ 11,215    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Legacy 2 Class | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 20,190
Investments Owned, Fair Value       $ 20,261
Percent of Partners' Capital (Net Asset Value)       4.32%
Legacy 2 Class | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 11,344
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 11,329
Percent of Partners' Capital (Net Asset Value)       2.42%
Legacy 2 Class | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 8,933
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 8,932
Percent of Partners' Capital (Net Asset Value)       1.90%
Global 1 Class        
Securities owned        
Investments Owned, Cost   $ 16,804,927   $ 17,856,749
Investments Owned, Fair Value   16,826,506   17,918,088
Global 1 Class | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 16,826,506   $ 17,918,088
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Global 1 Class | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 13,412,374   $ 14,127,664
Investments Owned, Fair Value   $ 13,454,189   $ 14,170,655
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Global 1 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 8,566,210   $ 9,725,633
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 8,589,455   $ 9,752,121
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Global 1 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 4,283,105   $ 3,890,253
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 4,298,276   $ 3,904,033
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Global 1 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 563,566   $ 511,875
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 566,458   $ 514,501
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Global 1 Class | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 910,836   $ 2,271,398
Investments Owned, Fair Value   $ 916,748   $ 2,284,649
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Global 1 Class | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 389,025
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 395,726
Percent of Partners' Capital (Net Asset Value)       1.17%
Global 1 Class | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 450,853   $ 409,500
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 453,596   $ 412,258
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Global 1 Class | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 376,740
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 375,880
Percent of Partners' Capital (Net Asset Value)       1.11%
Global 1 Class | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 390,049
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 391,250
Percent of Partners' Capital (Net Asset Value)       1.16%
Global 1 Class | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 450,853   $ 409,500
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 463,152   $ 436,894
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Global 1 Class | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 271,294
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 272,641
Percent of Partners' Capital (Net Asset Value)       0.80%
Global 1 Class | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   155,483    
Investments Owned, Cost   $ 1,753,815    
Investments Owned, Fair Value   $ 1,732,085    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Global 1 Class | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   24,797    
Investments Owned, Cost   $ 727,902    
Investments Owned, Fair Value   $ 723,484    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Global 1 Class | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 1,457,687
Investments Owned, Fair Value       $ 1,462,784
Percent of Partners' Capital (Net Asset Value)       4.32%
Global 1 Class | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 819,001
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 817,904
Percent of Partners' Capital (Net Asset Value)       2.42%
Global 1 Class | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 644,963
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 644,880
Percent of Partners' Capital (Net Asset Value)       1.90%
Global 2 Class        
Securities owned        
Investments Owned, Cost   $ 699,443   $ 1,083,801
Investments Owned, Fair Value   700,341   1,087,524
Global 2 Class | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 700,341   $ 1,087,524
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Global 2 Class | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 558,241   $ 857,467
Investments Owned, Fair Value   $ 559,981   $ 860,076
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Global 2 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 356,537   $ 590,290
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 357,504   $ 591,897
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Global 2 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 178,268   $ 236,116
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 178,900   $ 236,952
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Global 2 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 23,456   $ 31,068
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 23,577   $ 31,227
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Global 2 Class | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 37,910   $ 137,861
Investments Owned, Fair Value   $ 38,156   $ 138,666
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Global 2 Class | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 23,612
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 24,018
Percent of Partners' Capital (Net Asset Value)       1.17%
Global 2 Class | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 18,765   $ 24,854
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 18,879   $ 25,022
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Global 2 Class | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 22,866
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 22,814
Percent of Partners' Capital (Net Asset Value)       1.11%
Global 2 Class | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 23,674
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 23,747
Percent of Partners' Capital (Net Asset Value)       1.16%
Global 2 Class | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 18,765   $ 24,854
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 19,277   $ 26,517
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Global 2 Class | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 16,466
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 16,548
Percent of Partners' Capital (Net Asset Value)       0.80%
Global 2 Class | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   6,471    
Investments Owned, Cost   $ 72,996    
Investments Owned, Fair Value   $ 72,092    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Global 2 Class | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   1,032    
Investments Owned, Cost   $ 30,296    
Investments Owned, Fair Value   $ 30,112    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Global 2 Class | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 88,473
Investments Owned, Fair Value       $ 88,782
Percent of Partners' Capital (Net Asset Value)       4.32%
Global 2 Class | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 49,709
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 49,642
Percent of Partners' Capital (Net Asset Value)       2.42%
Global 2 Class | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 39,146
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 39,140
Percent of Partners' Capital (Net Asset Value)       1.90%
Global 3 Class        
Securities owned        
Investments Owned, Cost   $ 3,530,608   $ 10,017,926
Investments Owned, Fair Value   3,535,140   10,052,341
Global 3 Class | Securities owned        
Securities owned        
Investments Owned, Fair Value   $ 3,535,140   $ 10,052,341
Percent of Partners' Capital (Net Asset Value)   65.77%   52.92%
Global 3 Class | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Cost   $ 2,817,853   $ 7,925,849
Investments Owned, Fair Value   $ 2,826,639   $ 7,949,968
Percent of Partners' Capital (Net Asset Value)   52.59%   41.85%
Global 3 Class | Federal Farm Credit Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 1,799,706   $ 5,456,238
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.30%   1.30%
Investments Owned, Fair Value   $ 1,804,589   $ 5,471,099
Percent of Partners' Capital (Net Asset Value)   33.58%   28.80%
Global 3 Class | Federal Home Loan Banks | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 899,853   $ 2,182,495
Investments Owned, Rate of Return Range Minimum   1.10%   1.10%
Investments Owned, Rate of Return Range Maximum   1.50%   1.50%
Investments Owned, Fair Value   $ 903,041   $ 2,190,225
Percent of Partners' Capital (Net Asset Value)   16.80%   11.53%
Global 3 Class | Federal Agricultural Mortgage Corp. | Securities owned | U.S. Government-sponsored enterprises        
Securities owned        
Investments Owned, Face Value   $ 118,403   $ 287,170
Investments Owned, Rate of Return   1.10%   1.10%
Investments Owned, Fair Value   $ 119,009   $ 288,644
Percent of Partners' Capital (Net Asset Value)   2.21%   1.52%
Global 3 Class | U.S. Corporate bonds | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Cost   $ 191,362   $ 1,274,291
Investments Owned, Fair Value   $ 192,602   $ 1,281,728
Percent of Partners' Capital (Net Asset Value)   3.58%   6.75%
Global 3 Class | American Electric Power | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 218,250
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 222,010
Percent of Partners' Capital (Net Asset Value)       1.17%
Global 3 Class | American Honda Finance | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 94,722   $ 229,737
Investments Owned, Rate of Return   1.50%   1.50%
Investments Owned, Fair Value   $ 95,298   $ 231,283
Percent of Partners' Capital (Net Asset Value)   1.77%   1.22%
Global 3 Class | AT&T, Inc. | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 211,358
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 210,876
Percent of Partners' Capital (Net Asset Value)       1.11%
Global 3 Class | GATX Corporation | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 218,824
Investments Owned, Rate of Return       1.80%
Investments Owned, Fair Value       $ 219,498
Percent of Partners' Capital (Net Asset Value)       1.16%
Global 3 Class | Wells Fargo & Company | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value   $ 94,722   $ 229,737
Investments Owned, Rate of Return   1.70%   1.70%
Investments Owned, Fair Value   $ 97,304   $ 245,105
Percent of Partners' Capital (Net Asset Value)   1.81%   1.29%
Global 3 Class | Others | Securities owned | Corporate Bonds        
Securities owned        
Investments Owned, Face Value       $ 152,200
Investments Owned, Rate of Return       1.50%
Investments Owned, Fair Value       $ 152,956
Percent of Partners' Capital (Net Asset Value)       0.80%
Global 3 Class | U.S. Mutual Fund | Securities owned | Grant Park Absolute Return Fund, Class I        
Securities owned        
Investments Owned, Shares   32,667    
Investments Owned, Cost   $ 368,465    
Investments Owned, Fair Value   $ 363,899    
Percent of Partners' Capital (Net Asset Value)   6.77%    
Global 3 Class | U.S. Exchange Traded Funds | Securities owned        
Securities owned        
Investments Owned, Shares   5,210    
Investments Owned, Cost   $ 152,928    
Investments Owned, Fair Value   $ 152,000    
Percent of Partners' Capital (Net Asset Value)   2.83%    
Global 3 Class | U.S. commercial paper | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Cost       $ 817,786
Investments Owned, Fair Value       $ 820,645
Percent of Partners' Capital (Net Asset Value)       4.32%
Global 3 Class | Coca-Cola Corp | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 459,472
Investments Owned, Rate of Return       0.80%
Investments Owned, Fair Value       $ 458,857
Percent of Partners' Capital (Net Asset Value)       2.42%
Global 3 Class | Others | Securities owned | Commercial paper        
Securities owned        
Investments Owned, Face Value       $ 361,834
Investments Owned, Rate of Return Range Minimum       0.90%
Investments Owned, Rate of Return Range Maximum       1.40%
Investments Owned, Fair Value       $ 361,788
Percent of Partners' Capital (Net Asset Value)       1.90%
[1] No individual position constituted greater than 1 percent of partners' capital (net asset value).
[2] No individual position constituted greater than 1 percent of partners' capital (net asset value).