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Investments - Additional Information (Detail) - Vehicle
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | Cambridge [Member]    
Schedule of Investments [Line Items]    
Leverage applied to assets 200.00%  
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | Cambridge Master Fund [Member]    
Schedule of Investments [Line Items]    
Number of trading vehicle 1  
Percentage of fund owned 22.67% 31.51%
Percentage of Partnership Net Assets 102.00% 89.30%
Morgan Stanley Smith Barney Spectrum Currency and Commodity L.P. [Member] | KR Master Fund [Member]    
Schedule of Investments [Line Items]    
Number of trading vehicle 1  
Commodity Program leverage permitted 150.00%  
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member]    
Schedule of Investments [Line Items]    
Percentage of Partnership Net Assets 102.85% 103.71%
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | MB Master Fund [Member]    
Schedule of Investments [Line Items]    
Percentage of Partnership Net Assets 36.33% 9.81%
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | PGR Master Fund [Member]    
Schedule of Investments [Line Items]    
Percentage of Partnership Net Assets 50.66% 14.82%
Morgan Stanley Smith Barney Spectrum Strategic L.P. [Member] | BHM I, LLC [Member]    
Schedule of Investments [Line Items]    
Percentage of Partnership Net Assets 15.86% 79.08%
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | SECOR Master Fund LP [Member]    
Schedule of Investments [Line Items]    
Number of trading vehicle 1  
Percentage of fund owned 54.40%  
Percentage of Partnership Net Assets 30.45%  
Morgan Stanley Smith Barney Spectrum Technical L.P. [Member] | Blackwater Master Fund [Member]    
Schedule of Investments [Line Items]    
Number of trading vehicle 1  
Percentage of fund owned   67.80%
Percentage of Partnership Net Assets   15.50%