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Operating Segments - Active Partner Companies by Segment (Detail)
Dec. 31, 2016
Nov. 30, 2016
Oct. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Oct. 31, 2015
May 31, 2015
Dec. 31, 2014
May 31, 2014
Apr. 30, 2014
Advantedge Healthcare Solutions Inc [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 40.10%         40.10%     40.10%    
Aktana, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 31.20%       23.40%            
Apprenda [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 29.40%         29.50%     21.60%    
Beyond Com Inc [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 38.20%         38.20%     38.20%    
BrickWork [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 20.30%   20.30%                
Cask Data [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 31.30%         34.20% 34.20%        
CloudMine [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 30.10%         30.10%          
Clutch [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 42.80%         39.30%     29.60%    
Full Measure [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 35.20%         25.40%          
Good Start Genetics, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 29.60%         29.60%     29.90%    
Hoopla Software, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 25.50%         25.60%     25.60%    
InfoBionic [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 39.70%         38.50%     27.80%    
Lumesis, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 44.10%         44.70%     45.70%    
MediaMath, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 20.50%         20.60%     20.70% 20.60% 22.50%
meQuilibrium [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 31.50%         31.50%          
Moxe Health [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 32.40%     32.60%              
NovaSom, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 31.70%         31.70%     31.70%    
Pneuron [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 35.40%         35.40%     27.60%    
Medivo Inc [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 35.20%         34.50%     34.50%    
Propeller [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 24.00%         24.60%     24.60%    
QuanticMind, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 23.20%         23.60%          
Sonobi [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 21.60%         22.60%   22.60%      
Spongecell [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 23.00%         23.00%     23.00%    
Syapse, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 26.20%         24.40%     27.00%    
T-REX Group, Inc. [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 23.60% 23.60%                  
Transactis [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 24.20%         24.50%     24.80%    
Trice [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 27.60%         27.70%     31.90%    
WebLinc [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 38.00%         29.20%     29.20%    
Zipnosis [Member]                      
Schedule of Equity Method Investments [Line Items]                      
Ownership interest under equity method, percentage 25.40%         26.30%