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Ownership Interests in and Advances to Partner Companies and Funds - Narrative (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Investment [Line Items]            
Impairment     $ 0      
Unrealized gain (loss)         $ 4,500,000  
Cask Data            
Investment [Line Items]            
Proceeds from sale of equity method investments   $ 41,500,000        
Amount in holdbacks and escrows   $ 800,000        
Realized gain (loss) on disposal         34,900,000  
Transactis            
Investment [Line Items]            
Proceeds from sale of equity method investments $ 57,500,000          
Realized gain (loss) on disposal     $ 50,700,000      
Novasom, Inc.            
Investment [Line Items]            
Impairment         3,000,000 $ 3,000,000
Apprenda            
Investment [Line Items]            
Impairment           $ 11,300,000
Apprenda and CloudMine            
Investment [Line Items]            
Impairment         $ 11,300,000  
CloudMine            
Investment [Line Items]            
Impairment       $ 4,800,000