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Ownership Interests in and Advances to Partner Companies and Funds - Narrative (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2015
Apr. 30, 2015
Feb. 28, 2014
Jan. 31, 2014
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Investment [Line Items]                  
Cost method investments         $ 7,239   $ 7,239   $ 9,138
Proceeds from sale of business             11,379 $ 81,203  
Drive Factor [Member]                  
Investment [Line Items]                  
Amount held in escrow   $ 1,100              
Proceeds from sale of business   $ 9,100              
Gain on sale of business         6,100        
InfoBionic [Member]                  
Investment [Line Items]                  
Asset impairment charges         3,200        
Quantia [Member]                  
Investment [Line Items]                  
Asset impairment charges         2,900        
Quantia [Member] | Subsequent Event [Member]                  
Investment [Line Items]                  
Amount held in escrow $ 1,200                
Proceeds from sale of business 7,800                
Dabo [Member]                  
Investment [Line Items]                  
Asset impairment charges           $ 2,300      
Cost method investments         $ 0   0    
Crescendo Bioscience, Inc. [Member]                  
Investment [Line Items]                  
Realized gains on cost method investment               27,400  
Gain on Escrow Proceed Receipts             2,000    
Proceeds from sale of business     $ 38,400       $ 2,000    
Crescendo Bioscience, Inc. [Member] | Subsequent Event [Member]                  
Investment [Line Items]                  
Proceeds from sale of business 900                
Alverix, Inc. [Member]                  
Investment [Line Items]                  
Proceeds from sale of business       $ 15,700          
Gain on sale of business               $ 15,700  
Alverix [Member] | Subsequent Event [Member]                  
Investment [Line Items]                  
Proceeds from sale of business $ 1,700