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Acquisitions of Ownership Interests in Partner Companies and Funds - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 33 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 2 Months Ended 12 Months Ended 8 Months Ended 12 Months Ended 1 Months Ended 37 Months Ended 1 Months Ended 12 Months Ended 6 Months Ended 7 Months Ended 1 Months Ended 4 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Aug. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
ThingWorx, Inc.
Feb. 28, 2011
ThingWorx, Inc.
Apr. 30, 2011
PixelOptics, Inc.
Dec. 31, 2012
PixelOptics, Inc.
Aug. 31, 2012
MediaMath, Inc.
Dec. 31, 2012
MediaMath, Inc.
Feb. 29, 2012
Spongecell
Dec. 31, 2011
Hoopla Software, Inc.
Nov. 30, 2011
Medivo, Inc.
Sep. 30, 2011
Putney, Inc.
Aug. 31, 2011
Swap.com
Jun. 30, 2011
NovaSom, Inc.
Apr. 30, 2009
Portico
Dec. 31, 2010
Portico
Dec. 31, 2010
AdvantEdge Healthcare Solutions, Inc.
Dec. 31, 2009
AdvantEdge Healthcare Solutions, Inc.
Mar. 31, 2010
AdvantEdge Healthcare Solutions, Inc.
Sep. 30, 2010
Clarient
Nov. 30, 2012
DriveFactor Inc.
Dec. 31, 2011
DriveFactor Inc.
Oct. 31, 2012
Good Start Genetics, Inc.
Dec. 31, 2010
Good Start Genetics, Inc.
Oct. 31, 2012
NuPathe
Aug. 31, 2010
NuPathe
Apr. 30, 2010
NuPathe
Aug. 31, 2009
NuPathe
Aug. 31, 2012
Penn Mezzanine
Jan. 31, 2012
Penn Mezzanine
Aug. 31, 2011
Penn Mezzanine
Dec. 31, 2012
Penn Mezzanine
Dec. 31, 2011
Penn Mezzanine
Dec. 31, 2012
Penn Mezzanine
Maximum
Jul. 31, 2012
Alverix, Inc.
Oct. 31, 2011
Alverix, Inc.
Feb. 29, 2012
Lumesis
Oct. 31, 2009
Quinnova Pharmaceuticals
Sep. 30, 2010
Quinnova Pharmaceuticals
Apr. 30, 2010
Tengion
Dec. 31, 2008
Tengion
Dec. 31, 2012
Crescendo Bioscience, Inc.
Dec. 31, 2012
Appfirst
Schedule of Equity Method Investments [Line Items]                                                                                          
Ownership interest under the equity method, percentage                     23.10% 28.00% 30.00% 30.10%   31.70%                                 36.00%           31.60%         12.60% 35.00%
Acquisitions of ownership interests in companies and funds, net of cash acquired   $ 46,100,000 $ 85,329,000 $ 20,418,000 $ 5,000,000 $ 5,000,000 $ 25,000,000     $ 16,900,000 $ 10,000,000 $ 1,300,000 $ 6,300,000 $ 10,000,000 $ 8,100,000 $ 20,000,000 $ 9,300,000   $ 1,800,000 $ 13,500,000     $ 1,800,000 $ 1,700,000 $ 5,200,000 $ 6,800,000             $ 3,900,000 $ 13,900,000   $ 26,100,000   $ 7,600,000 $ 2,200,000 $ 5,000,000       $ 10,000,000 $ 6,500,000
Acquisitions of ownership interests in companies as available-for-sale securities                                                     5,000,000 3,500,000   12,000,000                       1,500,000 7,500,000    
Number of preferred stock units and warrants purchased                                                     2,500                                    
Convertible bridge loan               6,600,000             2,400,000                           2,700,000               1,200,000       700,000        
Shares of common stock to be purchased with preferred stock units and warrants                                                     2,500,000                                    
Company fund amount for convertible debt                 1,700,000                                                                        
Fund amount for participations in loan and equity interests                                                             1,700,000 2,500,000     9,700,000                    
Fund amount for participations in loan                                                             1,500,000 2,300,000     8,100,000                    
Fund amount for participations in equity interests                                                             100,000 200,000     1,300,000                    
Fund amount for participations in warrants                                                             100,000       300,000                    
Company funded for early and growth stage 400,000                                                                                        
Percentage of limited partnership interest 9.40%                                                                                        
Mezzanine debt financing                                   5,000,000                                                      
Company fund amount for short-term loan                                         1,300,000                                                
Warrants exercised, value                                           $ 600,000