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Fair Value Measurements Narrative (Detail) (USD $)
12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Private equity funds [Member]
Dec. 31, 2012
Private equity funds [Member]
Dec. 31, 2013
Penn Mezzanine [Member]
Dec. 31, 2012
Penn Mezzanine [Member]
Dec. 31, 2013
Penn Mezzanine [Member]
Equity loss [Member]
Dec. 31, 2013
Level 3 [Member]
Private equity funds [Member]
Dec. 31, 2013
Level 3 [Member]
Penn Mezzanine [Member]
Dec. 31, 2013
PixelOptics, Inc. [Member]
Dec. 31, 2012
PixelOptics, Inc. [Member]
Feb. 28, 2013
Nupathe [Member]
Schedule of Available-for-sale Securities [Line Items]                        
Marketable securities, current $ 38,250,000 $ 110,957,000                    
Marketable securities, non current 6,088,000 29,059,000                    
Impairment charges     300,000 400,000 300,000 2,500,000 1,800,000     11,200,000 5,000,000  
Equity method investments 110,638,000 106,741,000 1,766,000 3,810,000           0    
Amount of gain associated with mark-to-market adjustments         1,100,000 200,000            
Shares converted                       2,500
Shares issued                       2,500,000
Fair market value of investment               $ 1,700,000 $ 1,300,000