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Non-Marketable Investments - Additional Information (Detail) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Technology Related Private Equity Funds [Member]
Dec. 31, 2012
Technology Related Private Equity Funds [Member]
Jun. 30, 2013
Non-marketable Investments [Member]
Jun. 30, 2012
Non-marketable Investments [Member]
Jun. 30, 2013
Non-marketable Investments [Member]
Jun. 30, 2012
Non-marketable Investments [Member]
Jun. 30, 2013
Maximum [Member]
Participant
Jun. 30, 2013
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]                    
Carrying value of the Company's non-marketable investments     $ 6,600,000 $ 6,900,000            
Ownership interest of company                   5.00%
Gain (losses) from non-marketable investments         (100,000) 100,000 (100,000) 100,000    
Book value of investment 1,000,000 1,200,000                
Bonus paid under cash bonus plan $ 0                  
Cash bonus plan expiration date Jun. 30, 2015                  
Participant in the cash bonus plan                 10