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Fair Value Measurements (Contingent Purchase Price Consideration, Measured at Estimated Fair Value on Recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets:      
Cash equivalents $ 47,240    
Marketable securities 0 2,678  
Liabilities:      
Warrants potentially settleable in cash 48,965 10,964  
Unobservable Inputs (Level 3) [Member]
      
Liabilities:      
Contingent purchase price consideration 6,821 7,142 6,351
Fair Value, Measurements, Recurring [Member]
      
Assets:      
Cash equivalents 42,349 32,431  
Marketable securities 0 2,678  
Total assets 42,349 35,109  
Liabilities:      
Warrants potentially settleable in cash 48,965 10,964  
Contingent purchase price consideration 6,821 7,142  
Total liabilities 55,786 18,106  
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets (Level 1) [Member]
      
Assets:      
Cash equivalents 42,349 32,431  
Marketable securities 0 2,678  
Total assets 42,349 35,109  
Liabilities:      
Warrants potentially settleable in cash 0 0  
Contingent purchase price consideration 0 0  
Total liabilities 0 0  
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
      
Assets:      
Cash equivalents 0 0  
Marketable securities 0 0  
Total assets 0 0  
Liabilities:      
Warrants potentially settleable in cash 48,965 10,964  
Contingent purchase price consideration 0 0  
Total liabilities 48,965 10,964  
Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3) [Member]
      
Assets:      
Cash equivalents 0 0  
Marketable securities 0 0  
Total assets 0 0  
Liabilities:      
Warrants potentially settleable in cash 0 0  
Contingent purchase price consideration 6,821 7,142  
Total liabilities $ 6,821 $ 7,142