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Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Royalty rights $ 339,338 [1] $ 399,204 [2]
Financial assets:    
Assets, Fair Value 475,002 499,260
Foreign Currency Contract, Asset, Fair Value Disclosure 0 2,802
Warrants and Rights Outstanding 1,034 984
Money Market Funds [Member]    
Financial assets:    
Cash and Cash Equivalents, Fair Value 59,630 94,801
Certificates of Deposit [Member]    
Financial assets:    
Available for Sale Securities, Fair Value 75,000 0
Equity Securities [Member]    
Financial assets:    
Available for Sale Securities, Fair Value 0 1,469
Fair Value Level 1 [Member]    
Financial assets:    
Assets, Fair Value 59,630 94,801
Foreign Currency Contract, Asset, Fair Value Disclosure 0 0
Fair Value Level 1 [Member] | Money Market Funds [Member]    
Financial assets:    
Cash and Cash Equivalents, Fair Value 59,630 94,801
Fair Value Level 1 [Member] | Certificates of Deposit [Member]    
Financial assets:    
Available for Sale Securities, Fair Value 0 0
Fair Value Level 1 [Member] | Equity Securities [Member]    
Financial assets:    
Available for Sale Securities, Fair Value 0 0
Fair Value Level 2 [Member]    
Financial assets:    
Assets, Fair Value 75,339 5,255
Foreign Currency Contract, Asset, Fair Value Disclosure 0 2,802
Warrants and Rights Outstanding 339 984
Fair Value Level 2 [Member] | Money Market Funds [Member]    
Financial assets:    
Cash and Cash Equivalents, Fair Value 0 0
Fair Value Level 2 [Member] | Certificates of Deposit [Member]    
Financial assets:    
Available for Sale Securities, Fair Value 75,000 0
Fair Value Level 2 [Member] | Equity Securities [Member]    
Financial assets:    
Available for Sale Securities, Fair Value 0 1,469
Fair Value Level 3 [Member]    
Fair Value Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Royalty rights 339,338 399,204
Financial assets:    
Assets, Fair Value 340,033 $ 399,204
Warrants and Rights Outstanding $ 695  
[1] unaudited
[2] Note 1