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Key Component of Convertible Senior Notes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]      
Convertible senior notes, net $ 215,000 $ 215,000  
4.50% Convertible senior notes (due 2014)      
Debt Instrument [Line Items]      
Contractual interest expense on the coupon   1,463 $ 3,356
Amortization of debt discount and debt issuance costs recognized as interest expense   1,140 2,030
Amortization of Deferred Charges, Total   2,603 5,386
4.25% Convertible Senior Notes (due 2018)      
Debt Instrument [Line Items]      
Contractual interest expense 4,250 4,250 1,771
Amortization of debt discount and debt issuance costs recognized as interest expense 836 835 421
Amortization of Deferred Charges, Total 5,086 5,085 $ 2,192
Principal amount of notes 100,000 100,000  
Convertible senior notes, net 100,000 100,000  
4.875% Convertible Senior Notes (due 2020)      
Debt Instrument [Line Items]      
Contractual interest expense 5,606 3,135  
Amortization of debt discount and debt issuance costs recognized as interest expense 811 473  
Amortization of Deferred Charges, Total 6,417 3,608  
Principal amount of notes 115,000 115,000  
Convertible senior notes, net $ 115,000 $ 115,000