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Convertible Senior Notes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Convertible senior notes $ 215,000 $ 215,000
4.25% Convertible Senior Notes (due 2018)    
Debt Instrument [Line Items]    
Convertible senior notes 100,000 100,000
4.875% Convertible Senior Notes (due 2020)    
Debt Instrument [Line Items]    
Convertible senior notes $ 115,000 $ 115,000