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Convertible Senior Notes (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2014
Jul. 31, 2013
Debt Instrument [Line Items]        
Convertible senior notes, principal amount $ 206,865 $ 215,000    
Convertible senior notes, debt issuance costs 3,858 5,834    
Convertible senior notes, net of debt issuance costs 203,007 209,166    
4.25% Convertible Senior Notes (due 2018)        
Debt Instrument [Line Items]        
Convertible senior notes, principal amount 93,865 100,000   $ 100,000
Convertible senior notes, debt issuance costs 1,098 2,181    
Convertible senior notes, net of debt issuance costs 92,767 97,819    
4.875% Convertible Senior Notes (due 2020)        
Debt Instrument [Line Items]        
Convertible senior notes, principal amount 113,000 115,000 $ 115,000  
Convertible senior notes, debt issuance costs 2,760 3,653    
Convertible senior notes, net of debt issuance costs $ 110,240 $ 111,347