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Fair Value Option - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Feb. 22, 2018
Dec. 31, 2017
Fair Value Option Qualitative Disclosures Related To Election [Line Items]        
Debt instrument, interest rate, stated percentage 5.75% 5.75%    
Long term debt, fair value $ 73,128 $ 73,128   $ 0
Principal outstanding balance [1] $ 717,586 $ 717,586   $ 800,842
5.75% Senior Subordinated Notes Due August 2023        
Fair Value Option Qualitative Disclosures Related To Election [Line Items]        
Debt instrument, interest rate, stated percentage 5.75% 5.75%    
Convertible Notes        
Fair Value Option Qualitative Disclosures Related To Election [Line Items]        
Debt instrument, interest rate, stated percentage 1.50% 1.50%    
Convertible Notes | 5.75% Senior Subordinated Notes Due August 2023        
Fair Value Option Qualitative Disclosures Related To Election [Line Items]        
Debt instrument, interest rate, stated percentage 5.75% 5.75% 5.75%  
Long term debt, fair value $ 73,100 $ 73,100    
Principal outstanding balance 111,000 111,000    
Change in fair value of convertible notes $ 32,100 $ 56,500    
[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.