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Fair Value Option - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Feb. 22, 2018
Sep. 30, 2017
Fair Value Option Qualitative Disclosures Related To Election [Line Items]        
Debt instrument, interest rate, stated percentage 5.75%      
Long term debt, fair value $ 47,277 $ 48,076    
Principal outstanding balance [1] $ 645,721 $ 675,229    
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 $ 47,300      
Principal outstanding balance 94,400      
Change in fair value of convertible notes $ 3,900 $ 81,000    
[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.