XML 74 R63.htm IDEA: XBRL DOCUMENT v3.19.2
Fair Value Option - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 14, 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%   5.75%        
Long term debt, fair value $ 23,190   $ 23,190     $ 48,076    
Principal outstanding balance [1] $ 642,141   $ 642,141     $ 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% 5.75% 5.75% 5.75%      
Convertible Notes                
Fair Value Option Qualitative Disclosures Related To Election [Line Items]                
Debt instrument, interest rate, stated percentage               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% 5.75%   5.75% 5.75%  
Long term debt, fair value $ 23,200   $ 23,200     $ 48,100    
Principal outstanding balance 94,600   94,600     $ 109,700    
Change in fair value of convertible notes $ 300 $ 32,100 $ 20,300 $ 56,500        
[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.