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Fair Value Option - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 14, 2019
Dec. 31, 2018
Sep. 30, 2018
Feb. 22, 2018
Fair Value Option Qualitative Disclosures Related To Election [Line Items]            
Percentage of conversion of convertible notes 5.75%          
Long term debt, fair value $ 26,307     $ 48,076    
Principal outstanding balance [1] $ 648,058     $ 675,229    
5.75% Senior Subordinated Notes Due August 2023            
Fair Value Option Qualitative Disclosures Related To Election [Line Items]            
Percentage of conversion of convertible notes 5.75% 5.75% 5.75%      
Convertible Notes            
Fair Value Option Qualitative Disclosures Related To Election [Line Items]            
Percentage of conversion of convertible notes         1.50%  
Convertible Notes | 5.75% Senior Subordinated Notes Due August 2023            
Fair Value Option Qualitative Disclosures Related To Election [Line Items]            
Percentage of conversion of convertible notes 5.75% 5.75%   5.75%   5.75%
Long term debt, fair value $ 26,300     $ 48,100    
Principal outstanding balance 105,700     $ 109,700    
Change in fair value of convertible notes $ 20,000 $ 24,300        
[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.