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Fair Value Option - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Feb. 22, 2019
Feb. 22, 2018
Sep. 30, 2017
Fair Value Option Qualitative Disclosures Related To Election [Line Items]            
Long term debt, fair value $ 53,644   $ 50,868      
Principal outstanding balance [1],[2] $ 549,728   $ 564,401      
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%        
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% 5.75%  
Long term debt, fair value $ 53,600   $ 50,900      
Principal outstanding balance 94,400   $ 94,400      
Changes in fair value of convertible notes $ 2,800 $ (800)        
[1] Carrying amounts include aggregate unamortized debt discount and debt issuance costs.
[2] Includes the 5.75% Convertible Notes accounted for under the fair value option. Refer to Note 7.