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Debt - Additional information (Details)
€ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
payment
Dec. 01, 2020
USD ($)
Aug. 31, 2020
USD ($)
Feb. 28, 2021
USD ($)
Dec. 31, 2020
USD ($)
payment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
payment
Dec. 31, 2019
USD ($)
Dec. 31, 2020
EUR (€)
payment
Dec. 31, 2020
CAD ($)
payment
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
CAD ($)
Jun. 05, 2019
USD ($)
May 31, 2019
USD ($)
payment
Disclosure Of Borrowings [Line Items]                            
Repayment of borrowings             $ 132,714,000 $ 600,000,000            
Amortization of discount and transaction costs of senior secured notes due to early redemption             2,286,000 0            
Senior secured notes redemption premium             6,275,000 0            
Borrowings $ 501,132,000       $ 501,132,000   501,132,000 479,732,000            
Tüprag Metal Madencilik Sanayi ve Ticaret AS ("Tüprag")                            
Disclosure Of Borrowings [Line Items]                            
Payments of guarantee fees             1,344,000              
Senior Secured Notes due 2024                            
Disclosure Of Borrowings [Line Items]                            
Notional amount                         $ 300,000,000  
Borrowings, issuance percentage                         98.00%  
Debt fixed interest rate                         9.50%  
Repayment of borrowings   $ 8,183,000 $ 65,530,000       66,047,000              
Redemptions of borrowings   7,473,000 58,574,000                      
Repayments of redemption premium   $ 710,000 5,565,000                      
Repayments of interest     $ 1,391,000                      
Borrowings 226,647,000       226,647,000   226,647,000 287,568,000            
Senior Secured Credit Facility                            
Disclosure Of Borrowings [Line Items]                            
Notional amount                           $ 450,000,000
Term loan                            
Disclosure Of Borrowings [Line Items]                            
Notional amount $ 133,333,000       133,333,000 $ 200,000,000 133,333,000             $ 200,000,000
Repayment of borrowings         $ 33,333,000 $ 33,333,000 $ 66,667,000              
Number of payments on borrowings | payment 2       2   2   2 2       6
Borrowings $ 131,842,000       $ 131,842,000   $ 131,842,000 197,761,000            
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 2.25%       2.25%   2.25%   2.25% 2.25%        
Term loan | Repayment of Debt                            
Disclosure Of Borrowings [Line Items]                            
Repayment of borrowings       $ 11,100,000                    
Revolving credit facility                            
Disclosure Of Borrowings [Line Items]                            
Notional amount $ 150,000,000       $ 150,000,000   $ 150,000,000             $ 250,000,000
Borrowings $ 150,000,000       150,000,000   150,000,000 0            
Loan undrawn standby fee (as a percent) 0.5625%                          
Current prepaid expenses $ 2,191,000       2,191,000   2,191,000 2,865,000            
Non-Financial Letters of Credit                            
Disclosure Of Borrowings [Line Items]                            
Borrowings $ 70,800,000       $ 70,800,000   $ 70,800,000 64,500,000 € 57,600 $ 400 € 57,600 $ 400    
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 1.50%       1.50%   1.50%   1.50% 1.50%        
Borrowings, interest rate basis spread addition on LIBOR rate (as a percent) 0.37%       0.37%   0.37%   0.37% 0.37%        
Financial Letters of Credit                            
Disclosure Of Borrowings [Line Items]                            
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 2.25%       2.25%   2.25%   2.25% 2.25%        
Borrowings, interest rate basis spread addition on LIBOR rate (as a percent) 0.37%       0.37%   0.37%   0.37% 0.37%        
Bottom of range | Term loan                            
Disclosure Of Borrowings [Line Items]                            
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 2.25%       2.25%   2.25%   2.25% 2.25%        
Bottom of range | Revolving credit facility                            
Disclosure Of Borrowings [Line Items]                            
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 2.25%       2.25%   2.25%   2.25% 2.25%        
Top of range | Term loan                            
Disclosure Of Borrowings [Line Items]                            
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 3.25%       3.25%   3.25%   3.25% 3.25%        
Top of range | Revolving credit facility                            
Disclosure Of Borrowings [Line Items]                            
Borrowings, interest rate basis spread on LIBOR rate (as a percent) 3.25%       3.25%   3.25%   3.25% 3.25%        
Prior to December 1, 2021 | Senior Secured Notes due 2024                            
Disclosure Of Borrowings [Line Items]                            
Percentage of aggregate principal amount of borrowings (as a percent)                         100.00%  
Premium percentage of principal amount of borrowings (as a percent)                         1.00%  
Borrowings, additional basis points                         0.50%  
Percentage of original principal amount of borrowings (as a percent)                         35.00%  
Redemption percentage of aggregate principal amount of borrowings (as a percent)                         109.50%  
December 1, 2021 | Senior Secured Notes due 2024                            
Disclosure Of Borrowings [Line Items]                            
Redemption percentage of aggregate principal amount of borrowings (as a percent)                         107.125%  
After December 1, 2022 | Senior Secured Notes due 2024                            
Disclosure Of Borrowings [Line Items]                            
Redemption percentage of aggregate principal amount of borrowings (as a percent)                         100.00%  
Fair value | Senior Secured Notes due 2024                            
Disclosure Of Borrowings [Line Items]                            
Notional amount $ 260,500,000       $ 260,500,000   $ 260,500,000 324,000,000            
Gains on change in fair value of derivatives             1,760,000 $ 4,224,000            
Fair value | Term loan                            
Disclosure Of Borrowings [Line Items]                            
Borrowings $ 133,333,000       $ 133,333,000   $ 133,333,000