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Senior Debt - Additional Information (Detail)
€ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2024
EUR (€)
Sep. 30, 2023
USD ($)
Oct. 07, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Mar. 07, 2022
USD ($)
Line Of Credit Facility [Line Items]                  
Credit facility principal payments 2024 $ 2,600,000   $ 2,600,000            
Credit facility principal payments 2025 11,300,000   11,300,000            
Credit facility principal payments 2026 116,500,000   116,500,000            
Credit facility principal payments 2027 3,900,000   3,900,000            
Credit facility principal payments 2028 $ 0   $ 0            
Debt Instrument, Interest Rate, Effective Percentage 8.09%   8.09%       7.70%    
Weighted average interest rate on outstanding borrowings 7.33%   7.33%       8.29%    
Assets Current $ 276,266,000   $ 276,266,000       $ 281,437,000    
Liabilities 375,631,000   375,631,000       $ 362,800,000    
Revenues | €       € 750          
Net income (loss) $ 2,086,000 $ 3,330,000 $ 8,079,000   $ 9,032,000        
EFM JV [Member]                  
Line Of Credit Facility [Line Items]                  
Weighted average interest rate on outstanding borrowings 7.96%   7.96%       8.70%    
Assets Current $ 16,900,000   $ 16,900,000       $ 14,500,000    
Assets, Noncurrent 25,800,000   25,800,000       26,700,000    
Liabilities 31,300,000   31,300,000       12,500,000    
Revenues 10,700,000 9,000,000 34,600,000   28,300,000        
Net income (loss) 1,200,000 $ 1,000,000 3,900   $ 3,000        
Credit Agreement [Member]                  
Line Of Credit Facility [Line Items]                  
Unused credit availability under credit facility $ 82,700,000   $ 82,700,000       109,400,000    
Secured Debt           $ 400,000,000      
Credit Agreement [Member] | EFM JV [Member]                  
Line Of Credit Facility [Line Items]                  
Secured Debt                 $ 11,000,000
Subsidiary, Ownership Percentage, Parent                 63.00%
Federal Funds Rate [Member]                  
Line Of Credit Facility [Line Items]                  
Debt instrument, basis spread on variable rate     0.50% 0.50%          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                  
Line Of Credit Facility [Line Items]                  
Debt instrument, basis spread on variable rate     0.11% 0.11%          
Minimum [Member]                  
Line Of Credit Facility [Line Items]                  
Maximum consolidated leverage ratio 3.50%   3.50%            
Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                  
Line Of Credit Facility [Line Items]                  
Maximum consolidated leverage ratio 1.75%   1.75%            
Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Credit Agreement [Member]                  
Line Of Credit Facility [Line Items]                  
Debt instrument, basis spread on variable rate     0.11% 0.11%          
Minimum [Member] | Base Rate [Member]                  
Line Of Credit Facility [Line Items]                  
Debt instrument, basis spread on variable rate     1.75% 1.75%          
Maximum [Member]                  
Line Of Credit Facility [Line Items]                  
Maximum consolidated leverage ratio 4.00%   4.00%            
Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]                  
Line Of Credit Facility [Line Items]                  
Maximum consolidated leverage ratio 0.25%   0.25%            
Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | Credit Agreement [Member]                  
Line Of Credit Facility [Line Items]                  
Debt instrument, basis spread on variable rate     0.43% 0.43%          
Maximum [Member] | Base Rate [Member]                  
Line Of Credit Facility [Line Items]                  
Debt instrument, basis spread on variable rate     3.25% 3.25%          
Letters of Credit [Member]                  
Line Of Credit Facility [Line Items]                  
Aggregate principal amount outstanding under the credit facilities $ 13,800,000   $ 13,800,000       13,300,000    
Letters of Credit [Member] | EFM JV [Member]                  
Line Of Credit Facility [Line Items]                  
Aggregate principal amount outstanding under the credit facilities 7,700,000   7,700,000       8,900,000    
Bank Guarantees [Member]                  
Line Of Credit Facility [Line Items]                  
Bank guarantee issuance under bilateral lines and collateral               $ 80,000,000  
Bank guarantee agreement outstanding amount 46,300,000   46,300,000       45,800,000    
Bank Guarantees [Member] | Euro Denominated Bank Guarantee [Member]                  
Line Of Credit Facility [Line Items]                  
Bank guarantee agreement outstanding amount 1,700,000   1,700,000       1,300,000    
Netherlands Facility [Member] | Euro Denominated Bank Guarantee [Member]                  
Line Of Credit Facility [Line Items]                  
Bank guarantee agreement outstanding amount $ 2,400,000   $ 2,400,000       $ 2,300,000