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Property, Plant and Equipment - Additional Information (Detail)
£ in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Aug. 31, 2022
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2024
GBP (£)
Property Plant And Equipment [Line Items]                  
Finance lease assets gross value     $ 3,459   $ 3,459   $ 4,223    
Finance lease, lease related accumulated amortization     1,783   1,783   $ 1,959    
Depreciation expense     $ 4,613 $ 4,268 $ 9,195 $ 8,549      
Remaining lease term             20 years    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]     Long-Term Debt and Lease Obligation, Current   Long-Term Debt and Lease Obligation, Current   Long-Term Debt and Lease Obligation, Current   Long-Term Debt and Lease Obligation, Current
Estimated cost on upgrading existing equipment               $ 26,000  
Interest capitalized on strategic capital projects     $ 16 341 $ 251 602      
Depreciation on assets under finance leases     80 $ 67 162 $ 137      
Capital Expenditures [Member]                  
Property Plant And Equipment [Line Items]                  
Proceeds from disbursement agreement $ 2,500           $ 2,500    
Estimated cost on upgrading existing equipment   $ 2,500              
Union Electric Steel UK Limited [Member]                  
Property Plant And Equipment [Line Items]                  
Land and buildings held as collateral     $ 2,683   2,683       £ 2,122
UES Domestic [Member] | Construction-in-Process, Machinery and Equipment or Buildings [Member]                  
Property Plant And Equipment [Line Items]                  
Machinery and equipment purchased         $ 24,239