v3.25.4
Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Oct. 23, 2025
Oct. 18, 2023
Oct. 31, 2019
Summary Of Significant Accounting Policies [Line Items]              
Trade accounts receivable arising from contracts with customers   $ 538,500 $ 705,800        
Non-cash goodwill impairment charges $ 181,100 181,070 0 $ 0      
Foreign exchange transaction gains (losses)   $ (18,900) 67,500 39,900      
Maximum remaining expiration period for foreign currency forward contracts   1 year          
Restructuring charges and asset write-offs   $ 7,699 1,134,316 $ 9,491      
Other income, net              
Summary Of Significant Accounting Policies [Line Items]              
Restructuring charges and asset write-offs     $ 26,100        
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Eurecat S.A.              
Summary Of Significant Accounting Policies [Line Items]              
Ownership interest divested         50.00%    
Planned Major Maintenance Activities              
Summary Of Significant Accounting Policies [Line Items]              
Property, plant and equipment, useful life   12 months          
Minimum              
Summary Of Significant Accounting Policies [Line Items]              
Payment terms   15 days          
Timing between shipment and delivery   1 day          
Property, plant and equipment, useful life   2 years          
Finite-lived intangible assets, useful life   5 years          
Maximum              
Summary Of Significant Accounting Policies [Line Items]              
Payment terms   90 days          
Timing between shipment and delivery   45 days          
Property, plant and equipment, useful life   60 years          
Finite-lived intangible assets, useful life   25 years          
Mineral Resources Limited Wodgina Project | Mineral Resources Limited Wodgina Project              
Summary Of Significant Accounting Policies [Line Items]              
Interest percentage acquired           50.00% 60.00%