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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Summary Of Significant Accounting Policies [Line Items]          
Trade accounts receivable arising from contracts with customers   $ 522,300 $ 602,100    
Operating lease, right-of-use asset   136,292 133,864    
Operating lease, lease liability   139,062 137,823    
Foreign exchange transaction losses   $ (28,800) $ (27,400) $ (10,500)  
Maximum remaining expiration period for foreign currency forward contracts   1 year      
Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Payment terms   30 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      
Planned Major Maintenance Activities          
Summary Of Significant Accounting Policies [Line Items]          
Property, plant and equipment, useful life   12 months      
Accounting Standards Update 2016-02          
Summary Of Significant Accounting Policies [Line Items]          
Operating lease, right-of-use asset         $ 139,100
Operating lease, lease liability         $ 139,100
Mineral Resources Limited Wodgina Project          
Summary Of Significant Accounting Policies [Line Items]          
Interest percentage acquired 60.00%        
Ownership percentage 60.00% 60.00%