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Commitments and Contingencies - Lead Pigment Litigation and Environmental Matters and Litigation - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 24, 2019
USD ($)
defendant
installment
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
installment
Dec. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
case
site
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Commitments And Contingent Liabilities [Line Items]                      
Litigation settlement               $ 11,800,000 $ 11,800,000    
Litigation settlement net present value               38,500,000 49,400,000    
Litigation settlement expense, net                   $ 19,300,000  
Current insurance recovery receivable               0 0    
Accrual for reasonably estimable environmental remediation and related matters             $ 99,700,000 97,600,000 98,600,000 99,700,000 $ 103,400,000
Other Environmental Cleanup Matters                      
Commitments And Contingent Liabilities [Line Items]                      
Accrual for reasonably estimable environmental remediation and related matters               5,000,000      
NL | Environmental Remediation Sites NL Named As PRP Or Defendant                      
Commitments And Contingent Liabilities [Line Items]                      
Accrual for reasonably estimable environmental remediation and related matters               $ 93,000,000      
Number of sites associated with remediation and related costs | site               32      
NL | Maximum | Environmental Remediation Sites NL Named As PRP Or Defendant                      
Commitments And Contingent Liabilities [Line Items]                      
Upper end range, estimate costs for remediation and related matters               $ 118,000,000      
Lead Pigment Litigation | NL                      
Commitments And Contingent Liabilities [Line Items]                      
Period by which loss contingency claims settled and dismissed               30 years      
Lead Pigment Litigation | NL | Minimum [Member]                      
Commitments And Contingent Liabilities [Line Items]                      
Number of cases settled and dismissed and found not liable | case               100      
California Lead Paint Litigation | NL                      
Commitments And Contingent Liabilities [Line Items]                      
Description of defendants               July 24, 2019, an order approving a global settlement agreement entered into among all of the plaintiffs and the three defendants remaining in the case (the Sherwin Williams Company, ConAgra Grocery Products and NL) was entered by the court and the case was dismissed with prejudice. The global settlement agreement provides that an aggregate $305 million will be paid collectively by the three co-defendants in full satisfaction of all claims resulting in a dismissal of the case with prejudice and the resolution of (i) all pending and future claims by the plaintiffs in the case, and (ii) all potential claims for contribution or indemnity between NL and its co-defendants in respect to the case.      
Number of Defendant | defendant 3                    
Settlement amount $ 305,000,000                    
Litigation settlement 101,700,000         $ 62,000,000          
Litigation settlement charge upon approval of settlement terms 25,000,000.0         45,000,000          
Remaining litigation settlement charge $ 76,700,000       $ 101,700,000 $ 20,000,000          
Number of annual installments | installment 6         5          
Remaining litigation settlement charge due in first installment $ 12,000,000.0                    
Remaining litigation settlement charge due in second installment 12,000,000                    
Remaining litigation settlement charge due in third installment 12,000,000                    
Remaining litigation settlement charge due in fourth installment 12,000,000                    
Remaining litigation settlement charge due in fifth installment 12,000,000                    
Remaining litigation settlement charge due in sixth installment $ 16,700,000                    
Litigation settlement, current       $ 300,000   $ 80,000,000          
Litigation settlement net present value         $ 96,300,000 $ 17,000,000          
Litigation settlement installments payment beginning term from approval           4 years          
Discounted rate for estimated present value of remaining litigation amount         1.90%            
Litigation settlement expense, net         $ 19,600,000         $ 19,300,000  
Litigation settlement, first annual installment payment   $ 12,000,000.0 $ 12,000,000.0                
Litigation settlement accrual payments       25,000,000.0              
Accretion expense             $ 600,000 $ 1,100,000 $ 1,300,000    
California Lead Paint Litigation | NL | Other Assets                      
Commitments And Contingent Liabilities [Line Items]                      
Escrow deposit       $ 9,000,000.0