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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 24, 2019
USD ($)
Defendant
Installment
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Installment
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Cases
site
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Commitments and Contingent Liabilities [Line Items]                      
Recognized accretion expense               $ 1,321,000 $ 646,000    
Long-term litigation settlement             $ 60,081,000 49,403,000 60,081,000    
Litigation settlement expense                 19,266,000 $ 62,000,000  
Accrual for reasonably estimable environmental remediation and related matters             94,508,000 $ 93,416,000 $ 94,508,000 $ 98,211,000 $ 111,909,000
Customer Concentration Risk | Top Ten Customers | Sales Revenue                      
Commitments and Contingent Liabilities [Line Items]                      
Concentration risk percentage               48.00% 47.00% 44.00%  
Component Products | Customer Concentration Risk | Customer Two | Sales Revenue | CompX Security Products Business                      
Commitments and Contingent Liabilities [Line Items]                      
Concentration risk percentage               17.00% 14.00% 13.00%  
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      
Number of sites currently not able to reasonably estimate a range of costs | site               5      
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               $ 114,000,000      
Environmental Remediation Litigation                      
Commitments and Contingent Liabilities [Line Items]                      
Recoveries receivable             0 $ 0 $ 0    
Lead Pigment Litigation                      
Commitments and Contingent Liabilities [Line Items]                      
Number of cases settled and dismissed and found not liable | Cases               100      
Period by which loss contingency claims settled and dismissed               30 years      
Description of defendants               on 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 us) 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 us and our co-defendants in respect to the case      
Number of defendants | Defendant 3                    
Litigation settlement amount $ 305,000,000                    
NL's portion of global settlement amount, gross value 101,700,000         $ 62,000,000          
Litigation initial payment made 60 days after litigation settlement 25,000,000.0                    
Remaining litigation settlement charge $ 76,700,000         $ 20,000,000          
Number of annual installments | Installment 6         5          
Remaining litigation settlement payment due in first year $ 12,000,000.0                    
Remaining litigation settlement payment due in second year 12,000,000.0                    
Remaining litigation settlement payment due in third year 12,000,000.0                    
Remaining litigation settlement payment due in fourth year 12,000,000.0                    
Remaining litigation settlement payment due in fifth year 12,000,000.0                    
Remaining litigation settlement payment due in sixth year 16,700,000                    
Escrow deposit $ 9,000,000.0                    
Litigation initial payment   $ 12,000,000.0 $ 25,000,000.0                
Recognized accretion expense             $ 600,000 $ 1,300,000      
Litigation settlement, current           $ 80,000,000          
Litigation settlement charge upon approval of settlement terms           45,000,000          
Long-term litigation settlement           $ 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%   1.90%    
Litigation settlement expense         $ 19,600,000       $ 19,300,000    
Litigation settlement credit       $ 300,000              
Litigation settlement estimated net present value             $ 96,300,000   $ 96,300,000