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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Line Items]                
Dividends received from Kronos Worldwide, Inc.           $ 25,356 $ 25,356 $ 23,948
Gross unrecognized tax benefits   $ 7,300       7,300 7,300 7,300
Uncertain tax position   4,053       1,717 4,053  
Unrecognized tax benefits, if recognize which would affect effective tax rate           7,300    
Currently payable (receivable)             200 (200)
Income tax expense (benefit)           2,515 (579) 15,361
Current payable to affiliate   801       725 801  
Valhi                
Income Tax Disclosure [Line Items]                
Current payable to affiliate           29    
Federal Income Tax Purposes                
Income Tax Disclosure [Line Items]                
Net operating loss carryforwards           $ 26,600    
Annual usage limitation           80.00%    
Net operating loss carryforwards expiration description           an indefinite carryforward period subject to an 80% annual usage limitation    
Kronos                
Income Tax Disclosure [Line Items]                
Dividends received from Kronos Worldwide, Inc.           $ 25,400 $ 25,400 $ 23,900
Kronos | CARES Act                
Income Tax Disclosure [Line Items]                
Cash tax benefit due to reversal of valuation allowance $ 500              
Percentage of adjusted taxable income           50.00% 30.00%  
Kronos | Germany                
Income Tax Disclosure [Line Items]                
Income tax benefit   3,000            
Current cash tax benefit   1,500            
Non-cash deferred income tax benefit   1,500            
Deferred income tax expense resulting from decrease in trade tax rate   $ 5,500            
Kronos | Deferred Tax Liability Non Current                
Income Tax Disclosure [Line Items]                
Uncertain tax position           $ 5,600    
Kronos | Corporate Tax Purposes | German                
Income Tax Disclosure [Line Items]                
Net operating loss carryforwards           531,000    
Kronos | Corporate Tax Purposes | Belgium                
Income Tax Disclosure [Line Items]                
Net operating loss carryforwards           $ 20,000    
Kronos European Subsidiaries | Transition Tax                
Income Tax Disclosure [Line Items]                
Currently payable (receivable)         $ 76,200      
Income tax expense (benefit)     $ 1,700          
Current income tax expense payment period         8 years      
Kronos European Subsidiaries | Valhi                
Income Tax Disclosure [Line Items]                
Income tax liability payable period           8 years    
Kronos European Subsidiaries | Valhi | Income Tax Payable                
Income Tax Disclosure [Line Items]                
Payable to affiliate           $ 56,600    
Noncurrent payable to affiliate           50,600    
Current payable to affiliate           $ 6,000    
Kronos German Subsidiary | Germany Revenue Agency | Germany- Canada APA | Earliest Tax Year                
Income Tax Disclosure [Line Items]                
Effective tax year       2005        
Kronos German Subsidiary | Germany Revenue Agency | Germany- Canada APA | Latest Tax Year                
Income Tax Disclosure [Line Items]                
Effective tax year       2017        
Kronos Canadian And German Subsidiaries | Germany- Canada APA                
Income Tax Disclosure [Line Items]                
Non-cash income tax benefit       $ 1,400