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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Balance at the beginning of the period     $ 248,355  
Equity in earnings of Kronos Worldwide, Inc. $ 5,651 $ 8,944 13,858 $ 18,169
Dividends received from Kronos     (12,678) $ (12,678)
Equity in Kronos' other comprehensive income (loss):        
Balance at the end of the period 243,840   243,840  
Kronos        
Balance at the beginning of the period     248,400  
Equity in earnings of Kronos Worldwide, Inc.     13,900  
Dividends received from Kronos     (12,700)  
Equity in Kronos' other comprehensive income (loss):        
Currency translation     (7,300)  
Other     (300)  
Balance at the end of the period $ 243,800   243,800  
Kronos | Defined Benefit Pension Plans        
Equity in Kronos' other comprehensive income (loss):        
Defined benefit pension plans     $ 1,800