XML 68 R53.htm IDEA: XBRL DOCUMENT v3.20.4
Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Balance at the beginning of the year $ 248,355    
Equity in earnings of Kronos Worldwide, Inc. 19,437 $ 26,470 $ 62,316
Dividends received from Kronos (25,356) (25,356) (23,948)
Equity in Kronos' other comprehensive income (loss):      
Balance at the end of the year 242,374 248,355  
Defined Benefit Pension Plans      
Equity in Kronos' other comprehensive income (loss):      
Defined benefit pension plans/ Other postretirement benefit plans 478 2,914 (772)
Kronos      
Balance at the beginning of the year 248,400 255,500 229,500
Equity in earnings of Kronos Worldwide, Inc. 19,400 26,500 62,300
Dividends received from Kronos (25,400) (25,400) (23,900)
Equity in Kronos' other comprehensive income (loss):      
Currency translation 4,100 (500) (10,100)
Other (300) (900)  
Balance at the end of the year 242,400 248,400 255,500
Kronos | Defined Benefit Pension Plans      
Equity in Kronos' other comprehensive income (loss):      
Defined benefit pension plans/ Other postretirement benefit plans (3,700) (6,700) (2,200)
Kronos | OPEB      
Equity in Kronos' other comprehensive income (loss):      
Defined benefit pension plans/ Other postretirement benefit plans $ (100) $ (100) $ (100)