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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Balance at the beginning of the year | $ 242,374 |  |
Equity in earnings of Kronos Worldwide, Inc. | 34,323 | $ 19,437 | $ 26,470
Dividends received from Kronos | (25,356) | (25,356) | (25,356)
Equity in Kronos' other comprehensive income (loss): |  |  |
Balance at the end of the year | 264,803 | 242,374 |
Defined Benefit Pension Plans |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | 56 | 478 | 2,914
Kronos |  |  |
Balance at the beginning of the year | 242,400 | 248,400 | 255,500
Equity in earnings of Kronos Worldwide, Inc. | 34,300 | 19,400 | 26,500
Dividends received from Kronos | (25,400) | (25,400) | (25,400)
Equity in Kronos' other comprehensive income (loss): |  |  |
Currency translation | (2,100) | 4,100 | (500)
Other |  | (300) | (900)
Balance at the end of the year | 264,800 | 242,400 | 248,400
Kronos | Defined Benefit Pension Plans |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | $ 15,600 | (3,700) | (6,700)
Kronos | OPEB |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans |  | $ (100) | $ (100)

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