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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Balance at the beginning of the year | $ 255,565 |  |
Equity in earnings of Kronos Worldwide, Inc. | 26,470 | $ 62,316 | $ 107,785
Dividends received from Kronos | (25,356) | (23,948) | (21,132)
Equity in Kronos' other comprehensive income (loss): |  |  |
Balance at the end of the year | 248,355 | 255,565 |
Defined Benefit Pension Plans |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | 2,914 | (772) | 2,202
Kronos |  |  |
Balance at the beginning of the year | 255,500 | 229,500 | 120,300
Equity in earnings of Kronos Worldwide, Inc. | 26,500 | 62,300 | 107,800
Dividends received from Kronos | (25,400) | (23,900) | (21,100)
Equity in Kronos' other comprehensive income (loss): |  |  |
Currency translation | (500) | (10,100) | 17,500
Marketable securities |  |  | 900
Interest rate swap |  |  | 600
Other | (900) |  | 100
Balance at the end of the year | 248,400 | 255,500 | 229,500
Kronos | Defined Benefit Pension Plans |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | (6,700) | (2,200) | 3,600
Kronos | OPEB |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | $ (100) | $ (100) | $ (200)

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