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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Balance at the beginning of the period |  |  | $ 140,695 |
Equity in earnings of Kronos | $ 6,776 | $ (3,600) | 6,123 | $ (46,584)
Dividends received from Kronos |  |  | (15,849) | (15,849)
Equity in Kronos' other comprehensive income (loss): |  |  |  |
Balance at the end of the period | 138,550 |  | 138,550 |
Kronos |  |  |  |
Balance at the beginning of the period |  |  | 140,700 |
Equity in earnings of Kronos |  |  | 6,100 |
Dividends received from Kronos |  |  | (15,800) | $ (15,800)
Equity in Kronos' other comprehensive income (loss): |  |  |  |
Marketable securities |  |  | 300 |
Currency translation |  |  | 5,600 |
Interest rate swap |  |  | (900) |
Balance at the end of the period | $ 138,550 |  | 138,550 |
Kronos | Defined Benefit Pension Plans |  |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |  |
Defined benefit pension plans |  |  | $ 2,600 |

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