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Investment in Kronos Worldwide, Inc. - Changes in Carrying Value of Investment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Balance at the beginning of the year | $ 140,695 |  |
Equity in earnings (losses) of Kronos | 13,171 | $ (52,770) | $ 30,161
Dividends received from Kronos | (21,132) | (21,132) | (21,132)
Equity in Kronos' other comprehensive income (loss): |  |  |
Balance at the end of the year | 120,346 | 140,695 |
Defined Benefit Pension Plans |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | 1,596 | (1,033) | (8,585)
OPEB |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | (430) | (386) | (1,205)
Kronos |  |  |
Balance at the beginning of the year | 140,700 | 237,700 | 284,500
Equity in earnings (losses) of Kronos | 13,200 | (52,800) | 30,200
Dividends received from Kronos | (21,100) | (21,100) | (21,100)
Equity in Kronos' other comprehensive income (loss): |  |  |
Marketable securities | 700 | 700 | (4,200)
Currency translation | (5,400) | (28,000) | (31,300)
Interest rate swap | 100 | (700) |
Balance at the end of the year | 120,300 | 140,700 | 237,700
Kronos | Defined Benefit Pension Plans |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | (7,800) | $ 4,900 | (20,100)
Kronos | OPEB |  |  |
Equity in Kronos' other comprehensive income (loss): |  |  |
Defined benefit pension plans/ Other postretirement benefit plans | $ (100) |  | $ (300)

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