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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Stockholders Equity Note [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) - Changes in accumulated other comprehensive income (loss) attributable to NL stockholders, including amounts resulting from our investment in Kronos Worldwide (see Note 6), are presented in the table below.
| Years ended December 31, |
| 2014 |  |  | 2015 |  |  | 2016 |
| (In thousands) |
Accumulated other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | 154,169 |  |  | $ | 47,112 |  |  | $ | 195 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) arising during the year |  | (107,057 | ) |  |  | (48,647 | ) |  |  | 20,278 |
Less reclassification adjustment for amounts included |  |  |  |  |  |  |  |  |  |  |
in realized loss |  | - |  |  |  | 1,730 |  |  |  | - |
Balance at end of year | $ | 47,112 |  |  | $ | 195 |  |  | $ | 20,473 |
Currency translation: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (133,816 | ) |  | $ | (154,173 | ) |  | $ | (172,384 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Arising during the year |  | (20,357 | ) |  |  | (18,211 | ) |  |  | (3,475 | )
Balance at end of year | $ | (154,173 | ) |  | $ | (172,384 | ) |  | $ | (175,859 | )
Interest rate swap: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | - |  |  | $ | - |  |  | $ | (445 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) arising during the year |  | - |  |  |  | (560 | ) |  |  | (393 | )
Reclassification adjustments for amounts included in equity in earnings of Kronos |  | - |  |  |  | 115 |  |  |  | 448 |
Balance at end of year | $ | - |  |  | $ | (445 | ) |  | $ | (390 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (56,644 | ) |  | $ | (75,260 | ) |  | $ | (72,712 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service cost and net losses |  |  |  |  |  |  |  |  |  |  |
included in net periodic pension cost |  | 2,107 |  |  |  | 2,884 |  |  |  | 2,655 |
Net actuarial gain (loss) arising during the year |  | (20,723 | ) |  |  | (336 | ) |  |  | (6,653 | )
Balance at end of year | $ | (75,260 | ) |  | $ | (72,712 | ) |  | $ | (76,710 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | 1,275 |  |  | $ | 282 |  |  | $ | (12 | )
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |
Amortization of prior service credit and net losses |  |  |  |  |  |  |  |  |  |  |
included in net periodic OPEB cost |  | (626 | ) |  |  | (547 | ) |  |  | (529 | )
Net actuarial gain (loss) arising during year |  | (367 | ) |  |  | 253 |  |  |  | 181 |
Balance at end of year | $ | 282 |  |  | $ | (12 | ) |  | $ | (360 | )
Total accumulated other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ | (35,016 | ) |  | $ | (182,039 | ) |  | $ | (245,358 | )
Other comprehensive income (loss) |  | (147,023 | ) |  |  | (63,319 | ) |  |  | 12,512 |
Balance at end of year | $ | (182,039 | ) |  | $ | (245,358 | ) |  | $ | (232,846 | )

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