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Stockholders Equity (Tables) | 6 Months Ended
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Jun. 30, 2021
Stockholders Equity Note [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Loss | Accumulated other comprehensive loss - Changes in accumulated other comprehensive loss attributable to NL stockholders, including amounts resulting from our investment in Kronos Worldwide (see Note 5), are presented in the table below.
| Three months ended |  |  | Six months ended |
| June 30, |  |  | June 30, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
| (In thousands) |
Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (182,961 | ) |  | $ | (169,030 | ) |  | $ | (172,843 | ) |  | $ | (169,575 | )
Other comprehensive income (loss) |  | 4,364 |  |  |  | 402 |  |  |  | (5,754 | ) |  |  | 947 |
Balance at end of period | $ | (178,597 | ) |  | $ | (168,628 | ) |  | $ | (178,597 | ) |  | $ | (168,628 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (77,214 | ) |  | $ | (79,553 | ) |  | $ | (78,257 | ) |  | $ | (80,704 | )
Other comprehensive income - amortization of net losses included in net periodic pension cost |  | 1,031 |  |  |  | 1,144 |  |  |  | 2,074 |  |  |  | 2,295 |
Balance at end of period | $ | (76,183 | ) |  | $ | (78,409 | ) |  | $ | (76,183 | ) |  | $ | (78,409 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (670 | ) |  | $ | (981 | ) |  | $ | (590 | ) |  | $ | (910 | )
Other comprehensive loss - amortization of net gains included in net periodic OPEB cost |  | (71 | ) |  |  | (64 | ) |  |  | (151 | ) |  |  | (135 | )
Balance at end of period | $ | (741 | ) |  | $ | (1,045 | ) |  | $ | (741 | ) |  | $ | (1,045 | )
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (260,845 | ) |  | $ | (249,564 | ) |  | $ | (251,690 | ) |  | $ | (251,189 | )
Other comprehensive income (loss) |  | 5,324 |  |  |  | 1,482 |  |  |  | (3,831 | ) |  |  | 3,107 |
Balance at end of period | $ | (255,521 | ) |  | $ | (248,082 | ) |  | $ | (255,521 | ) |  | $ | (248,082 | )

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