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Accumulated Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2016
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Note 10 – 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 5), are presented in the table below.
| Three months ended |  |  | Nine months ended |
| September 30, |  |  | September 30, |
| 2015 |  |  | 2016 |  |  | 2015 |  |  | 2016 |
| (In thousands) |
Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 39,968 |  |  | $ | 2,394 |  |  | $ | 47,112 |  |  | $ | 195 |
Other comprehensive income - unrealized gains (losses) arising during the year |  | (34,513 | ) |  |  | 6,983 |  |  |  | (41,657 | ) |  |  | 9,182 |
Balance at end of period | $ | 5,455 |  |  | $ | 9,377 |  |  | $ | 5,455 |  |  | $ | 9,377 |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (165,944 | ) |  | $ | (170,533 | ) |  | $ | (154,173 | ) |  | $ | (172,384 | )
Other comprehensive income (loss) |  | (3,538 | ) |  |  | 1,777 |  |  |  | (15,309 | ) |  |  | 3,628 |
Balance at end of period | $ | (169,482 | ) |  | $ | (168,756 | ) |  | $ | (169,482 | ) |  | $ | (168,756 | )
Interest rate swap: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | — |  |  | $ | (1,173 | ) |  | $ | — |  |  | $ | (445 | )
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized gains (losses) arising during the year | $ | (733 | ) |  | $ | 32 |  |  | $ | (733 | ) |  | $ | (920 | )
Less reclassification adjustment for amounts included in interest expense |  | — |  |  |  | 113 |  |  |  | — |  |  |  | 337 |
Balance at end of period | $ | (733 | ) |  | $ | (1,028 | ) |  | $ | (733 | ) |  | $ | (1,028 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (73,439 | ) |  | $ | (71,082 | ) |  | $ | (75,260 | ) |  | $ | (72,712 | )
Other comprehensive income - amortization of net losses included in net periodic pension cost |  | 902 |  |  |  | 817 |  |  |  | 2,723 |  |  |  | 2,447 |
Balance at end of period | $ | (72,537 | ) |  | $ | (70,265 | ) |  | $ | (72,537 | ) |  | $ | (70,265 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 9 |  |  | $ | (276 | ) |  | $ | 282 |  |  | $ | (12 | )
Other comprehensive loss - amortization of prior service credit and net gains included in net periodic OPEB cost |  | (137 | ) |  |  | (132 | ) |  |  | (410 | ) |  |  | (396 | )
Balance at end of period | $ | (128 | ) |  | $ | (408 | ) |  | $ | (128 | ) |  | $ | (408 | )
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (199,406 | ) |  | $ | (240,670 | ) |  | $ | (182,039 | ) |  | $ | (245,358 | )
Other comprehensive income (loss) |  | (38,019 | ) |  |  | 9,590 |  |  |  | (55,386 | ) |  |  | 14,278 |
Balance at end of period | $ | (237,425 | ) |  | $ | (231,080 | ) |  | $ | (237,425 | ) |  | $ | (231,080 | )
See Note 12 for amounts related to our defined benefit pension plans and OPEB plans.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e689-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e716-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e709-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e681-108580 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Reclassification Adjustments -URI http://asc.fasb.org/extlink&oid=6522872 + Details
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