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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2016
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract] |
Schedule of Changes in 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 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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