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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (loss)	$ (1,998)	$ 21,247
Other comprehensive income (loss), net of tax:
Marketable securities	33,901	(25,875)
Currency translation	(5,390)	4,137
Total other comprehensive income (loss)	29,066	(21,311)
Comprehensive income (loss)	27,068	(64)
Comprehensive income attributable to noncontrolling interest	120	313
Comprehensive income (loss) attributable to NL stockholders	26,948	(377)
Defined Benefit Pension Plans [Member]
Other comprehensive income (loss), net of tax:
Defined benefit pension plans/ Other postretirement benefit plans	699	565
OPEB [Member]
Other comprehensive income (loss), net of tax:
Defined benefit pension plans/ Other postretirement benefit plans	$ (144)	$ (138)

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The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Net of tax amount of the appreciation (loss) in value of unsold available-for-sale securities attributable to the parent entity. Excludes amounts related to other than temporary impairment (OTTI) losses.

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