Stockholders Equity (Tables)

9 Months Ended

Sep. 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						Nine months ended
	September 30,						September 30,
	2020			2021			2020			2021
	(In thousands)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(178,597	)	$	(168,628	)	$	(172,843	)	$	(169,575	)
Other comprehensive income (loss)		2,426			(1,859	)		(3,328	)		(912	)
Balance at end of period	$	(176,171	)	$	(170,487	)	$	(176,171	)	$	(170,487	)
Defined benefit pension plans:
Balance at beginning of period	$	(76,183	)	$	(78,409	)	$	(78,257	)	$	(80,704	)
Other comprehensive income - amortization of net   losses included in net periodic pension cost		1,075			1,133			3,149			3,428
Balance at end of period	$	(75,108	)	$	(77,276	)	$	(75,108	)	$	(77,276	)
OPEB plans:
Balance at beginning of period	$	(741	)	$	(1,045	)	$	(590	)	$	(910	)
Other comprehensive loss - amortization of net   gains included in net periodic OPEB cost		(70	)		(65	)		(221	)		(200	)
Balance at end of period	$	(811	)	$	(1,110	)	$	(811	)	$	(1,110	)
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(255,521	)	$	(248,082	)	$	(251,690	)	$	(251,189	)
Other comprehensive income (loss)		3,431			(791	)		(400	)		2,316
Balance at end of period	$	(252,090	)	$	(248,873	)	$	(252,090	)	$	(248,873	)