Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2020

Stockholders Equity Note [Abstract]

Schedule of Changes in 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
	March 31,
	2019			2020
	(In thousands)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(172,434	)	$	(172,843	)
Other comprehensive loss		(25	)		(10,118	)
Balance at end of period	$	(172,459	)	$	(182,961	)
Defined benefit pension plans:
Balance at beginning of period	$	(75,286	)	$	(78,257	)
Other comprehensive income - amortization of net losses included in net periodic pension cost		828			1,043
Balance at end of period	$	(74,458	)	$	(77,214	)
OPEB plans:
Balance at beginning of period	$	(550	)	$	(590	)
Other comprehensive loss - amortization of net gains included in net periodic OPEB cost		(70	)		(80	)
Balance at end of period	$	(620	)	$	(670	)
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(248,270	)	$	(251,690	)
Other comprehensive income (loss)		733			(9,155	)
Balance at end of period	$	(247,537	)	$	(260,845	)