Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2017

Stockholders Equity Note [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						Six months ended
	June 30,						June 30,
	2016			2017			2016			2017
	(In thousands)
Accumulated other comprehensive loss, net of tax:
Marketable securities:
Balance at beginning of period	$	(1,336	)	$	18,751		$	195		$	20,473
Other comprehensive loss - unrealized    gains (losses) arising during the year		3,730			(2,869	)		2,199			(4,591	)
Balance at end of period	$	2,394		$	15,882		$	2,394		$	15,882
Currency translation:
Balance at beginning of period	$	(169,553	)	$	(174,088	)	$	(172,384	)	$	(175,859	)
Other comprehensive income (loss)		(980	)		2,925			1,851			4,696
Balance at end of period	$	(170,533	)	$	(171,163	)	$	(170,533	)	$	(171,163	)
Interest rate swap:
Balance at beginning of period	$	(1,016	)	$	(278	)	$	(445	)	$	(390	)
Other comprehensive income (loss):
Unrealized losses arising during the year		(269	)		(178	)		(952	)		(177	)
Less reclassification adjustment for    amounts included in interest expense		112			94			224			205
Balance at end of period	$	(1,173	)	$	(362	)	$	(1,173	)	$	(362	)
Defined benefit pension plans:
Balance at beginning of period	$	(71,905	)	$	(75,843	)	$	(72,712	)	$	(76,710	)
Other comprehensive income -    amortization of net losses included    in net periodic pension cost		823			393			1,630			1,260
Balance at end of period	$	(71,082	)	$	(75,450	)	$	(71,082	)	$	(75,450	)
OPEB plans:
Balance at beginning of period	$	(144	)	$	(408	)	$	(12	)	$	(360	)
Other comprehensive loss -    amortization of prior service credit and    net gains included in net periodic OPEB cost		(132	)		(48	)		(264	)		(96	)
Balance at end of period	$	(276	)	$	(456	)	$	(276	)	$	(456	)
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(243,954	)	$	(231,866	)	$	(245,358	)	$	(232,846	)
Other comprehensive income		3,284			317			4,688			1,297
Balance at end of period	$	(240,670	)	$	(231,549	)	$	(240,670	)	$	(231,549	)