CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 36,456	$ 53,360	$ 16,103
Other comprehensive income (loss), net of tax:
Currency translation	(6,956)	(1,660)	3,268
Defined benefit pension plans	24,611	12,236	(2,447)
Other postretirement benefit plans	110	(143)	(320)
Total other comprehensive income, net	17,765	10,433	501
Comprehensive income	54,221	63,793	16,604
Comprehensive income attributable to noncontrolling interest	2,612	2,172	1,423
Comprehensive income attributable to NL stockholders	$ 51,609	$ 61,621	$ 15,181