CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	$ 7,315	$ (5,939)
Other comprehensive income (loss), net of tax:
Currency translation	(4,966)	(1,666)
Defined benefit pension plans	379	393
Marketable debt securities	14	(48)
Other postretirement benefit plans	(47)	(60)
Total other comprehensive loss, net	(4,620)	(1,381)
Comprehensive income (loss)	2,695	(7,320)
Comprehensive income attributable to noncontrolling interest	475	773
Comprehensive income (loss) attributable to NL stockholders	$ 2,220	$ (8,093)