CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 31,057	$ 13,305	$ 50,266	$ 27,171
Other comprehensive income (loss), net of tax:
Currency translation	(8,741)	402	(7,161)	947
Defined benefit pension plans	856	1,144	1,729	2,295
Other postretirement benefit plans	(63)	(64)	(131)	(135)
Total other comprehensive income (loss), net	(7,948)	1,482	(5,563)	3,107
Comprehensive income	23,109	14,787	44,703	30,278
Comprehensive income attributable to noncontrolling interest	805	608	1,457	1,217
Comprehensive income attributable to NL stockholders	$ 22,304	$ 14,179	$ 43,246	$ 29,061