Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 44,906	$ 21,180	$ 128,141	$ 83,264
Other comprehensive loss, net of tax:
Foreign currency translation adjustments (Note 6)	(32,361)	(13,868)	(58,075)	(18,073)
Pension and post-retirement plan actuarial gains, net of tax (Note 6)	2,299	3,701	6,893	11,070
Unrealized gains (losses) on available-for-sale securities (Note 6)	13	(11)	(5)	(15)
Reclassification from accumulated other comprehensive loss into net income	2,912	0	2,912	0
Total other comprehensive loss, net of tax	(27,137)	(10,178)	(48,275)	(7,018)
Comprehensive income	17,769	11,002	79,866	76,246
Less: Comprehensive income attributable to noncontrolling interests	0	0	0	(356)
Comprehensive income attributable to MSA Safety Incorporated	$ 17,769	$ 11,002	$ 79,866	$ 75,890