Earnings Per Share - Schedule of Reconciliations of Earnings Available to Common Stockholders and Shares used in Calculating Basic and Dilutive Net Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Net earnings (loss) attributable to SMP
Continuing operations		$ 18,321	$ 13,705
Discontinued operations		(1,185)	(1,139)
Net earnings attributable to SMP per common share	[1]	$ 17,136	$ 12,566
Basic net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		$ 0.83	$ 0.63
Discontinued operations (in dollars per share)		(0.06)	(0.06)
Diluted net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		0.81	0.61
Discontinued operations (in dollars per share)		$ (0.06)	$ (0.05)
Weighted average common shares outstanding, basic (in shares)		22,167,006	21,886,810
Dilutive effect of restricted stock and performance-based stock (in shares)		552,726	433,058
Weighted average common shares outstanding, diluted (in shares)		22,719,732	22,319,868

[1] Throughout this Form 10-Q, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.