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		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Net Income (Loss) Attributable to Parent [Abstract]
Continuing operations		$ 26,581	$ 24,859	$ 54,424	$ 55,915
Discontinued operations		(22,771)	(18,200)	(24,727)	(28,201)
Net earnings attributable to SMP	[1]	$ 3,810	$ 6,659	$ 29,697	$ 27,714
Basic net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		$ 1.22	$ 1.14	$ 2.50	$ 2.58
Discontinued operations (in dollars per share)		(1.04)	(0.83)	(1.14)	(1.30)
Diluted net earnings (loss) per common share attributable to SMP
Continuing operations (in dollars per share)		1.20	1.12	2.45	2.52
Discontinued operations (in dollars per share)		$ (1.03)	$ (0.82)	$ (1.11)	$ (1.27)
Weighted average common shares outstanding, basic (in shares)		21,716,083	21,727,119	21,802,164	21,675,699
Dilutive effect of restricted stock and performance-based stock (in shares)		438,000	527,000	423,000	522,000
Weighted average common shares outstanding, diluted (in shares)		22,154,222	22,253,723	22,225,444	22,198,131

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