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Earnings Per Share - Schedule of Net Earnings Attributable to SMP and the Shares Used in Calculating Basic and Dilutive Net Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net earnings (loss) attributable to SMP      
Continuing operations $ 79,033 $ 53,628 $ 63,144
Discontinued operations (37,698) (26,128) (28,996)
Net earnings attributable to SMP [1] $ 41,335 $ 27,500 $ 34,148
Basic net earnings (loss) per common share attributable to SMP      
Continuing operations (in dollars per share) $ 3.59 $ 2.46 $ 2.91
Discontinued operations (in dollars per share) (1.71) (1.20) (1.34)
Diluted net earnings (loss) per common share attributable to SMP      
Continuing operations (in dollars per share) 3.52 2.41 2.85
Discontinued operations (in dollars per share) $ (1.68) $ (1.17) $ (1.31)
Weighted average number of common shares, basic (in shares) 21,986,301 21,801,141 21,716,177
Dilutive effect of restricted stock and performance-based stock (in shares) 497,290 435,919 445,164
Weighted average common shares outstanding - diluted (in shares) 22,483,591 22,237,060 22,161,341
[1] Throughout this Form 10-K, “SMP” refers to Standard Motor Products, Inc. and subsidiaries.