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Accumulated Other Comprehensive Income Attributable to SMP - Schedule of Accumulated Other Comprehensive by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 630,082 $ 650,873
Balance at end of period 698,262 630,082
Unrecognized losses, change in fair value of cash flow interest rate hedges 2,700 1,400
Cash settlement receipts, pretax 1,500 2,500
Cash settlement receipts, net of tax 1,100 1,900
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (25,832) (5,974)
Other comprehensive income before reclassifications 34,787 (20,492)
Amounts reclassified from accumulated other comprehensive income 1,490 (2,542)
Net other comprehensive income (loss) 36,277 (23,034)
Tax amounts 7,412 3,176
Balance at end of period 17,857 (25,832)
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (29,769) (8,897)
Other comprehensive income before reclassifications 38,997 (23,385)
Amounts reclassified from accumulated other comprehensive income 0 0
Net other comprehensive income (loss) 38,997 (23,385)
Tax amounts 6,703 2,513
Balance at end of period 15,931 (29,769)
Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 3,924 2,899
Other comprehensive income before reclassifications (4,210) 2,893
Amounts reclassified from accumulated other comprehensive income 1,506 (2,524)
Net other comprehensive income (loss) (2,704) 369
Tax amounts 703 656
Balance at end of period 1,923 3,924
Postretirement Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 13 24
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (16) (18)
Net other comprehensive income (loss) (16) (18)
Tax amounts 6 7
Balance at end of period $ 3 $ 13