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Accumulated Other Comprehensive Income Attributable to SMP (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance $ 630,082 $ 650,873
Ending balance 652,437 655,121
Unrealized loss on cash flow hedge, pretax 1,100 1,900
Unrealized loss on cash flow hedge, net of tax 800 1,400
Cash settlements payments, pretax 400 700
Cash settlement payments, net of tax 300 500
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (25,832) (5,974)
Other comprehensive income (loss) before reclassifications 9,339 (11)
Amounts reclassified from accumulated other comprehensive income 408 667
Net other comprehensive income (loss) 9,747 656
Tax amounts 2,430 (488)
Ending balance (13,655) (5,806)
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance (29,769) (8,897)
Other comprehensive income (loss) before reclassifications 10,881 (1,220)
Amounts reclassified from accumulated other comprehensive income 0 0
Net other comprehensive income (loss) 10,881 (1,220)
Tax amounts 2,134 0
Ending balance (16,754) (10,117)
Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 3,924 2,899
Other comprehensive income (loss) before reclassifications (1,542) 1,209
Amounts reclassified from accumulated other comprehensive income 412 671
Net other comprehensive income (loss) (1,130) 1,880
Tax amounts 294 (489)
Ending balance 3,088 4,290
Postretirement Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning balance 13 24
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (4) (4)
Net other comprehensive income (loss) (4) (4)
Tax amounts 2 1
Ending balance $ 11 $ 21