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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, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 650,873 $ 621,038
Balance at end of period 630,082 650,873
Unrealized gain (loss) 1,400 (1,200)
Unrealized gain (loss) on cash flow hedge, net of tax 1,000 (900)
Cash settlement receipts (payments), pretax 2,500 2,400
Cash settlement receipts (payments), net of tax 1,900 1,700
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (5,974) (12,470)
Other comprehensive income before reclassifications (20,492) 8,264
Amounts reclassified from accumulated other comprehensive income (2,542) (2,394)
Net other comprehensive income (loss) (23,034) 5,870
Tax amounts 3,176 626
Balance at end of period (25,832) (5,974)
Foreign Currency Translation    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (8,897) (16,330)
Other comprehensive income before reclassifications (23,385) 7,433
Amounts reclassified from accumulated other comprehensive income 0 0
Net other comprehensive income (loss) (23,385) 7,433
Tax amounts 2,513 0
Balance at end of period (29,769) (8,897)
Cash Flow Hedges    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 2,899 3,823
Other comprehensive income before reclassifications 2,893 831
Amounts reclassified from accumulated other comprehensive income (2,524) (2,372)
Net other comprehensive income (loss) 369 (1,541)
Tax amounts 656 617
Balance at end of period 3,924 2,899
Postretirement Benefit Plans    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period 24 37
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (18) (22)
Net other comprehensive income (loss) (18) (22)
Tax amounts 7 9
Balance at end of period $ 13 $ 24