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Accumulated Other Comprehensive Income Attributable to SMP (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance $ 652,437 $ 630,082 $ 655,121 $ 650,873 $ 630,082 $ 650,873
Ending balance 703,459 652,437 654,322 655,121 703,459 654,322
Unrealized loss on cash flow hedge, pretax 2,000   100   3,100 2,000
Unrealized loss on cash flow hedge, net of tax 1,500   100   2,300 1,500
Cash settlements payments, pretax 500   700   900 1,300
Cash settlement payments, net of tax 400   500   700 1,000
Accumulated Other Comprehensive Income (Loss)            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (13,655) (25,832) (5,806) (5,974) (25,832) (5,974)
Other comprehensive income (loss) before reclassifications 24,962 9,339 (1,616) (11)    
Amounts reclassified from accumulated other comprehensive income 439 408 (2,014) 667    
Net other comprehensive income (loss) 25,401 9,747 (3,630) 656    
Tax amounts 5,079 2,430 (26) (488)    
Ending balance 16,825 (13,655) (9,462) (5,806) 16,825 (9,462)
Foreign Currency Translation            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance (16,754) (29,769) (10,117) (8,897) (29,769) (8,897)
Other comprehensive income (loss) before reclassifications 27,390 10,881 (3,733) (1,220)    
Amounts reclassified from accumulated other comprehensive income 0 0 0 0    
Net other comprehensive income (loss) 27,390 10,881 (3,733) (1,220)    
Tax amounts 4,562 2,134 0 0    
Ending balance 15,198 (16,754) (13,850) (10,117) 15,198 (13,850)
Cash Flow Hedges            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 3,088 3,924 4,290 2,899 3,924 2,899
Other comprehensive income (loss) before reclassifications (2,428) (1,542) 2,117 1,209    
Amounts reclassified from accumulated other comprehensive income 443 412 (2,010) 671    
Net other comprehensive income (loss) (1,985) (1,130) 107 1,880    
Tax amounts 516 294 (28) (489)    
Ending balance 1,619 3,088 4,369 4,290 1,619 4,369
Postretirement Benefit Plans            
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]            
Beginning balance 11 13 21 24 13 24
Other comprehensive income (loss) before reclassifications 0 0 0 0    
Amounts reclassified from accumulated other comprehensive income (4) (4) (4) (4)    
Net other comprehensive income (loss) (4) (4) (4) (4)    
Tax amounts 1 2 2 1    
Ending balance $ 8 $ 11 $ 19 $ 21 $ 8 $ 19