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Accumulated Other Comprehensive Income Attributable to SMP (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning balance $ 703,459   $ 630,082 $ 654,322   $ 650,873 $ 630,082 $ 650,873
Ending balance 692,132 $ 703,459   653,444 $ 654,322   692,132 653,444
Unrealized loss on cash flow hedge, pretax       3,500     3,100 1,500
Unrealized loss on cash flow hedge, net of tax       2,600     2,300 1,100
Cash settlements payments, pretax 300     700     1,200 2,000
Cash settlement payments, net of tax 200     500     900 1,500
Accumulated Other Comprehensive Income (Loss)                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning balance 16,825 (13,655) (25,832) (9,462) (5,806) (5,974) (25,832) (5,974)
Other comprehensive income (loss) before reclassifications (2,602) 24,962 9,339 (334) (1,616) (11)    
Amounts reclassified from accumulated other comprehensive income (loss) 370 439 408 (675) (2,014) 667    
Net other comprehensive income (loss) (2,232) 25,401 9,747 (1,009) (3,630) 656    
Tax amounts (38) 5,079 2,430 897 (26) (488)    
Ending balance 14,555 16,825 (13,655) (9,574) (9,462) (5,806) 14,555 (9,574)
Foreign Currency Translation                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning balance 15,198 (16,754) (29,769) (13,850) (10,117) (8,897) (29,769) (8,897)
Other comprehensive income (loss) before reclassifications (2,265) 27,390 10,881 2,443 (3,733) (1,220)    
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0 0 0    
Net other comprehensive income (loss) (2,265) 27,390 10,881 2,443 (3,733) (1,220)    
Tax amounts (30) 4,562 2,134 0 0 0    
Ending balance 12,903 15,198 (16,754) (11,407) (13,850) (10,117) 12,903 (11,407)
Cash Flow Hedges                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning balance 1,619 3,088 3,924 4,369 4,290 2,899 3,924 2,899
Other comprehensive income (loss) before reclassifications (337) (2,428) (1,542) (2,777) 2,117 1,209    
Amounts reclassified from accumulated other comprehensive income (loss) 374 443 412 (672) (2,010) 671    
Net other comprehensive income (loss) 37 (1,985) (1,130) (3,449) 107 1,880    
Tax amounts (10) 516 294 897 (28) (489)    
Ending balance 1,646 1,619 3,088 1,817 4,369 4,290 1,646 1,817
Postretirement Benefit Plans                
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]                
Beginning balance 8 11 13 19 21 24 13 24
Other comprehensive income (loss) before reclassifications 0 0 0 0 0 0    
Amounts reclassified from accumulated other comprehensive income (loss) (4) (4) (4) (3) (4) (4)    
Net other comprehensive income (loss) (4) (4) (4) (3) (4) (4)    
Tax amounts 2 1 2 0 2 1    
Ending balance $ 6 $ 8 $ 11 $ 16 $ 19 $ 21 $ 6 $ 16