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Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP $ 601,580,000  
Other comprehensive income before reclassifications (4,312,000) $ (2,477,000)
Amounts reclassified from accumulated other comprehensive income 11,000 (16,000)
Other comprehensive income, net (4,301,000) (2,493,000)
Balance attributable to SMP 610,020,000 601,580,000
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Unrecognized gain relating to change in fair value of cash flow interest rate hedge 5,200,000  
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax 3,800,000  
Unrecognized gain, net of cash settlements payments 42,000  
Unrecognized gain, net of cash settlements payments, net of tax 31,000  
Accumulated Other Comprehensive Income (Loss) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP (8,169,000) (5,676,000)
Balance attributable to SMP (12,470,000) (8,169,000)
Foreign Currency Translation [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP (8,221,000) (5,744,000)
Other comprehensive income before reclassifications (8,109,000) (2,477,000)
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income, net (8,109,000) (2,477,000)
Balance attributable to SMP (16,330,000) (8,221,000)
Unrecognized Postretirement Benefit Costs (Credit) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP 52,000 68,000
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (15,000) (16,000)
Other comprehensive income, net (15,000) (16,000)
Balance attributable to SMP 37,000 52,000
Unrealized Derivative Gains (Losses) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP 0 0
Other comprehensive income before reclassifications 3,797,000 [1] 0
Amounts reclassified from accumulated other comprehensive income 26,000 0
Other comprehensive income, net 3,823,000 0
Balance attributable to SMP $ 3,823,000 $ 0
[1] Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $5.2 million ($3.8 million, net of tax), net of cash settlements payments of $42,000 ($31,000, net of tax) in the year ended December 31, 2022.