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Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP $ 610,020  
Other comprehensive income before reclassifications 8,264 $ (4,312)
Amounts reclassified from accumulated other comprehensive income (1,768) 11
Other comprehensive income, net 6,496 (4,301)
Balance attributable to SMP 635,064 610,020
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 1,200 5,200
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax 900 3,800
Unrecognized gain, net of cash settlements 2,400 42
Unrecognized gain, net of cash settlements, net of tax 1,700 31
Accumulated Other Comprehensive Income (Loss) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP (12,470) (8,169)
Balance attributable to SMP (5,974) (12,470)
Foreign Currency Translation [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP (16,330) (8,221)
Other comprehensive income before reclassifications 7,433 (8,109)
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income, net 7,433 (8,109)
Balance attributable to SMP (8,897) (16,330)
Unrecognized Postretirement Benefit Costs (Credit) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP 37 52
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (13) (15)
Other comprehensive income, net (13) (15)
Balance attributable to SMP 24 37
Unrealized Derivative Gains (Losses) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP 3,823 0
Other comprehensive income before reclassifications [1] 831 3,797
Amounts reclassified from accumulated other comprehensive income (1,755) 26
Other comprehensive income, net (924) 3,823
Balance attributable to SMP $ 2,899 $ 3,823
[1] Consists of the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $1.2 million ($0.9 million, net of tax) plus cash settlement receipts of $2.4 million ($1.7 million, net of tax) in the year ended December 31, 2023; and 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) minus cash settlement payments of $42,000 ($31,000, net of tax) in the year December 31, 2022.