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Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2023
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP   $ 610,020
Other comprehensive income before reclassifications $ 3,509 5,319
Amounts reclassified from accumulated other comprehensive income (435) (776)
Other comprehensive income, net 3,074 4,543
Balance attributable to SMP 629,673 629,673
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 3,100 1,600
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax 2,300 1,200
Unrecognized gain, net of cash settlements 600 1,000
Unrecognized gain, net of cash settlements, net of tax 400 800
Accumulated Other Comprehensive Income (Loss) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP (11,001) (12,470)
Balance attributable to SMP (7,927) (7,927)
Foreign Currency Translation [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP (13,481) (16,330)
Other comprehensive income before reclassifications 1,247 4,096
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income, net 1,247 4,096
Balance attributable to SMP (12,234) (12,234)
Unrecognized Postretirement Benefit Costs (Credit) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP 34 37
Other comprehensive income before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (4) (7)
Other comprehensive income, net (4) (7)
Balance attributable to SMP 30 30
Unrealized Derivative Gains (Losses) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Balance attributable to SMP 2,446 3,823
Other comprehensive income before reclassifications [1] 2,262 1,223
Amounts reclassified from accumulated other comprehensive income (431) (769)
Other comprehensive income, net 1,831 454
Balance attributable to SMP $ 4,277 $ 4,277
[1]
Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $3.1 million ($2.3 million, net of tax) and $1.6 million ($1.2 million, net of tax) in the three months and six months ended June 30, 2023, respectively, net of cash settlements payments of $0.6 million ($0.4 million, net of tax) and $1 million ($0.8 million, net of tax) in the three months and six months ended June 30, 2023, respectively.