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Accumulated Other Comprehensive Income, Changes in Accumulated Other Comprehensive Income by Component (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP	$ 610,020
Other comprehensive income before reclassifications	1,810
Amounts reclassified from accumulated other comprehensive income	(341)
Other comprehensive income, net	1,469
Balance attributable to SMP	621,644
Reclassification out of Accumulated Other Comprehensive Income [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Unrecognized loss relating to change in fair value of cash flow interest rate hedge	(1,900)
Unrecognized loss relating to change in fair value of cash flow interest rate hedge, net of tax	(1,400)
unrecognized loss, net of cash settlements	(500)
unrecognized loss, net of cash settlements, net of tax	(300)
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP	(12,470)
Balance attributable to SMP	(11,001)
Foreign Currency Translation [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP	(16,330)
Other comprehensive income before reclassifications	2,849
Amounts reclassified from accumulated other comprehensive income	0
Other comprehensive income, net	2,849
Balance attributable to SMP	(13,481)
Unrecognized Postretirement Benefit Costs (Credit) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP	37
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	(3)
Other comprehensive income, net	(3)
Balance attributable to SMP	34
Unrealized Derivative Gains (Losses) [Member]
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]
Balance attributable to SMP	3,823
Other comprehensive income before reclassifications	(1,039)	[1]
Amounts reclassified from accumulated other comprehensive income	(338)
Other comprehensive income, net	(1,377)
Balance attributable to SMP	$ 2,446
[1] Consists of the unrecognized loss relating to the change in fair value of the cash flow interest rate hedge of $1.9 million ($1.4 million, net of tax), net of cash settlements of  $0.5 million ($0.3 million, net of tax) in the three month ended March 31, 2023.

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