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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.

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