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Accumulated Other Comprehensive Income Attributable to SMP, Changes in Accumulated Other Comprehensive Income by Component (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
USD ($)
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]  
Balance at December 31, 2023 $ 635,064
Other comprehensive income (loss) before reclassifications 668
Amounts reclassified from accumulated other comprehensive income (500)
Other comprehensive income (loss), net 168
Balance at March 31, 2024 639,150
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 1,900
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax 1,400
Unrecognized gain, net of cash settlements 700
Unrecognized gain, net of cash settlements, net of tax 500
Accumulated Other Comprehensive Income (Loss) [Member]  
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]  
Balance at December 31, 2023 (5,974)
Balance at March 31, 2024 (5,806)
Foreign Currency Translation [Member]  
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]  
Balance at December 31, 2023 (8,897)
Other comprehensive income (loss) before reclassifications (1,220)
Amounts reclassified from accumulated other comprehensive income 0
Other comprehensive income (loss), net (1,220)
Balance at March 31, 2024 (10,117)
Unrealized Derivative Gains (Losses) [Member]  
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]  
Balance at December 31, 2023 2,899
Other comprehensive income (loss) before reclassifications 1,888 [1]
Amounts reclassified from accumulated other comprehensive income (497)
Other comprehensive income (loss), net 1,391
Balance at March 31, 2024 4,290
Unrecognized Postretirement Benefit Costs (Credit) [Member]  
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]  
Balance at December 31, 2023 24
Other comprehensive income (loss) before reclassifications 0
Amounts reclassified from accumulated other comprehensive income (3)
Other comprehensive income (loss), net (3)
Balance at March 31, 2024 $ 21
[1] Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $1.9 million ($1.4 million, net of tax), plus cash settlement receipts of $0.7 million ($0.5 million, net of tax) in the three months ended March 31, 2024.