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Accumulated Other Comprehensive Income Attributable to SMP, Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Beginning balance   $ 635,064
Other comprehensive income (loss) before reclassifications $ (3,160) (2,492)
Amounts reclassified from accumulated other comprehensive income (496) (996)
Other comprehensive income (loss), net (3,656) (3,488)
Ending balance 640,018 640,018
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 100 2,000
Unrecognized gain relating to change in fair value of cash flow interest rate hedge, net of tax 100 1,500
Unrecognized gain, cash receipts 700 1,300
Unrecognized gain, cash receipts, net of tax 500 1,000
Accumulated Other Comprehensive Income (Loss) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Beginning balance (5,806) (5,974)
Ending balance (9,462) (9,462)
Foreign Currency Translation [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Beginning balance (10,117) (8,897)
Other comprehensive income (loss) before reclassifications (3,733) (4,953)
Amounts reclassified from accumulated other comprehensive income 0 0
Other comprehensive income (loss), net (3,733) (4,953)
Ending balance (13,850) (13,850)
Unrealized Derivative Gains (Losses) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Beginning balance 4,290 2,899
Other comprehensive income (loss) before reclassifications [1] 573 2,461
Amounts reclassified from accumulated other comprehensive income (494) (991)
Other comprehensive income (loss), net 79 1,470
Ending balance 4,369 4,369
Unrecognized Postretirement Benefit Costs (Credit) [Member]    
Changes in Accumulated Other Comprehensive Income by Component [Roll Forward]    
Beginning balance 21 24
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from accumulated other comprehensive income (2) (5)
Other comprehensive income (loss), net (2) (5)
Ending balance $ 19 $ 19
[1] Consists of the unrecognized gain relating to the change in fair value of the cash flow interest rate hedge of $0.1 million ($0.1 million, net of tax) and $2 million ($1.5 million, net of tax) in the three and six months ended June 30, 2024, respectively, and cash settlement receipts of $0.7 million ($0.5 million, net of tax) and $1.3 million ($1 million, net of tax) in the three and six months ended June 30, 2024, respectively.