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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
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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.

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