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Retirement Contributions - Schedule of Total Contribution to the Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Retirement Benefits [Abstract] |  |  |
Retirement contributions | $ 6,627 | $ 5,386 | $ 4,790

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- Definition Defined contribution plan employer not note discretionary contribution amount. + References No definition available. + Details
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Namespace Prefix: | spsc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration