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Related Party Transactions - Additional Information (Detail) - SPS Commerce Foundation [Member] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Related Party Transaction [Line Items] |  |
Contributions to Foundation | $ 700,000 | $ 200,000
Legal obligations for future commitments to Foundation | 0 |
Directors of Foundation [Member] |  |
Related Party Transaction [Line Items] |  |
Officers' compensation from Foundation | $ 0 |

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