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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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