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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2023
Feb. 13, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Current Fiscal Year End Date --12-31    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 001-34702    
Entity Registrant Name SPS COMMERCE, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 41-2015127    
Entity Address, Address Line One 333 South Seventh Street    
Entity Address, Address Line Two Suite 1000    
Entity Address, City or Town Minneapolis    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55402    
City Area Code 612    
Local Phone Number 435-9400    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Trading Symbol SPSC    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Financial Statement Error Correction false    
Entity Public Float     $ 7.0
Entity Common Stock, Shares Outstanding   36,973,665  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Company’s definitive Proxy Statement for the Annual Meeting of Stockholders to be held on May 16, 2024 (the “2024 Proxy Statement”), which is expected to be filed within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K, are incorporated by reference in Part III of this Annual Report on Form 10-K. 		   
Entity Central Index Key 0001092699    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false