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Business Acquisitions - Business Purchase Price (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 18, 2018
Oct. 03, 2018
Dec. 31, 2018
Dec. 31, 2016
Business Acquisition [Line Items]        
SPS Commerce, Inc. common stock     $ 3,371 $ 2,922
E D I Admin [Member]        
Business Acquisition [Line Items]        
Cash   $ 7,461    
Fair value of earn-out liability   1,274    
Total purchase price   $ 8,735    
CovalentWorks [Member]        
Business Acquisition [Line Items]        
Cash $ 19,431      
SPS Commerce, Inc. common stock 3,371      
Total purchase price $ 22,802