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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 |  |  |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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