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Document Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 28, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
Document Transition Report false    
Entity File Number 000-50796    
Entity Registrant Name SP PLUS CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 16-1171179    
Entity Address, Address Line One 200 E. Randolph Street, Suite 7700    
Entity Address, City or Town Chicago    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60601-7702    
City Area Code 312    
Local Phone Number 274-2000    
Title of 12(b) Security Common Stock, $0.001 par value per share    
Trading Symbol SP    
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    
Entity Shell Company false    
Entity Public Float     $ 730.2
Entity Common Stock, Shares Outstanding   22,997,061  
Documents Incorporated by Reference
Portions of the registrant's definitive proxy statement to be delivered to stockholders in connection with the Annual Meeting of Stockholders to be held on May 6, 2020 are incorporated by reference into Part III of this Form 10-K. The 2019 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
    
Entity Central Index Key 0001059262    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY