Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 02, 2016
Document and Entity Information
Entity Registrant Name	SP Plus Corp
Entity Central Index Key	0001059262
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		22,356,586
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3