CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Parking services revenue:
Lease contracts	$ 135,815us-gaap_ParkingRevenue	$ 116,635us-gaap_ParkingRevenue
Management contracts	94,058us-gaap_ManagementFeesRevenue	89,955us-gaap_ManagementFeesRevenue
Reimbursed management contract revenue	174,281us-gaap_ReimbursementRevenue	169,178us-gaap_ReimbursementRevenue
Total revenue	404,154us-gaap_SalesRevenueNet	375,768us-gaap_SalesRevenueNet
Cost of parking services:
Lease contracts	128,693	112,084
Management contracts	59,990us-gaap_ServiceManagementCosts	59,214us-gaap_ServiceManagementCosts
Reimbursed management contract expense	174,281us-gaap_CostOfReimbursableExpense	169,178us-gaap_CostOfReimbursableExpense
Total cost of parking services	362,964us-gaap_CostOfRevenue	340,476us-gaap_CostOfRevenue
Gross profit:
Lease contracts	7,122stan_LeaseContractsGrossProfit	4,551stan_LeaseContractsGrossProfit
Management contracts	34,068stan_ManagementContractsGrossProfit	30,741stan_ManagementContractsGrossProfit
Total gross profit	41,190us-gaap_GrossProfit	35,292us-gaap_GrossProfit
General and administrative expenses	25,673us-gaap_GeneralAndAdministrativeExpense	26,066us-gaap_GeneralAndAdministrativeExpense
Depreciation and amortization	7,934us-gaap_DepreciationAndAmortization	7,163us-gaap_DepreciationAndAmortization
Operating income	7,583us-gaap_OperatingIncomeLoss	2,063us-gaap_OperatingIncomeLoss
Other expenses (income):
Interest expense	4,043us-gaap_InterestExpense	4,809us-gaap_InterestExpense
Interest income	(60)us-gaap_OtherNonoperatingIncome	(98)us-gaap_OtherNonoperatingIncome
Equity in losses from investment in unconsolidated entity	471
Total other expenses (income)	4,454us-gaap_NonoperatingIncomeExpense	4,711us-gaap_NonoperatingIncomeExpense
Income (loss) before income taxes	3,129	(2,648)
Income tax provision (benefit)	1,335us-gaap_IncomeTaxExpenseBenefit	(7,438)us-gaap_IncomeTaxExpenseBenefit
Net income	1,794us-gaap_ProfitLoss	4,790us-gaap_ProfitLoss
Less: Net income attributable to noncontrolling interest	452	487
Net income attributable to SP Plus Corporation	$ 1,342	$ 4,303
Net income per share:
Basic (in dollars per share)	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.20us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.19us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Weighted average common basic shares outstanding	22,127,725	21,977,836
Diluted (in shares)	22,528,609	22,351,845

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