Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Comprehensive Income
Net income	$ 5,087	$ 4,465	$ 16,074	$ 8,998
Effective portion of unrealized gain (loss) on cash flow hedge	293	(312)	17	849
Foreign currency translation	(130)	32	(47)	(240)
Comprehensive income	5,250	4,185	16,044	9,607
Less: comprehensive income attributable to noncontrolling interest	785	721	2,162	2,070
Comprehensive income attributable to SP Plus Corporation	4,465	3,464	13,882	7,537
Accumulated Other Comprehensive Income
Balance at the beginning of the period			118
Change in other comprehensive income (loss)			(30)
Balance at the end of the period	88		88
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income
Balance at the beginning of the period			(368)
Change in other comprehensive income (loss)			(47)
Balance at the end of the period	(415)		(415)
Effective Portion of Unrealized Gain (Loss) on Cash Flow Hedge
Accumulated Other Comprehensive Income
Balance at the beginning of the period			486
Change in other comprehensive income (loss)			17
Balance at the end of the period	$ 503		$ 503