Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Comprehensive Income
Net income	$ 10,541	$ 6,197	$ 12,335	$ 10,987
Effective portion of unrealized gain (loss) on cash flow hedge	14	(264)	(297)	(276)
Foreign currency translation	(124)	55	(295)	83
Comprehensive income	10,431	5,988	11,743	10,794
Less: Comprehensive income attributable to noncontrolling interest	784	890	1,236	1,377
Comprehensive income attributable to SP Plus Corporation	9,647	$ 5,098	10,507	$ 9,417
Accumulated Other Comprehensive Income
Balance at the beginning of the period			(205)
Change in other comprehensive income (loss)			(592)
Balance at the end of the period	(797)		(797)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income
Balance at the beginning of the period			(530)
Change in other comprehensive income (loss)			(295)
Balance at the end of the period	(825)		(825)
Effective Portion of Unrealized Gain (Loss) on Cash Flow Hedge
Accumulated Other Comprehensive Income
Balance at the beginning of the period			325
Change in other comprehensive income (loss)			(297)
Balance at the end of the period	$ 28		$ 28