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Management Contracts and Related Arrangements with Affiliates (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 28, 2012
Oct. 02, 2012
Mar. 01, 2014
Management Contracts and Related Arrangements with Affiliates                            
Net management fees $ 85,519us-gaap_ManagementFeesRevenue $ 77,878us-gaap_ManagementFeesRevenue $ 84,931us-gaap_ManagementFeesRevenue $ 89,955us-gaap_ManagementFeesRevenue $ 90,911us-gaap_ManagementFeesRevenue $ 77,681us-gaap_ManagementFeesRevenue $ 88,659us-gaap_ManagementFeesRevenue $ 90,095us-gaap_ManagementFeesRevenue $ 338,283us-gaap_ManagementFeesRevenue $ 347,346us-gaap_ManagementFeesRevenue $ 230,501us-gaap_ManagementFeesRevenue      
Myron C. Warshauer | Employment agreement                            
Management Contracts and Related Arrangements with Affiliates                            
Post-employment benefit payments received by related party                 474stan_PaymentsForPostemploymentBenefitsDirectPayments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_MyronCWarshauerMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_EmploymentContractsMember		 506stan_PaymentsForPostemploymentBenefitsDirectPayments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_MyronCWarshauerMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_EmploymentContractsMember		 498stan_PaymentsForPostemploymentBenefitsDirectPayments
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_MyronCWarshauerMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_EmploymentContractsMember		      
Myron C. Warshauer | Consulting agreement                            
Management Contracts and Related Arrangements with Affiliates                            
Amount paid under arrangement                 178us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_MyronCWarshauerMember
/ us-gaap_TypeOfArrangementAxis
= stan_ConsultingAgreementMember		 178us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_MyronCWarshauerMember
/ us-gaap_TypeOfArrangementAxis
= stan_ConsultingAgreementMember		 183us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_MyronCWarshauerMember
/ us-gaap_TypeOfArrangementAxis
= stan_ConsultingAgreementMember		      
D&E Parking, Inc. | Property management services                            
Management Contracts and Related Arrangements with Affiliates                            
Number of facilities services are provided for                 12stan_NumberOfFacilitiesForWhichServicesProvided
/ us-gaap_ProductOrServiceAxis
= stan_PropertyManagementServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_DEParkingMember		 12stan_NumberOfFacilitiesForWhichServicesProvided
/ us-gaap_ProductOrServiceAxis
= stan_PropertyManagementServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_DEParkingMember		        
Net management fees                 $ 0us-gaap_ManagementFeesRevenue
/ us-gaap_ProductOrServiceAxis
= stan_PropertyManagementServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_DEParkingMember		 $ 285us-gaap_ManagementFeesRevenue
/ us-gaap_ProductOrServiceAxis
= stan_PropertyManagementServicesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_DEParkingMember		        
Central                            
Management Contracts and Related Arrangements with Affiliates                            
Standstill period for Central stockholders under the Initial Closing Agreements                       4 years    
Central | Kohlberg, Lubert-Adler and Versa                            
Management Contracts and Related Arrangements with Affiliates                            
Standstill period for related party under the Additional Closing Agreements                         4 years  
Central | Kohlberg, Lubert-Adler and Versa | Maximum                            
Management Contracts and Related Arrangements with Affiliates                            
Percentage of stock ownership for third party shares to be counted as present and vote as agreed at any meeting of stockholders                         10.00%stan_AdditionalClosingAgreementsPercentageOfStockOwnershipForThirdPartySharesToBeCountedAsPresentAtStockholderMeetingsAndVotePerAgreement
/ us-gaap_BusinessAcquisitionAxis
= stan_KCPCHoldingsIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_KohlbergLubertAdlerAndVersaMember		  
Central | Lubert-Adler Entities                            
Management Contracts and Related Arrangements with Affiliates                            
Common stock held (as a percent)                           6.10%stan_PercentageOfCommonStockHeldByRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= stan_KCPCHoldingsIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_LubertAdlerEntitiesMember
Central | Kohlberg Entities                            
Management Contracts and Related Arrangements with Affiliates                            
Common stock held (as a percent)                           16.40%stan_PercentageOfCommonStockHeldByRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= stan_KCPCHoldingsIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_KohlbergEntitiesMember
Central | Versa Entities                            
Management Contracts and Related Arrangements with Affiliates                            
Common stock held (as a percent)                           5.10%stan_PercentageOfCommonStockHeldByRelatedParty
/ us-gaap_BusinessAcquisitionAxis
= stan_KCPCHoldingsIncMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= stan_VersaEntitiesMember