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Leasehold Improvements, Equipment, Land and Construction in Progress, net (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross $ 81,837stan_PropertyPlantAndEquipmentExcludingLandGross $ 89,094stan_PropertyPlantAndEquipmentExcludingLandGross $ 81,837stan_PropertyPlantAndEquipmentExcludingLandGross  
Less accumulated depreciation and amortization (38,202)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (47,560)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (38,202)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Leasehold improvements, equipment and construction in progress, net 43,635stan_PropertyPlantEquipmentExcludingLandNet 41,534stan_PropertyPlantEquipmentExcludingLandNet 43,635stan_PropertyPlantEquipmentExcludingLandNet  
Land 1,250us-gaap_Land 1,250us-gaap_Land 1,250us-gaap_Land  
Leasehold improvements, equipment, land and construction in progress, net 44,885us-gaap_PropertyPlantAndEquipmentNet 42,784us-gaap_PropertyPlantAndEquipmentNet 44,885us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense   12,020us-gaap_Depreciation 10,403us-gaap_Depreciation 6,672us-gaap_Depreciation
Proceeds from sale of equity interest in land 2,322us-gaap_ProceedsFromSaleOfLandHeldForUse   2,322us-gaap_ProceedsFromSaleOfLandHeldForUse  
Gain on sale of equity interest in land 1,191stan_GainLossOnSaleOfEquityInterestInLand   1,191stan_GainLossOnSaleOfEquityInterestInLand  
Equipment        
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross 30,563stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
33,576stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
30,563stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
 
Equipment | Minimum        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   2 years    
Equipment | Maximum        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   10 years    
Software        
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross 19,063stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
24,104stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
19,063stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
 
Software | Minimum        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   3 years    
Software | Maximum        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   10 years    
Vehicles        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   4 years    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross 8,075stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
8,585stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
8,075stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
 
Other.        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   10 years    
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross 282stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
311stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
282stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentOtherTypesMember
 
Leasehold improvements        
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross 18,642stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
20,420stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
18,642stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Leasehold improvements | Maximum        
Leasehold Improvements, Equipment, Land and Construction in Progress, net        
Ranges of Estimated useful life   10 years    
Construction in progress        
Leasehold Improvements, Equipment, Land and Construction in Progress, Net        
Leasehold improvements, equipment and construction in progress, gross $ 5,212stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 2,098stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 5,212stan_PropertyPlantAndEquipmentExcludingLandGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember