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Fair Value Measurement (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Level 3 | Contingent acquisition consideration    
Fair Value Inputs    
Weighted average discount rate (as a percent) 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByLiabilityClassAxis
= stan_ContingentConsiderationArrangementMember
 
Level 3 | Contingent acquisition consideration | Minimum    
Fair Value Inputs    
Probability of contingent consideration (as a percent) 25.00%stan_FairValueInputsProbabilityOfContingentConsiderationPayment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_RangeAxis
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Level 3 | Contingent acquisition consideration | Maximum    
Fair Value Inputs    
Probability of contingent consideration (as a percent) 32.00%stan_FairValueInputsProbabilityOfContingentConsiderationPayment
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByLiabilityClassAxis
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Recurring basis | Level 2    
Assets:    
Interest Rate Swaps   $ 824us-gaap_InterestRateDerivativeAssetsAtFairValue
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Recurring basis | Level 2 | Prepaid expenses and other    
Assets:    
Interest Rate Swaps 551us-gaap_InterestRateDerivativeAssetsAtFairValue
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Recurring basis | Level 3 | Contingent acquisition consideration | Accrued expenses    
Liabilities:    
Contingent acquisition consideration 64us-gaap_LiabilitiesFairValueDisclosure
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1,374us-gaap_LiabilitiesFairValueDisclosure
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Recurring basis | Level 3 | Contingent acquisition consideration | Other long term liabilities    
Liabilities:    
Contingent acquisition consideration 208us-gaap_LiabilitiesFairValueDisclosure
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$ 163us-gaap_LiabilitiesFairValueDisclosure
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