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Fair Value Measurement (Details 3) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Fair Value Measurement      
Long-term debt $ (267,171,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent   $ (253,400,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
Nonrecurring      
Fair Value Measurement      
Impairment charges 0us-gaap_AssetImpairmentCharges
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
0us-gaap_AssetImpairmentCharges
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
 
Carrying Amount      
Fair Value Measurement      
Cash and cash equivalents 18,794,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
  18,196,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Total Fair Value      
Fair Value Measurement      
Cash and cash equivalents 18,794,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
  18,196,000us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Senior Credit Facility, net of discount      
Fair Value Measurement      
Long-term debt (264,927,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  (251,010,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior Credit Facility, net of discount | Carrying Amount      
Fair Value Measurement      
Long-term debt (267,171,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  (253,400,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Senior Credit Facility, net of discount | Total Fair Value      
Fair Value Measurement      
Long-term debt (267,171,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
  (253,400,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
Other obligations      
Fair Value Measurement      
Long-term debt $ (2,244,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtObligationsMember
  $ (2,390,000)stan_LongTermDebtAndCapitalLeaseObligationsCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtObligationsMember