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Benefit Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Benefit Plans      
Number of plans sponsored by the company 2stan_NumberOfPlans    
Expenses related to the savings and retirement plan $ 1,851us-gaap_DefinedContributionPlanCostRecognized $ 1,764us-gaap_DefinedContributionPlanCostRecognized $ 893us-gaap_DefinedContributionPlanCostRecognized
Savings and retirement plan      
Benefit Plans      
Employer match of first tier of employee contributions (as a percent) 50.00%stan_DefinedContributionPlanEmployerMatchLevelOne
/ stan_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis
= stan_SavingsAndRetirement401KPlanMember		    
First tier percentage of compensation eligible for match by employer 6.00%stan_DefinedContributionPlanEmployerMatchEmployeeContributionLevelOne
/ stan_DefinedContributionBenefitPlansDisclosureBenefitPlansAxis
= stan_SavingsAndRetirement401KPlanMember