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Commitments and Contingencies (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Commitments and contingencies    
Structural or other improvement and repair costs incurred $ 95stan_StructuralOrOtherImprovementAndRepairCosts $ 101stan_StructuralOrOtherImprovementAndRepairCosts
Expected recovery through applicable indemnity of cost incurred expressed as percentage of total cost 80.00%stan_ExpectedRecoveryOfCostIncurredExpressedAsPercentageOfTotalCostThroughApplicableIndemnity  
Minimum    
Commitments and contingencies    
Estimated total structural and other improvement and repair costs related to lease contracts acquired in the Central Merger 7,000stan_EstimatedTotalStructuralAndOtherImprovementAndRepairCosts
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum    
Commitments and contingencies    
Estimated total structural and other improvement and repair costs related to lease contracts acquired in the Central Merger $ 22,000stan_EstimatedTotalStructuralAndOtherImprovementAndRepairCosts
/ us-gaap_RangeAxis
= us-gaap_MaximumMember