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Real Estate (Acquisitions) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Real Estate Properties [Line Items]    
Acquisitions of real estate assets $ 0us-gaap_PaymentsToAcquireRealEstate $ 2,412us-gaap_PaymentsToAcquireRealEstate
Condominium Units    
Real Estate Properties [Line Items]    
Acquisitions of real estate assets   $ 2,400us-gaap_PaymentsToAcquireRealEstate
/ us-gaap_RealEstatePropertiesAxis
= star_CondominiumUnitsMember
Number of properties acquired   1star_NumberofPropertiesAcquired
/ us-gaap_RealEstatePropertiesAxis
= star_CondominiumUnitsMember