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Gain on time charter agreement termination (Details) (USD $)
12 Months Ended 56 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 29, 2013
Jan. 04, 2012
Fair Value of Above/Below Market Acquired Time Charters [Line Items]            
Gain on time charter agreement termination $ 0us-gaap_GainLossOnContractTermination $ 0us-gaap_GainLossOnContractTermination $ 6,454,000us-gaap_GainLossOnContractTermination      
Star Sigma            
Fair Value of Above/Below Market Acquired Time Charters [Line Items]            
Gross daily charter rate         38,000sblk_GrossDailyCharterRate
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sblk_StarSigma2Member
 
Redelivery date       Dec. 31, 2011    
Metric tons of fuel oil           1,027sblk_FuelQuantity
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sblk_StarSigma2Member
Star Sigma - Amount received in cash            
Fair Value of Above/Below Market Acquired Time Charters [Line Items]            
Gain on time charter agreement termination           5,734,000us-gaap_GainLossOnContractTermination
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sblk_StarSigmaAmountReceivedInCashMember
Star Sigma - Amount received for fuels            
Fair Value of Above/Below Market Acquired Time Charters [Line Items]            
Gain on time charter agreement termination           $ 720,000us-gaap_GainLossOnContractTermination
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= sblk_StarSigmaAmountReceivedForFuelsMember