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Fair Value Measurements and Hedging - Additional Information (Details)
€ in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Apr. 30, 2018
EUR (€)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading Symbol   SBLK        
Amount of cash held $ 204,921 $ 117,819 $ 204,921   $ 257,911  
Foreign exchange gain/ (loss)     (3,159)      
Fair value hedge gain/ (loss)   0 1,609   0  
Impairment loss   $ 3,411 17,784   $ 0  
Bunker swaps | ING Bank N.V.            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Metric Tons   84,000        
Percentage of estimated annual fuel consumption   10.00%        
Fixed bunker spread price   $ 266        
Derivative, Description of Hedged Item   In December 2019, the Company also entered into a bunker swap with ING Bank N.V. to hedge 84,000 metric tons or approximately 10% of its estimated annual fuel consumption by selling the 2020 Singapore spread between Very Low-Sulfur Fuel Oil (VLSFO) – High-Sulfur Fuel Oil (HSFO) at $266 per ton. The effective date of the swap is January 1, 2020 and the maturity date is December 31, 2020.        
Inception date   Jan. 01, 2020        
Maturity date   Dec. 31, 2020        
8.30% 2022 Notes            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading Symbol   SBLKZ        
Quoted Prices in Active Markets for Identical Assets (Level 1)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
2022 Notes fair value 49,800 $ 51,360 49,800      
Fair value hedging            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Amount of cash held | €           € 70,800
Fair value hedge gain/ (loss) $ 1,609          
Ineffective portion of fair value hedge     $ 39      
Payments for vessels upgrade | €       € 20,500    
Fair value hedging | Fixed orders            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Amount of cash held | €           € 20,500
Percentage of coverage through foreign currency hedging           100.00%
Fair value hedging | Optional orders            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Percentage of coverage through foreign currency hedging           50.00%