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Long-term Debt - Additional Information (Details)
$ in Thousands
3 Months Ended 4 Months Ended 5 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended
Mar. 31, 2019
USD ($)
Apr. 30, 2019
USD ($)
May 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Aug. 31, 2019
USD ($)
Oct. 07, 2019
USD ($)
Debt Instrument [Line Items]              
Repayments of debt       $ 366,116 $ 108,722    
ING $100,600 Facility              
Debt Instrument [Line Items]              
Initiation date       Mar. 28, 2019      
Line of Credit Facility, Increase       $ 52,800      
Number of loan tranches       4      
Vessels provided as collateral       The ING $100,600 Facility is also secured by a first priority mortgage on the vessels Star Magnanimus and Star Alessia.      
ING $100,600 Facility | Tranche A              
Debt Instrument [Line Items]              
Amount drawn down $ 32,100            
Number of installments       28      
Frequency of payments       quarterly      
Repayment installment       $ 535      
Balloon installment       $ 17,120      
Repayment period       7 years      
ING $100,600 Facility | Tranche B              
Debt Instrument [Line Items]              
Amount drawn down   $ 17,400          
Number of installments       28      
Frequency of payments       quarterly      
Repayment installment       $ 311      
Balloon installment       $ 8,700      
Repayment period       7 years      
ING $100,600 Facility | First Two Tranches              
Debt Instrument [Line Items]              
Line of credit facility, description       The first two tranches were used to refinance the outstanding amounts under the lease agreements of the Star Magnanimus and the Star Alessia.      
ING $100,600 Facility | Tranche C              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 1,400      
Amount drawn down     $ 1,400        
ING $100,600 Facility | Tranche D              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 1,400      
ING $100,600 Facility | Remaining Two Tranches              
Debt Instrument [Line Items]              
Line of credit facility, description       The remaining two tranches will be used to finance the acquisition and installation of scrubber equipment for the vessels Star Magnanimus and the Star Alessia.      
Number of installments       16      
Frequency of payments       quarterly      
Citibank $62,600 Facility              
Debt Instrument [Line Items]              
Initiation date       May 08, 2019      
Amount drawn down     $ 62,563        
Line of credit facility, description       The Citibank $62,600 Facility was used together with cash on hand to refinance the outstanding amounts under the lease agreements of the Star Virgo and the Star Marisa.      
Number of installments       20      
Frequency of payments       quarterly      
Repayment installment       $ 1,298      
Balloon installment       $ 36,611      
Expiration date       May 31, 2024      
Vessels provided as collateral       The Citibank $62,600 Facility is secured by a first priority mortgage on the vessels Star Virgo and Star Marisa.      
CTBC Facility              
Debt Instrument [Line Items]              
Initiation date       May 24, 2019      
Maximum borrowing capacity       $ 35,000      
Line of credit facility, description       The CTBC Facility was used to refinance the outstanding amount under the lease agreement of the ABOY Karlie.      
Number of installments       20      
Frequency of payments       quarterly      
Repayment installment       $ 730      
Balloon installment       $ 20,400      
Expiration date       May 31, 2024      
Vessels provided as collateral       The CTBC Facility is secured by a first priority mortgage on the vessel ABOY Karlie.      
NTT Facility              
Debt Instrument [Line Items]              
Initiation date       Jul. 31, 2019      
Maximum borrowing capacity       $ 17,500      
Line of credit facility, description       The NTT Facility was used to refinance the outstanding loan amount of $11,161 of the Star Aquarius under the "NIBC $32,000 Facility".      
Number of installments       27      
Frequency of payments       quarterly      
Repayment installment       $ 313      
Balloon installment       $ 9,063      
Expiration date       Aug. 31, 2026      
Vessels provided as collateral       The NTT Facility is secured by a first priority mortgage on the Star Aquarius.      
NTT Facility | Subsequent Event              
Debt Instrument [Line Items]              
Amount drawn down           $ 17,500  
NIBC $32,000 Facility | Subsequent Event              
Debt Instrument [Line Items]              
Repayments of debt           $ 11,161  
CEXIM $106,470 Facility              
Debt Instrument [Line Items]              
Initiation date       Sep. 23, 2019      
Maximum borrowing capacity       $ 106,470      
Number of loan tranches       3      
Line of credit facility, description       The CEXIM $106,470 Facility will be used to finance the outstanding amounts under the lease agreements of the Katie K, the Debbie H and the Star Ayesha.      
Vessels provided as collateral       The CEXIM $106,470 Facility will be secured by first priority mortgages on the vessels Katie K, Debbie H and Star Ayesha.      
CEXIM $106,470 Facility | Tranche A              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 35,490      
Maturity date       10 years after its drawndown date      
CEXIM $106,470 Facility | Tranche B              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 35,490      
Maturity date       10 years after its drawndown date      
CEXIM $106,470 Facility | Tranche C              
Debt Instrument [Line Items]              
Maximum borrowing capacity       $ 35,490      
Maturity date       10 years after its drawndown date      
DNB $310,000 Facility              
Debt Instrument [Line Items]              
Amount drawn down       $ 9,385      
DNB $310,000 Facility | Subsequent Event              
Debt Instrument [Line Items]              
Amount drawn down             $ 24,750
Scrubber equipment              
Debt Instrument [Line Items]              
Remaining borrowing capacity       $ 112,321