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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 |  |  |

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