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Long-Term Debt, Secured Credit Facilities - 6K (Details) $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 28, 2016 Installment | Dec. 07, 2015 USD ($) | Dec. 02, 2015 USD ($) Installment | Nov. 10, 2015 USD ($) | Nov. 04, 2015 USD ($) Installment | Nov. 03, 2015 USD ($) | Oct. 21, 2015 USD ($) | Oct. 13, 2015 USD ($) | Sep. 29, 2015 USD ($) | Sep. 11, 2015 USD ($) Vessel Installment Tranche | Sep. 01, 2015 USD ($) Vessel Installment Advance Tranche | Mar. 17, 2015 USD ($) | Mar. 06, 2015 USD ($) Installment | Sep. 30, 2016 USD ($) Installment Facility | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Installment Facility | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from draw down |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 47,813 | $ 179,047 | $ 0 | $ 0
Long-term portion |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170,625 |  | $ 176,787 | $ 0 |
Number of facilities guaranteed by Seanergy Maritime Holdings Corp. | Facility |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  | 5 |  |
Loan Agreement dated March 6, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,750 |  |  |  |  |
Proceeds from draw down |  |  |  |  |  |  |  |  |  |  |  | $ 8,750 |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  | Quarterly |  | Quarterly |  |
Balloon payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,950 |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 17, 2020 |  | Mar. 17, 2020 |  |
Term to meet consolidated installment and debt interest payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 months |  | 18 months |  |
Number of installments paid | Installment |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  | 3 |  |
Number of consecutive payment installments that can be partially deferred | Installment | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term portion |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 450 |  |  |  |
Loan Agreement dated March 6, 2015 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net income limit for declaring dividends |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Loan Agreement dated March 6, 2015 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  |  |  |  | 3.75% |  |  |  |  |
Loan Agreement dated March 6, 2015 [Member] | First Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Installment payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 200 |  |  |  |  |
Loan Agreement dated March 6, 2015 [Member] | After First Year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  |  |  |  |  |  |  |  |  |  |  | 16 |  |  |  |  |
Installment payment |  |  |  |  |  |  |  |  |  |  |  |  | $ 250 |  |  |  |  |
Loan Agreement dated September 1, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 44,430 |  |  |  |  |  |  |
Proceeds from draw down |  |  |  |  |  | $ 16,833 |  | $ 27,597 |  |  |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  | Quarterly |  | Quarterly |  |
Installment payment |  |  |  |  |  |  |  |  |  |  | $ 1,049 |  |  |  |  |  |  |
Balloon payment |  |  |  |  |  |  |  |  |  |  | $ 31,837 |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2020 |  | Jun. 30, 2020 |  |
Number of advances | Advance |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of tranches per advance | Tranche |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of vessels secured by first priority mortgage | Vessel |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Loan Agreement dated September 1, 2015 [Member] | LIBOR [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  |  | 3.25% |  |  |  |  |  |  |
Loan Agreement dated September 1, 2015 [Member] | LIBOR [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  |  | 3.60% |  |  |  |  |  |  |
Loan Agreement dated September 11, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  | $ 52,705 |  |  |  |  |  |  |  |
Proceeds from draw down |  |  |  |  |  |  | $ 13,642 |  | $ 13,643 | $ 25,420 |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  |  |  |  |  |  |  |  | 15 |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  | Quarterly |  | Quarterly |  |
Installment payment |  |  |  |  |  |  |  |  |  | $ 1,552 |  |  |  |  |  |  |  |
Balloon payment |  |  |  |  |  |  |  |  |  | $ 29,425 |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Dec. 28, 2020 |  | Dec. 28, 2020 |  |
Number of vessels secured by first priority mortgage | Vessel |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Number of tranches | Tranche |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Value to loan ratio, first threshold |  |  |  |  |  |  |  |  |  | 125.00% |  |  |  |  |  |  |  |
Value to loan ratio, second threshold |  |  |  |  |  |  |  |  |  | 166.67% |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
Commitment fee |  |  |  |  |  |  |  |  |  | $ 22 |  |  |  |  |  |  |  |
Loan Agreement dated September 11, 2015 [Member] | LIBOR [Member] | Loan to Value Ratio Less than 125% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  | 3.20% |  |  |  |  |  |  |  |
Loan Agreement dated September 11, 2015 [Member] | LIBOR [Member] | Loan to Value Ratio Between 125% and 166.67% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |  |
Loan Agreement dated September 11, 2015 [Member] | LIBOR [Member] | Loan to Value Ratio Greater than 166.67% [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  |  |  |  |  |  | 2.75% |  |  |  |  |  |  |  |
Loan Agreement dated November 4, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 33,750 |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from draw down |  |  |  | $ 33,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  |  |  | 16 |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  | Quarterly |  | Quarterly |  |
Installment payment |  |  |  |  | $ 844 |  |  |  |  |  |  |  |  |  |  |  |  |
Balloon payment |  |  |  |  | $ 20,250 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Nov. 10, 2021 |  | Nov. 10, 2021 |  |
Term to meet consolidated installment and debt interest payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 months |  | 18 months |  |
Loan Agreement dated November 4, 2015 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of net income limit for declaring dividends |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Agreement dated November 4, 2015 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Agreement dated December 2, 2015 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 39,412 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from draw down |  | $ 39,412 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consecutive payment installments | Installment |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Frequency of periodic payment |  |  |  |  |  |  |  |  |  |  |  |  |  | Quarterly |  | Quarterly |  |
Installment payment |  |  | $ 985 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balloon payment |  |  | $ 24,637 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  | Feb. 26, 2021 |  | Feb. 26, 2021 |  |
Margin on variable rate |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Agreement dated December 2, 2015 [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Secured Credit Facilities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Margin on variable rate |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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