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Schedule I- Condensed Financial Information of Seanergy Maritime Holdings Corp. (Parent Company Only), Notes to Financial Statements - 20F (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 12, 2015 USD ($) Installment $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2016 USD ($) | Dec. 14, 2015 USD ($) | Dec. 01, 2015 USD ($) | Sep. 07, 2015 USD ($) $ / shares
Convertible Promissory Notes [Abstract] |  |  |  |  |  |  |  |
Secured loan facilities |  | $ 178,447 | $ 0 |  | $ 178,064 |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |
Basis of Presentation [Abstract] |  |  |  |  |  |  |  |
Cash dividends from subsidiaries |  | 0 | $ 0 | $ 0 |  |  |  |
Guarantee [Abstract] |  |  |  |  |  |  |  |
Maximum potential amount under guarantee |  | $ 178,447 |  |  |  |  |  |
Parent Company [Member] | Unsecured Convertible Promissory Note [Member] | Jelco [Member] |  |  |  |  |  |  |  |
Convertible Promissory Notes [Abstract] |  |  |  |  |  |  |  |
Convertible promissory notes | $ 4,000 |  |  |  |  |  |  |
Number of periodic payments | Installment | 10 |  |  |  |  |  |  |
Frequency of periodic payment |  | Semi-annual |  |  |  |  |  |
Semi-annual installment payment | $ 200 |  |  |  |  |  |  |
Balloon payment | $ 2,000 |  |  |  |  |  |  |
Maturity date |  | Mar. 19, 2020 |  |  |  |  |  |
Conversion price of convertible notes into common stock (in dollars per share) | $ / shares | $ 0.90 |  |  |  |  |  |  |
Parent Company [Member] | Unsecured Convertible Promissory Note [Member] | Jelco [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Convertible Promissory Notes [Abstract] |  |  |  |  |  |  |  |
Number of consecutive payment installments that can be deferred | Installment | 3 |  |  |  |  |  |  |
Parent Company [Member] | Unsecured Revolving Convertible Note [Member] | Jelco [Member] |  |  |  |  |  |  |  |
Convertible Promissory Notes [Abstract] |  |  |  |  |  |  |  |
Convertible promissory notes |  |  |  |  |  |  |  | $ 6,765
Decrease in Applicable Limit |  |  |  |  |  | $ (2,000) |  | $ (1,000)
Conversion price of convertible notes into common stock (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0.90
Maximum principal amount available to be drawn |  |  |  |  |  | $ 11,765 | $ 9,765 |
Secured loan facilities |  | $ 11,765 |  |  |  |  |  |
Parent Company [Member] | Unsecured Revolving Convertible Note [Member] | Jelco [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Convertible Promissory Notes [Abstract] |  |  |  |  |  |  |  |
Tenor of note |  | 5 years |  |  |  |  |  |

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