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Long-Term Debt, Secured Credit Facilities - 20F (Details) $ in Thousands													9 Months Ended		12 Months Ended
	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
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
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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- Definition

The number of consecutive, periodic payment installments in which the debt is to be repaid.

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The number of facilities guaranteed by Seanergy Maritime Holdings Corp., the Corporate Guarantor.

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The number of vessels secured by a first priority mortgage.

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At any relevant time during the Security Period, the first threshold ratio (expressed as a percentage) of the aggregate Market Value of the Ships then subject to a Mortgage plus the net realisable value of any additional Security previously provided under Clause 25 (Security Cover) to the aggregate of the Loan and the cost (if any) of terminating any transactions entered into under the Hedging Agreement, as determined by the Lender pursuant to Clause 25.1 (Minimum required security cover).

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At any relevant time during the Security Period, the second threshold ratio (expressed as a percentage) of the aggregate Market Value of the Ships then subject to a Mortgage plus the net realisable value of any additional Security previously provided under Clause 25 (Security Cover) to the aggregate of the Loan and the cost (if any) of terminating any transactions entered into under the Hedging Agreement, as determined by the Lender pursuant to Clause 25.1 (Minimum required security cover).

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Period of time cash and marketable securities are equal or greater than the amount required to meet the Company's consolidated installment and debt interest payments for purposes of distributing dividends, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of the required periodic payments applied to principal.

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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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Amount of the fee for available but unused credit capacity under the credit facility.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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