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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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- Definition

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

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

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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 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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