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Basis of Presentation and General Information, Subsidiaries in Consolidation - 20F (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Subsidiaries in Consolidation [Abstract]    
Country of incorporation Republic of the Marshall Islands Republic of the Marshall Islands
Date of incorporation Jan. 04, 2008 Jan. 04, 2008
Seanergy Management Corp. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [1],[2] Marshall Islands Marshall Islands
Date of incorporation [1],[2] May 09, 2008 May 09, 2008
Seanergy Shipmanagement Corp. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [1],[2] Marshall Islands Marshall Islands
Date of incorporation [1],[2] Sep. 16, 2014 Sep. 16, 2014
Sea Glorius Shipping Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Sep. 16, 2014 Sep. 16, 2014
Vessel name Gloriuship Gloriuship
Date of delivery Nov. 03, 2015 Nov. 03, 2015
Financier of vessel HSH Nordbank AG HSH Nordbank AG
Sea Genius Shipping Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Sep. 16, 2014 Sep. 16, 2014
Vessel name Geniuship Geniuship
Date of delivery Oct. 13, 2015 Oct. 13, 2015
Financier of vessel HSH Nordbank AG HSH Nordbank AG
Leader Shipping Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Jan. 15, 2015 Jan. 15, 2015
Vessel name Leadership Leadership
Date of delivery Mar. 19, 2015 Mar. 19, 2015
Financier of vessel Alpha Bank A.E. Alpha Bank A.E.
Premier Marine Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Jul. 09, 2015 Jul. 09, 2015
Vessel name Premiership Premiership
Date of delivery Sep. 11, 2015 Sep. 11, 2015
Financier of vessel UniCredit Bank AG UniCredit Bank AG
Gladiator Shipping Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Jul. 09, 2015 Jul. 09, 2015
Vessel name Gladiatorship Gladiatorship
Date of delivery Sep. 29, 2015 Sep. 29, 2015
Financier of vessel UniCredit Bank AG UniCredit Bank AG
Guardian Shipping Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Jul. 09, 2015 Jul. 09, 2015
Vessel name Guardianship Guardianship
Date of delivery Oct. 21, 2015 Oct. 21, 2015
Financier of vessel UniCredit Bank AG UniCredit Bank AG
Champion Ocean Navigation Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Liberia Liberia
Date of incorporation [2] Aug. 06, 2015 Aug. 06, 2015
Vessel name Championship Championship
Date of delivery Dec. 07, 2015 Dec. 07, 2015
Financier of vessel Natixis Natixis
Squire Ocean Navigation Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Liberia Liberia
Date of incorporation [2] Aug. 06, 2015 Aug. 06, 2015
Vessel name Squireship Squireship
Date of delivery Nov. 10, 2015 Nov. 10, 2015
Financier of vessel Alpha Bank A.E. Alpha Bank A.E.
Pembroke Chartering Services Limited [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [3] Malta Malta
Date of incorporation [3] Dec. 02, 2015 Dec. 02, 2015
Amazons Management Inc. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Apr. 21, 2008 Apr. 21, 2008
Vessel name Davakis G. Davakis G.
Date of delivery Aug. 28, 2008 Aug. 28, 2008
Date of sale/disposal Mar. 06, 2014 Mar. 06, 2014
Financier of vessel Piraeus Bank Piraeus Bank
Lagoon Shipholding Ltd. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Apr. 21, 2008 Apr. 21, 2008
Vessel name Delos Ranger Delos Ranger
Date of delivery Aug. 28, 2008 Aug. 28, 2008
Date of sale/disposal Mar. 11, 2014 Mar. 11, 2014
Financier of vessel Piraeus Bank Piraeus Bank
Cynthera Navigation Ltd. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Mar. 18, 2008 Mar. 18, 2008
Vessel name African Oryx African Oryx
Date of delivery Aug. 28, 2008 Aug. 28, 2008
Date of sale/disposal Apr. 10, 2013 Apr. 10, 2013
Financier of vessel Piraeus Bank Piraeus Bank
Martinique International Corp. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] British Virgin Islands British Virgin Islands
Date of incorporation [2] May 14, 2008 May 14, 2008
Vessel name Bremen Max Bremen Max
Date of delivery Sep. 11, 2008 Sep. 11, 2008
Date of sale/disposal Mar. 07, 2014 Mar. 07, 2014
Financier of vessel Piraeus Bank Piraeus Bank
Harbour Business International Corp. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] British Virgin Islands British Virgin Islands
Date of incorporation [2] Apr. 01, 2008 Apr. 01, 2008
Vessel name Hamburg Max Hamburg Max
Date of delivery Sep. 25, 2008 Sep. 25, 2008
Date of sale/disposal Mar. 10, 2014 Mar. 10, 2014
Financier of vessel Piraeus Bank Piraeus Bank
Waldeck Maritime Co. [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Marshall Islands Marshall Islands
Date of incorporation [2] Apr. 21, 2008 Apr. 21, 2008
Vessel name African Zebra African Zebra
Date of delivery Sep. 25, 2008 Sep. 25, 2008
Date of sale/disposal Feb. 15, 2012 Feb. 15, 2012
Financier of vessel Piraeus Bank Piraeus Bank
Maritime Capital Shipping Limited [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [2] Bermuda Bermuda
Date of incorporation [2] Apr. 30, 2007 Apr. 30, 2007
Maritime Capital Shipping (HK) Limited [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [1] Hong Kong Hong Kong
Date of incorporation [1] Jun. 16, 2006 Jun. 16, 2006
Maritime Glory Shipping Limited [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation British Virgin Islands [4] British Virgin Islands [5]
Date of incorporation Apr. 08, 2008 [4] Apr. 08, 2008 [5]
Vessel name Clipper Glory Clipper Glory
Date of delivery May 21, 2010 May 21, 2010
Date of sale/disposal Dec. 04, 2012 Dec. 04, 2012
Financier of vessel HSBC HSBC
Maritime Grace Shipping Limited [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation British Virgin Islands [4] British Virgin Islands [5]
Date of incorporation Apr. 08, 2008 [4] Apr. 08, 2008 [5]
Vessel name Clipper Grace Clipper Grace
Date of delivery May 21, 2010 May 21, 2010
Date of sale/disposal Oct. 15, 2012 Oct. 15, 2012
Financier of vessel HSBC HSBC
Atlantic Grace Shipping Limited [Member]    
Subsidiaries in Consolidation [Abstract]    
Country of incorporation [6] British Virgin Islands British Virgin Islands
Date of incorporation [6] Oct. 09, 2007 Oct. 09, 2007
[1] Management company
[2] Subsidiaries wholly owned
[3] Chartering services company
[4] Vessel owning subsidiaries owned by Maritime Capital Shipping Limited (or "MCS")
[5] Vessel owning subsidiaries owned by MCS
[6] Dormant company