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Basis of Presentation and General Information, Subsidiaries in Consolidation - 20F (Details) | 9 Months Ended | 12 Months Ended
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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

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