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Subsequent events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 t | Dec. 31, 2012 Vessel | Jun. 30, 2011 | Dec. 31, 2013 DVB Bank Loan Facility [Member] | Dec. 31, 2013 Ardmore Seavantage January 2014 [Member] Imo t | Dec. 31, 2013 Ardmore Seavanguard February 2014 [Member] Imo t | Jan. 15, 2014 Subsequent Event [Member] | Jan. 17, 2014 Subsequent Event [Member] DVB Bank Loan Facility [Member] | Jan. 23, 2014 Subsequent Event [Member] Senior Debt Facility [Member] Vessel | Jan. 07, 2014 Subsequent Event [Member] Ardmore Seamariner October 2006 [Member] t | Jan. 17, 2014 Subsequent Event [Member] Ardmore Seavantage January 2014 [Member] Imo | Feb. 11, 2014 Subsequent Event [Member] Ardmore Seavanguard February 2014 [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Carrying capacity of Vessel | 823,804 |  |  |  | 49,997 | 49,998 |  |  |  | 45,726 |  |
IMO product and chemical tanker |  |  |  |  | 3 | 3 |  |  |  |  | 3 |
Number of vessels under construction |  | 12 |  |  |  |  |  |  | 8 |  |  |
Time charter employment period of vessels |  |  |  |  |  |  |  |  |  | 3 months | 1 year |
Cash dividend declared date |  |  |  |  |  |  | Jan. 15, 2014 |  |  |  |  |
Cash dividend declared (in dollars per share) |  |  |  |  |  |  | $ 0.10 |  |  |  |  |
Cash dividend to be paid, date |  |  |  |  |  |  | Feb. 14, 2014 |  |  |  |  |
Debt drawn under loan facility |  |  | $ 32.40 | $ 36.85 |  |  |  | $ 22.50 |  |  |  |
Remaining borrowing capacity |  |  |  | 45.0 |  |  |  |  |  |  |  | 22.5
Senior debt facility |  |  |  | $ 81.85 |  |  |  |  | $ 172.00 |  |  |
Variable rate basis |  |  |  | LIBOR |  |  |  |  | LIBOR |  |  |
Basis spread on variable rate (in hundredths) |  |  |  | 3.75% |  |  |  |  | 3.15% |  |  |

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- Definition Pertains to the IMO (International Maritime Organization) product and chemical tanker. + References No definition available. + Details
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