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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%