v2.4.0.8
Newbuilding Agreement - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 6 Months Ended
Apr. 08, 2013
Vessel
DWT
Jun. 30, 2013
Vessel
Property, Plant and Equipment [Line Items]    
Weight capacity in dead-weight tonnes 113,000  
Number of additional vessels 12  
Percentage of first installment   10.00%
Number of new building vessels   4
2013 [Member]
   
Property, Plant and Equipment [Line Items]    
New building agreement payments   $ 17.0
2014 [Member]
   
Property, Plant and Equipment [Line Items]    
New building agreement payments   8.5
2015 [Member]
   
Property, Plant and Equipment [Line Items]    
New building agreement payments   89.0
2016 [Member]
   
Property, Plant and Equipment [Line Items]    
New building agreement payments   $ 63.5