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Basis of Presentation - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Vessel operating expenses [Member]
       
Basis Of Presentation [Line Items]        
Amount reclassified from general and administration expenses $ 19.1 $ 19.4 $ 38.6 $ 40.0
Revenues [Member]
       
Basis Of Presentation [Line Items]        
Amount reclassified from general and administration expenses $ 7.3 $ 4.9 $ 13.8 $ 10.4