v2.4.0.8
Operating Leases - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Fixed Rate Time Charter Contract [Member]
Vessel
Dec. 31, 2013
Two Thousand and Fourteen Expiration [Member]
Vessel
Dec. 31, 2013
Two Thousand And Fifteen Time Charter Contract Expiration [Member]
Vessel
Dec. 31, 2013
Two Thousand And Sixteen Time Charter Contract Expiration [Member]
Vessel
Operating Leased Assets [Line Items]            
Minimum commitment to be incurred by Company $ 4.4          
Minimum commitment to be incurred by Company, 2015 0.2          
Number of vessels     13 6 4 3
Minimum scheduled future revenues to be received by Company 113.3          
Minimum scheduled future revenues to be received by Company in current year 72.4          
Minimum scheduled future revenues to be received by Company in second year 32.7          
Minimum scheduled future revenues to be received by Company in third year 8.2          
Carrying amount of vessels employed on operating leases 431.1 455.9        
Cost of the veseels 598.1 645.6        
Accumulated depreciation of the vessels $ 167.0 $ 189.7