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Vessel Charters - Schedule of Estimated Minimum Hire Payments (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Charters-out [Member]
  
Capital Leases and Operating and Direct Finance Leases [Line Items]  
Operating leases, Remainder of 2013 $ 535.8
Operating leases, 2014 1,226.8
Operating leases, 2015 1,175.8
Operating leases, 2016 1,089.0
Operating leases, 2017 1,106.9
Direct financing leases, Remainder of 2013 25.0
Direct financing leases, 2014 48.7
Direct financing leases, 2015 47.8
Direct financing leases, 2016 48.0
Direct financing leases, 2017 42.9
Future minimum payments, Remainder of 2013 560.8
Future minimum payments, 2014 1,275.5
Future minimum payments, 2015 1,223.6
Future minimum payments, 2016 1,137.0
Future minimum payments, 2017 1,149.8
Charters-in [Member]
  
Capital Leases and Operating and Direct Finance Leases [Line Items]  
Operating leases, Remainder of 2013 42.7
Operating leases, 2014 40.7
Operating leases, 2015 15.9
Operating leases, 2016 9.1
Operating leases, 2017 9.1
Capital leases, Remainder of 2013 81.5
Capital leases, 2014 60.0
Capital leases, 2015 31.8
Capital leases, 2016 31.7
Capital leases, 2017 55.0
Future minimum payments, Remainder of 2013 124.2
Future minimum payments, 2014 100.7
Future minimum payments, 2015 47.7
Future minimum payments, 2016 40.8
Future minimum payments, 2017 $ 64.1