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Vessel Charters - Schedules of Estimated Minimum Hire Payments (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Charters-out [Member]
  
Capital Leases and Operating and Direct Finance Leases [Line Items]  
Operating leases, Remainder of 2014 $ 624.0
Operating leases, 2015 1,438.8
Operating leases, 2016 1,231.4
Operating leases, 2017 1,225.1
Operating leases, 2018 997.2
Direct financing leases, Remainder of 2014 45.0
Direct financing leases, 2015 95.5
Direct financing leases, 2016 95.8
Direct financing leases, 2017 219.8
Direct financing leases, 2018 185.6
Future minimum payments, Remainder of 2014 669.0
Future minimum payments, 2015 1,534.3
Future minimum payments, 2016 1,327.2
Future minimum payments, 2017 1,444.9
Future minimum payments, 2018 1,182.8
Charters-in [Member]
  
Capital Leases and Operating and Direct Finance Leases [Line Items]  
Operating leases, Remainder of 2014 34.5
Operating leases, 2015 31.9
Operating leases, 2016 9.1
Operating leases, 2017 9.1
Operating leases, 2018 0.4
Capital leases, Remainder of 2014 42.4
Capital leases, 2015 31.8
Capital leases, 2016 31.7
Capital leases, 2017 55.0
Capital leases, 2018 51.3
Future minimum payments, Remainder of 2014 76.9
Future minimum payments, 2015 63.7
Future minimum payments, 2016 40.8
Future minimum payments, 2017 64.1
Future minimum payments, 2018 $ 51.7