Subsequent Event (Details) (Lessees Exercise of an Early Buy-Out Option, USD $) In Millions, unless otherwise specified	1 Months Ended
	Jan. 31, 2012 ship
Lessees Exercise of an Early Buy-Out Option
Subsequent Event
Number of cargo ship leveraged leases on which the lessee has exercised its early buyout option	2
Pre-tax gain on exercise of early buy-out options	$ 3.5
After-tax gain on exercise of early buy-out options	$ 6.2