Consolidation of Variable Interest Entities as a Non-Controlling Interest (Details) (USD $)	3 Months Ended		6 Months Ended			1 Months Ended	6 Months Ended		9 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Fund	Jun. 30, 2012	Dec. 31, 2012	Sep. 30, 2010 Variable Interest Entity, Primary Beneficiary [Member]	Jun. 30, 2013 Variable Interest Entity, Primary Beneficiary [Member]	Jun. 30, 2012 Variable Interest Entity, Primary Beneficiary [Member]	Sep. 30, 2012 Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of specific Japanese funds			2
Net proceeds from sale of equipment portfolios	$ 0	$ 0	$ 0	$ 10,320,000				$ 10,320,000
Gain on sale of equipment portfolios	0	0	0	1,256,000				1,256,000
Containers transferred to specific Japanese funds						16,000,000
Cash									15,300,000
Fair value of net investment in direct finance leases	77,083,000		77,083,000		85,554,000				4,200,000
Non-controlling interest									19,500,000
Gain or loss recognized upon the initial consolidation									0
Net income attributable to non-controlling interest	0	513,000	0	578,000
Sale and leaseback transaction of containers							85,000,000
Net book value of containers transferred	1,657,000		1,657,000		1,847,000		78,700,000
Cash held by investor funds							10,200,000
Collateralized financing obligations	$ 1,067,488,000		$ 1,067,488,000		$ 888,990,000		$ 95,200,000