Consolidation Of Variable Interest Entities As A Non-Controlling Interest (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 item	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 item	Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items]
Total net book value	$ 754,000		$ 754,000		$ 945,000
Net book value	$ 1,740,878,000		$ 1,740,878,000		$ 1,564,777,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Number of types of container fund arrangements | item			2
Number of container portfolios sold | item	0	0	0	0
Total net book value	$ 156,900,000		$ 156,900,000
Net book value	78,200,000		78,200,000
Cash held by investor funds	50,500,000		50,500,000
Gain (loss) recognized on initial consolidation of VIEs			0
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	8,000,000		8,000,000
Variable Interest Entity, Primary Beneficiary [Member] | Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	$ 123,800,000		$ 123,800,000