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Summary of Significant Accounting Policies Residual Values (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Net	$ 8,392,547,000	$ 8,923,451,000
Special Container Units [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Net	$ 321,099,000	322,607,000
Dry Container Units 20 Foot [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average	13 years
Property Subject to or Available for Operating Lease Net Salvage Value	$ 1,000
Dry Container Units 40 Foot [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average	13 years
Property Subject to or Available for Operating Lease Net Salvage Value	$ 1,200
Dry Container Units 40 Foot High Cube [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average	13 years
Property Subject to or Available for Operating Lease Net Salvage Value	$ 1,400
Refrigerated Container Units 20 Foot [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average	12 years
Property Subject to or Available for Operating Lease Net Salvage Value		2,350
Refrigerated Container Units 40 Foot High Cube [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average	12 years
Property Subject to or Available for Operating Lease Net Salvage Value		$ 3,350
Special Container Units 40 Foot Flat Rack [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average		16 years
Property Subject to or Available for Operating Lease Net Salvage Value		$ 1,700
Special Container Units 40 Foot Open Top [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average	16 years	16 years
Property Subject to or Available for Operating Lease Net Salvage Value	$ 2,300
Tank Container Units [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Net	$ 101,677,000	$ 107,284,000
Property Subject to or Available for Operating Lease Net Useful Life Average	20 years
Property Subject to or Available for Operating Lease Net Salvage Value	$ 3,000
Chassis [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Net	$ 140,986,000	150,669,000
Property Subject to or Available for Operating Lease Net Useful Life Average	20 years
Property Subject to or Available for Operating Lease Net Salvage Value	$ 1,200
Dry Container Units [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Net	6,308,038,000	6,666,560,000
Refrigerated Container Units [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease, Net	$ 1,520,747,000	1,676,331,000
Maximum [Member] | Refrigerated Container Units 20 Foot [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Salvage Value		2,500
Maximum [Member] | Refrigerated Container Units 40 Foot High Cube [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Salvage Value		$ 3,500
Maximum [Member] | Special Container Units 40 Foot Flat Rack [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average		14 years
Property Subject to or Available for Operating Lease Net Salvage Value		$ 3,000
Maximum [Member] | Special Container Units 40 Foot Open Top [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average		14 years
Property Subject to or Available for Operating Lease Net Salvage Value		$ 2,500
Minimum [Member] | Refrigerated Container Units 20 Foot [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Salvage Value		2,250
Minimum [Member] | Refrigerated Container Units 40 Foot High Cube [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Salvage Value		$ 3,250
Minimum [Member] | Special Container Units 40 Foot Flat Rack [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average		12 years
Property Subject to or Available for Operating Lease Net Salvage Value		$ 1,500
Minimum [Member] | Special Container Units 40 Foot Open Top [Member]
Property Subject to or Available for Operating Lease [Line Items]
Property Subject to or Available for Operating Lease Net Useful Life Average		12 years
Property Subject to or Available for Operating Lease Net Salvage Value		$ 2,300

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- Definition

The estimated or actual value of property subject to or available for operating lease at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose).

+ References

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- Definition

Useful life of property subject to or available for operating lease in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718

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