Consolidation of Variable Interest Entities (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($) item	Jun. 30, 2020 USD ($) item	Jun. 30, 2019 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Net book value	$ 1,978,826,000		$ 1,978,826,000		$ 2,102,839,000
Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	82,300,000		82,300,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net book value	90,865,000		90,865,000		101,907,000
Cash	27,703,000	$ 35,105,000	27,703,000	$ 35,105,000	$ 26,594,000	$ 25,211,000
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	$ 33,900,000		$ 33,900,000
Variable Interest Entity, Primary Beneficiary [Member] | Containers [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
Net book value	$ 95,000,000.0		$ 95,000,000.0
Cash	$ 27,700,000		27,700,000
Gain (loss) recognized on initial consolidation of VIEs			$ 0
Book value of containers sold		$ 65,000,000.0		$ 65,000,000.0
Number of containers sold | item	0		0