Consolidation of Variable Interest Entities (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Variable Interest Entity [Line Items]
Net book value	$ 2,035,342,000		$ 2,102,839,000
Collateralized Financing Obligations [Member]
Variable Interest Entity [Line Items]
Long-term debt	82,200,000
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net book value	98,758,000		101,907,000
Cash	21,016,000	$ 27,058,000	$ 26,594,000	$ 25,211,000
Variable Interest Entity, Primary Beneficiary [Member] | Term Loan [Member]
Variable Interest Entity [Line Items]
Long-term debt	$ 35,200,000
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
Net book value	$ 103,400,000
Cash	21,000,000
Gain (loss) recognized on initial consolidation of VIEs	0
Book value of containers sold	$ 65,000,000
Number of containers sold | item	0