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Summary of Significant Accounting Policies - Other Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2019
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net Cash Provided by (Used in) Financing Activities |  |  |  |  |  |  |  |  | $ (1,028,753,000) | $ 351,927,000 | $ 567,275,000 |
Net gain (loss) on sale of leasing equipment | $ 4,857,000 | $ 6,196,000 | $ 7,519,000 | $ 8,469,000 | $ 7,999,000 | $ 7,055,000 | $ 11,105,000 | $ 9,218,000 | $ 27,041,000 | $ 35,377,000 | $ 35,812,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 867 | 207,991 | 0 |
Provision (reversal) for doubtful accounts |  |  |  |  |  |  |  |  | $ 590,000 | $ (231,000) | $ 3,347,000 |
Operating Lease, Liability | 8,940,000 |  |  |  |  |  |  |  | 8,940,000 |  |  | $ 10,500,000
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  | $ 8,900,000
Proceeds from Sale and Collection of Finance Receivables |  |  |  |  |  |  |  |  | 73,429,000 | 64,372,000 | 60,673,000 |
Long Lived Assets Held-for-sale, Name [Domain] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale of leasing equipment |  |  |  |  |  |  |  |  | (5,299,000) | (3,933,000) | 3,000 |
Equipment, net of selling costs [Member] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net gain (loss) on sale of leasing equipment |  |  |  |  |  |  |  |  | 32,340,000 | 39,310,000 | 35,809,000 |
Refrigerated Container Units 20 Foot [Member] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease Net Salvage Value |  |  |  |  | $ 2,350 |  |  |  |  | 2,350 |  |
Dry Container Units 40 Foot [Member] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease Net Salvage Value | 1,200 |  |  |  |  |  |  |  | 1,200 |  |  |
Dry Container Units 40 Foot High Cube [Member] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property Subject to or Available for Operating Lease Net Salvage Value | 1,400 |  |  |  |  |  |  |  | 1,400 |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale and Collection of Finance Receivables |  |  |  |  |  |  |  |  |  | $ 64,400,000 | $ 60,700,000 |
Triton Container Investments LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Impairment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Operating Partnerships | $ 103,000,000.0 |  |  |  |  |  |  |  | 103,000,000.0 |  |  |
Proceeds from Noncontrolling Interests |  |  |  |  |  |  |  |  | $ 16,900,000 |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 56.00% |  |  |  |  | 56.00% |  |

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