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Income Taxes - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 21, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |
Change in enacted rate |  |  |  | $ 0 | $ 0
Change in tax rate, deferred tax asset, provisional income tax expense |  |  | $ 245,200,000 |  |
Federal statutory rate | 21.00% | 35.00% |  | 35.00% | 35.00%
One time transition tax |  |  | 38,100,000 |  |
Adjustment to operating loss carryforwards, domestic |  |  | 900,000 |  |
Adjustment to operating loss carryforwards, state and local |  |  | 4,000,000 |  |
Deferred tax assets unutilized for net operating losses |  |  | 28,500,000 |  |
Uncertainty in income tax positions |  |  | 200,000 |  |
Deferred tax assets for federal alternative minimum tax |  |  | 4,200,000 |  |
Deferred tax assets for foreign NOL carryforwards |  |  | 3,900,000 |  |
Carryforwards not subject to expiration |  |  | 1,700,000 |  |
Deferred tax assets associated operating loss carryforwards not subject to expiration |  |  | 300,000 |  |
Valuation allowance against deferred tax assets |  |  | 7,600,000 | $ 4,500,000 |
Deferred tax assets, net |  |  | 80,200,000 | 133,400,000 |
Change in income tax expense (benefit) |  |  | (202,200,000) |  |
Penalties and interest |  |  | 0 | 0 | $ 0
Federal |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Change in enacted rate |  |  | (207,100,000) | 7,300,000 |
Operating loss carryforwards |  |  | 136,100,000 |  |
State |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Change in enacted rate |  |  | 13,500,000 |  |
Deferred tax assets, net operating loss carry forwards |  |  | 14,100,000 |  |
Foreign |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | 16,300,000 |  |
NOL subject to expiration |  |  | 14,600,000 |  |
Deferred tax assets associated with operating loss carryforwards subject to expiration |  |  | 3,600,000 |  |
United States | Federal |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Operating loss carryforwards |  |  | 28,700,000 |  |
New Hertz |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax liability |  |  | $ 200,000 | $ 200,000 |

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