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Income Taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Line Items] |  |  |
Effective tax rate attributable to CarGurus, Inc | 44.50% | 27.70% | 26.30%
Change in valuation allowance | $ 47 | $ 29 |
Deferred tax assets, federal net operating loss carryforwards | 277 |  |
Deferred tax assets, state net operating loss carryforwards | $ 3,442 |  |
Percentage of annual limitation of taxable income | 80.00% |  |
Statutory tax rate | 21.00% | 21.00% | 21.00%
Liabilities for uncertain tax positions | $ 812 | $ 598 | $ 0
Federal |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforwards | $ 673 |  |
State |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards expiration year | 2040 |  |
Tax credit carryforwards | $ 322 |  |
Internal Revenue Service (IRS) |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward limitations on use, cumulative ownership change, period | 3 years |  |
Tax credit carryforward, limitations on use | an ownership change, as defined by Section 382, results from transactions that increase the ownership of 5% stockholders in the stock of a corporation by more than 50% in the aggregate over a three-year period. |  |
Open tax year | 2019 |  |
Internal Revenue Service (IRS) | Maximum |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward limitations on use, cumulative ownership change percentage | 50.00% |  |
Revenue Commissioners, Ireland | Foreign |  |  |
Income Tax Disclosure [Line Items] |  |  |
Open tax year | 2017 |  |

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