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Income Taxes - Schedule of Effective Tax Rates (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
U.S. federal taxes at statutory rate | 21.00% | 21.00% | 21.00%
State taxes, net of federal benefit | 22.10% | 7.70% | 7.50%
Nondeductible expenses | 1.40% | 0.50% | 0.30%
Stock compensation | 7.30% | 2.80% | 0.30%
Foreign rate differential | (0.10%) | (0.10%) | (0.20%)
Federal and state credits | (9.50%) | (4.70%) | (2.60%)
Disallowed officer compensation | 0.40% | 0.80% | 1.00%
Investment in partnership | 4.70% | 1.00% | (0.30%)
Federal, state, and foreign provision to return differences | (1.40%) | (0.80%) | (0.70%)
Uncertain tax provision | 0.40% | 0.50% |
CarOffer and AutoList M&A | 2.90% |  |
Other | 0.00% | 0.00% | (0.20%)
Consolidated effective tax rate | 49.20% | 28.70% | 26.10%
Effective tax rate attributable to redeemable noncontrolling interest | (4.70%) | (1.00%) | 0.20%
Effective tax rate attributable to CarGurus, Inc | 44.50% | 27.70% | 26.30%

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