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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