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Stock-based Compensation - Additional Information (Details) - USD ($)
 12 Months Ended
Jan. 02, 2024
Nov. 07, 2023
Jan. 03, 2023
Jan. 03, 2022
Aug. 22, 2016
Aug. 15, 2015
Jun. 26, 2015
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Nov. 30, 2023
Dec. 08, 2022
Dec. 31, 2020
Oct. 16, 2017
Jun. 21, 2017
Dec. 31, 2006
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Stock-based compensation expense               $ 113,456,000 $ 33,682,000 $ 77,710,000            
Capitalized website development and internal-use software costs excluded from stock-based compensation expense               5,472,000 4,468,000 3,247,000            
Income tax benefit from stock-based compensation expense               5,353,000 5,441,000 5,301,000            
Employee tax withholding requirements for net share settlements of equity awards               15,729,000 16,025,000 15,388,000            
Payment of withholding taxes on net share settlements of restricted stock units               $ 15,597,000 16,022,000 15,388,000            
Number of shares repurchased and retired               11,076,755                
Share repurchased and retired, value               $ 204,127,000                
Share repurchased and retired at average cost price per share               $ 18.43                
Redeemable noncontrolling interest               $ 0 $ 36,749,000 $ 162,808,000     $ 0      
Deemed dividend on redemption of noncontrolling interest               $ 5,838,000                
Share repurchase program effective date   Jan. 01, 2024                            
Share repurchase program expiration date   Dec. 31, 2024                            
Employee Stock Option                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of options granted in period               0 30,266 619,618            
Aggregate intrinsic value for options exercised               $ 229,000 [1] $ 3,774,000 $ 6,027,000            
Unrecognized stock-based compensation expense related to unvested stock options               $ 2,623,000                
Unrecognized stock-based compensation expense, expected period for recognition               1 year 3 months 18 days                
Stock-based compensation expense               $ 2,386,000 $ 2,553,000 $ 2,471,000            
RSUs                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of units granted in period               4,133,865                
Unvested units               5,687,711 4,484,291              
Weighted average grant date fair value of RSUs granted               $ 17.47 $ 28.94 $ 33.83            
Number of RSUs vested and settled during period                 1,649,294 1,575,206            
Total fair value of RSUs vested                 $ 55,136,000 $ 52,423,000            
Unrecognized stock-based compensation expense related to RSUs               $ 108,714,000                
Unrecognized stock-based compensation expense, expected period for recognition               2 years 6 months                
Stock-based compensation expense               $ 55,527,000 52,224,000 52,916,000            
Number of units vested in period               2,440,510                
Number of units forfeited in period               489,935                
CO Incentive Units and Subject Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Stock-based compensation expense               $ 26,552,000 $ (21,095,000) $ 22,323,000            
(Increase) decrease in stock-based compensation expense               (47,647,000)                
Noncontrolling Interest Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Stock-based compensation expense               28,991,000                
(Increase) decrease in stock-based compensation expense               $ 28,991,000                
Class A Common Stock                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Employee tax withholding requirements and option costs due to net share settlement               840,995 566,267 527,237            
Class A Common Stock | Maximum                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Aggregate share repurchase price   $ 250,000,000                   $ 250,000,000        
2020 CO Plan | Incentive Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances               485,714                
Number of units granted in period               0                
Number of shares available for issuance during period               0                
Accelerated and redeemed units               142,857                
Unvested units               0 342,857              
Unrecognized stock based compensation expense related to unvested units               $ 0                
Stock-based compensation expense                   $ 1,229,000            
Number of units vested in period               0                
Number of units forfeited in period               0                
2020 CO Plan | Subject Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Unrecognized stock based compensation expense related to unvested units               $ 0                
Vesting Agreement | Subject Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Stock options, granted               0 0              
Number of shares available for issuance during period               0                
Units issued and unvested               0 288,395              
Number of units vested in period               0 144,197              
Number of units forfeited in period               0 0              
2021 CO Plan                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                     228,571          
2021 CO Plan | Incentive Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances               228,571                
Number of shares available for issuance during period               0                
2021 CO Plan | Subject Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares available for issuance during period               0                
2006 Plan                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Stock options, granted             0                  
Number of units granted in period             0                  
2006 Plan | Class B Common Stock                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                               3,444,668
2015 Plan                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances             603,436                  
Term of authorized shares           10 years                    
Award expiration date         Aug. 21, 2026                      
Equity Incentive Plan, plan modification, description and terms               (1) the number of shares of Class A common stock was increased, on a share for share basis, by the number of shares of Class B common stock that were (a) subject to outstanding options granted under the 2006 Plan that expired, terminated, or were canceled for any reason without having been exercised, (b) surrendered in payment of the exercise price of outstanding options granted under the 2006 Plan, or (c) withheld in satisfaction of tax withholding upon exercise of outstanding options granted under the 2006 Plan, and the number of shares of Class B common stock reserved under the amended and restated 2015 Plan was decreased, on a corresponding share for share basis, (2) no new awards of Class B common stock could be granted under the amended and restated 2015 Plan, and (3) except with respect to outstanding options granted under the 2006 Plan that were exercised on or after the date of the amendment and restatement, no Class B common stock could be issued under the 2015 Plan.                
2015 Plan | Class B Common Stock                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                             5,161,644  
Number of additional shares authorized         802,562                      
2015 Plan | Class B Common Stock | Employee Stock Option                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares called by each instrument                             4  
2015 Plan | Class B Common Stock | RSUs                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares called by each instrument                             4  
2015 Plan | Class A Common Stock                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                             3,181,740  
Number of additional shares authorized         618,691                      
2015 Plan | Class A Common Stock | Employee Stock Option                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares called by each instrument                             2  
2015 Plan | Class A Common Stock | RSUs                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares called by each instrument                             2  
2017 Plan                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of additional shares authorized     4,065,466 4,070,921       6,000,000                
Equity incentive plan, issuance of additional shares, description and terms               Unless determined otherwise by the Compensation Committee of the Board, as of the first trading day of January of each calendar year during the term of the 2017 Plan (excluding any extensions), eligible beginning with calendar year 2019, an additional number of shares of Class A common stock will be added to the number of shares of the Company’s Class A common stock authorized to be issued or transferred under the 2017 Plan and the number of shares authorized to be issued or transferred pursuant to incentive stock options, equal to 4% of the total number of shares of Class A common stock outstanding on the last trading day in December of the immediately preceding calendar year, or 6,000,000 shares, whichever is less, or such lesser amount as determined by the Board (the “Evergreen Increase”). The Compensation Committee of the Board determined to not effectuate the Evergreen Increase that was otherwise scheduled to have occurred on each of January 2, 2019, January 2, 2020, and January 4, 2021. On January 3, 2022, an additional 4,070,921 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. On January 3, 2023, an additional 4,065,466 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase. On January 2, 2024, an additional 3,687,010 shares of the Company's Class A Common Stock was authorized to be issued or transferred under the 2017 Plan pursuant to the Evergreen Increase.                
2017 Plan | Subsequent Event                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of additional shares authorized 3,687,010                              
2017 Plan | Class A Common Stock                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Equity incentive plan, additional shares authorized percentage               4.00%                
Number of shares available for issuance during period               6,236,628                
2017 Plan | Class A Common Stock | Maximum                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                           12,300,000    
2017 Plan | Class A Common Stock | Awarded Under 2017 Plan                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                           7,800,000    
2017 Plan | Class A Common Stock | Awarded Under 2015 Plan                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Number of shares authorized for issuances                           4,500,000    
2023 CarOffer Transaction | CO Incentive Units and Subject Units                                
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]                                
Stock-based compensation expense               $ 20,655,000                
[1] As of December 31, 2023 and 2022, the aggregate intrinsic value was calculated based on the positive difference, if any, between the estimated fair value of common stock on December 31, 2023 and 2022, respectively, or the date of exercise, as appropriate, and the exercise price of the underlying options.