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Equity Incentive Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award          
Stock-based compensation expense $ 8,000 $ 8,000 $ 15,763 $ 13,659  
Stock Options [Abstract]          
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 51,000   $ 51,000    
Performance Based RSU [Member]          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 292,947   292,947   136,170
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 29.97   $ 29.97   $ 27.69
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 31.85    
RSUs [Abstract]          
RSUs granted, shares     164,152    
Stock Options [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number 292,947   292,947    
lkq_expected_to_vest_other_than_options_weighted_average_per_share $ 29.97   $ 29.97    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     2 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 7,675    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (7,375)    
RSUs forfeited/canceled, weighted average grant date fair value     $ 29.65    
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,872,129   1,872,129   1,612,026
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 31.90   $ 31.90   $ 31.72
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 31.71    
RSUs [Abstract]          
RSUs granted, shares     887,907    
Fair value of RSUs vested during the period     $ 17,000    
Stock Options [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number 1,660,511   1,660,511    
lkq_expected_to_vest_other_than_options_weighted_average_per_share $ 31.83   $ 31.83    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     3 years 1 month 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 43,505    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (77,143)    
RSUs forfeited/canceled, weighted average grant date fair value     $ 32.81    
Minimum [Member] | Stock options          
Stock Options [Abstract]          
Stock options expiration period     6 years    
Maximum | Restricted Stock Units (RSUs) [Member]          
Stock Options [Abstract]          
Vesting period     5 years    
Maximum | Performance Shares [Member]          
RSUs [Abstract]          
Reporting period of positive diluted earnings per share     5 years    
Maximum | Stock options          
Stock Options [Abstract]          
Vesting period     5 years    
Stock options expiration period     10 years