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Equity Incentive Plans - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award          
Stock-based compensation expense $ 7,000 $ 7,000 $ 22,851 $ 20,837  
Stock Options [Abstract]          
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount $ 44,000   $ 44,000    
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     1 year 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 8,123    
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 1,542,592   1,542,592   1,612,026
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 31.74   $ 31.74   $ 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     $ 31.67    
RSUs [Abstract]          
RSUs granted, shares     901,215    
Fair value of RSUs vested during the period     $ 26,000    
Stock Options [Abstract]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected To Vest, Number 1,344,073   1,344,073    
lkq_expected_to_vest_other_than_options_weighted_average_per_share $ 31.65   $ 31.65    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms     2 years 10 months 24 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested     $ 37,271    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period     (87,071)    
RSUs forfeited/canceled, weighted average grant date fair value     $ 32.79    
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