Employee Benefit Plans - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) plan	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Amortization period of plan assets gains and losses (in years)	5 years
Benefit obligations	$ 1,981,783	$ 1,923,163	$ 2,532,973
Total accumulated benefit obligations	2,000,000	1,900,000
Actuarial loss (gain)	76,072	(546,266)
Actual return on plan assets	217,767	(493,359)
Fair value of plan assets	$ 2,233,079	$ 2,129,058	2,756,803
Genuine Parts Company common stock as a percentage of total plan assets	9.00%	12.00%
Dividend payments on Genuine Parts Company common stock received by plan	$ 6,000	$ 5,000
Expected rate of return on plan assets for measuring next fiscal year pension cost or income	7.61%
Pension benefits expected to be paid from employer assets in next fiscal year	$ 13,000
US Large-Cap Stocks
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark	38.00%
US Mid-Cap Stocks
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark	4.00%
International Stocks
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark	10.00%
Emerging Market Stock
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark	3.00%
BarCap U.S. Govt/Credit
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark	40.00%
US Small-cap Stocks
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark	5.00%
UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations	$ 1,700,000	1,700,000
Actuarial loss (gain)	(4,800)
Fair value of plan assets	$ 2,000,000	1,900,000
Number of plans | plan	1
Matching contribution to be received by pension plan participants of a specified percentage of employee's salary	100.00%
First percentage of employee's salary out of which matching contribution will be made	5.00%
Total defined contribution plans expense	$ 77,000	$ 69,000	$ 60,000
UNITED STATES | U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	50,000
Actual return on plan assets	47,000
UNITED STATES | U.S. Supplemental Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain)	20,000
Loss from discount rate change	5,000
Demographic loss	11,200
Loss related to expected incentive payouts	$ 8,500