Employee Benefit Plans - Additional Information (Details) $ in Thousands		12 Months Ended
	Dec. 19, 2025 USD ($)	Dec. 31, 2025 USD ($) plan	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Surplus plan assets	$ 446,000
Defined benefit plan, cash	13,000
Short-term bond fund	243,000
GPC stock	$ 190,000
Amortized cost		$ 244,000
Fair value, available-for-sale		243,000
Unrealized losses		$ 800
Amortization period of plan assets gains and losses (in years)		5 years
Benefit obligations		$ 453,719	$ 1,981,552	$ 1,981,783
Total accumulated benefit obligations		441,000	2,000,000
Fair value of assets		276,274	2,223,879	2,233,079
Dividend payments on Genuine Parts Company common stock received by plan		$ 6,000
Expected rate of return on plan assets for measuring next fiscal year pension cost or income		6.01%
Pension benefits expected to be paid from employer assets in next fiscal year		$ 16,000
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark		40.00%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark		50.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Passive portfolio benchmark		10.00%
Genuine Parts Company common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of assets		$ 0	176,640
United States
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations		$ 213,000	1,700,000
Fair value of assets			2,000,000
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		$ 80,000	75,000	77,000
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension settlement		742,000
Defined benefit plan, accumulated other comprehensive income (loss), actuarial losses, net of tax		541,000
Corporate Nonsegment
Defined Benefit Plan Disclosure [Line Items]
Pension settlement		$ 741,967	$ 0	$ 0