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Employee benefit plans - Additional Information (Details) $ in Thousands	1 Months Ended	12 Months Ended			120 Months Ended
	Feb. 28, 2017	Dec. 31, 2019 USD ($) participant year	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) participant
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plans, accumulated benefit obligation		$ 1,959,010	$ 1,668,396		$ 1,959,010
Projected benefit obligation (PBO) with accumulated benefit obligations in excess of plan assets		1,658,018	1,397,040		1,658,018
Accumulated benefit obligation (ABO) with accumulated benefit obligations in excess of plan assets		1,651,740	1,391,129		1,651,740
Fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets		$ 1,341,556	1,013,173		1,341,556
Percentage of retiree health liability		96.00%
Projected contributions to retirement plan		$ 25,000			25,000
Total postretirement benefit plan assets		$ 1,696,401	1,329,751		$ 1,696,401
Sonoco Savings Plan
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan contribution percentage, Minimum		1.00%
Defined contribution plan contribution percentage, Maximum		100.00%
Percentage of participants modified matching contribution to be matched towards safe Harbor under companies savings plan					50.00%
Modify matching employee contribution to profit sharing under companies savings plan					4.00%
Companies expense related to the plan		$ 13,400	12,500	$ 11,200
Sonoco Investment and Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Projected contributions to retirement plan		23,000			$ 23,000
Companies expense related to the plan		$ 23,752	14,995	14,540
Contribution rate of annual eligible earnings under companies investment and retirement plan		4.00%
Contribution rate of annual eligible earnings in excess of social security wage base under companies investment and retirement plan		4.00%
Vesting period		3 years
Age limit of participants (year) \| year		55
Cash contributions to the SIRP		$ 14,573	14,151	14,066
Retiree Health and Life Insurance Plans
Defined Benefit Plan Disclosure [Line Items]
Cash withdrawn from a collectively bargained VEBA			14,025
Total postretirement benefit plan assets		12,881	10,919	27,177	12,881
Company contributions		682	(13,302)
Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Total postretirement benefit plan assets		1,683,520	1,318,832	1,494,713	1,683,520
Company contributions		215,979	24,524
Retirement Plan \| Inactive Plan Investment Portfolio
Defined Benefit Plan Disclosure [Line Items]
Projected contributions to retirement plan		150,000			150,000
Expected settlement charge		$ 600,000			$ 600,000
Number of participants \| participant		11,000			11,000
Retirement Plan \| Active Plan Investment Portfolio
Defined Benefit Plan Disclosure [Line Items]
Number of participants \| participant		600			600
United States
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on postretirement benefit obligation		$ 124
Effect of one percentage point increase of health care cost trend rate on total of service and interest cost		12
Effect of one percentage point decrease on postretirement benefit obligation		115
Effect of one percentage point decrease of health care cost trend rate on total of service and interest cost		11
United States \| Retiree Health and Life Insurance Plans
Defined Benefit Plan Disclosure [Line Items]
Total postretirement benefit plan assets		1,322,822			$ 1,322,822
United States \| Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Non-cash settlement charges				$ 32,761
Terminated vested participants, percentage	15.00%
Election rates, percentage	47.00%
Company contributions		$ 200,000
United States \| Retirement Plan \| Debt securities \| Inactive Plan Investment Portfolio
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		97.00%			97.00%
United States \| Retirement Plan \| Debt securities \| Active Plan Investment Portfolio
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		97.00%			97.00%
United States \| Retirement Plan \| Cash and short-term investments \| Inactive Plan Investment Portfolio
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		3.00%			3.00%
United States \| Retirement Plan \| Cash and short-term investments \| Active Plan Investment Portfolio
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		3.00%			3.00%
U.K. \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		42.00%			42.00%
U.K. \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		58.00%			58.00%
Canada \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		55.00%			55.00%
Canada \| Debt securities
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		44.00%			44.00%
Canada \| Cash and short-term investments
Defined Benefit Plan Disclosure [Line Items]
Current target allocation for investment portfolio		1.00%			1.00%
Canada \| Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Non-cash settlement charges		$ 2,377	$ 730