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Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details) | 12 Months Ended
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Dec. 31, 2023
Property Plant And Equipment [Line Items] |
Leasehold improvements | Period of thelease or usefullife, if shorter
Minimum | Buildings And Land Improvements |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 5 years
Minimum | Machinery and Equipment |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 3 years
Minimum | Trucks and Automobiles |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 3 years
Minimum | Furniture and Fixtures |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 3 years
Minimum | Computers and Hardware |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 3 years
Maximum | Buildings And Land Improvements |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 40 years
Maximum | Machinery and Equipment |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 25 years
Maximum | Trucks and Automobiles |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 10 years
Maximum | Furniture and Fixtures |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 20 years
Maximum | Computers and Hardware |
Property Plant And Equipment [Line Items] |
Estimated useful life of asset (in years) | 10 years

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- Definition Leasehold improvements + References No definition available. + Details
Name: | pkg_LeaseholdImprovements
Namespace Prefix: | pkg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=pkg_BuildingsAndLandImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_TechnologyEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |