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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferred compensation liability | $ 12.4 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability | $ 12.0 us-gaap_DeferredCompensationArrangementWithIndividualRecordedLiability |
Employee Stock Ownership Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's common stock | 2.2 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = pkg_EmployeeStockOwnershipPlanMember | 2.1 us-gaap_EmployeeStockOwnershipPlanESOPSharesInESOP / us-gaap_EmployeeStockOwnershipPlanESOPDisclosuresByPlanAxis = pkg_EmployeeStockOwnershipPlanMember |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's contribution to pension plan, percentage | 3.00%pkg_CompanyRetirementContributionPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's contribution to pension plan, percentage | 5.00%pkg_CompanyRetirementContributionPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Matching Contributions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's contribution to defined contribution plans | 28.3 us-gaap_DefinedContributionPlanCostRecognized / pkg_A401KContributionsAxis = pkg_MatchingContributionsMember | 15.0 us-gaap_DefinedContributionPlanCostRecognized / pkg_A401KContributionsAxis = pkg_MatchingContributionsMember | 10.8 us-gaap_DefinedContributionPlanCostRecognized / pkg_A401KContributionsAxis = pkg_MatchingContributionsMember
Service Related Contributions |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's contribution to defined contribution plans | 7.4 us-gaap_DefinedContributionPlanCostRecognized / pkg_A401KContributionsAxis = pkg_ServiceRelatedContributionsMember | 5.3 us-gaap_DefinedContributionPlanCostRecognized / pkg_A401KContributionsAxis = pkg_ServiceRelatedContributionsMember | 4.3 us-gaap_DefinedContributionPlanCostRecognized / pkg_A401KContributionsAxis = pkg_ServiceRelatedContributionsMember
Postretirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum service period for medical benefit plan coverage, years | 10 pkg_MinimumServicePeriodForRetireeMedicalBenefitPlanCoverage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Minimum retirement age for medical benefit plan coverage, years | 58 pkg_MinimumRetirementAgeForRetireeMedicalBenefitPlanCoverage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Employee age after which minimum service period to be completed for medical benefit plan coverage, years | 48 pkg_EmployeeAgeAfterWhichMinimumServicePeriodToBeCompletedForRetireeMedicalBenefitPlanCoverage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |  |
Company contributions | $ 1.3 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | $ 1.3 us-gaap_DefinedBenefitPlanContributionsByEmployer / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |

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- Definition Represents the percentage of base pay for service-related Company retirement contributions to a defined contribution plan. + References No definition available. + Details
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- Definition Employee age after which minimum service period to be completed for retiree medical benefit plan coverage. + References No definition available. + Details
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- Definition Minimum retirement age for retiree medical benefit plan coverage. + References No definition available. + Details
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- Definition Minimum service period for retiree medical benefit plan coverage. + References No definition available. + Details
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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
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- Details
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- Details
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