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Employee Benefit Plans and Other Postretirement Benefits - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Minimum retirement age for medical benefit plan coverage, years | 58 |  |
Minimum service period for medical benefit plan coverage, years | 10 |  |
Employee age after which minimum service period to be completed for medical benefit plan coverage, years | 48 |  |
Minimum age at which the availability of medical coverage of retirees is curtailed | 65 |  |
Number of retirees affected by plan amendment | 50 |  |
Percentage determining the amount of unrecognized net gain or loss to be amortized | 10.00% |  |
Expected pension contributions in next fiscal year | $ 30,100,000 |  |
Expected pension plan expense in next fiscal year | 38,200,000 |  |
Pension Plans |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Prior service cost, expected to be realized | 6,200,000 |  |
Prior service cost, expected to be realized, net of tax | 3,800,000 |  |
Actuarial loss, expected to be realized | 6,000,000 |  |
Actuarial loss, expected to be realized, net of tax | 3,700,000 |  |
Company contributions | 35,984,000 | 22,158,000 | 15,214,000
Net periodic benefit cost | 36,025,000 | 25,930,000 | 25,131,000
Postretirement Plans |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Prior service cost, expected to be realized | (400,000) |  |
Prior service cost, expected to be realized, net of tax | (300,000) |  |
Actuarial loss, expected to be realized | 500,000 |  |
Actuarial loss, expected to be realized, net of tax | 300,000 |  |
Company contributions | 1,192,000 | 821,000 | 1,325,000
Net periodic benefit cost | 3,130,000 | 2,821,000 | 2,455,000
Defined Contribution Pension |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Company's contribution to defined contribution plans | 10,800,000 | 10,400,000 | 9,600,000
Retirement contribution expenses | $ 4,300,000 | $ 3,900,000 | $ 3,100,000
Employee Stock Ownership Plan |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Company's common stock | 2.1 | 2.6 |
Maximum |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Pactiv pension plan participation period, years | P5Y |  |
Maximum | Defined Contribution Pension |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Company's contribution to pension plan, percentage | 5.00% |  |
Minimum | Defined Contribution Pension |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
Company's contribution to pension plan, percentage | 3.00% |  |

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- Definition The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + 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 (s) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph s -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=21915506&loc=d3e1928-114920 + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + 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 (g) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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