Information Regarding Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Field Packaging Group
Business Acquisition [Line Items]
Business acquisition date	Apr. 14, 2011
Business acquisition, cost of acquired entity	$ 26,942
Purchase price allocation to goodwill	11,459
Packaging Materials Company
Business Acquisition [Line Items]
Business acquisition date	Sep. 10, 2011
Business acquisition, cost of acquired entity	8,602
Purchase price allocation to goodwill	1,490
Colorado Container
Business Acquisition [Line Items]
Business acquisition date	Nov. 30, 2011
Business acquisition, cost of acquired entity	21,796
Purchase price allocation to goodwill	5,782
Packaging Specialists
Business Acquisition [Line Items]
Business acquisition date	Mar. 16, 2012
Business acquisition, cost of acquired entity	35,393
Purchase price allocation to goodwill	9,576
Customer Relationships
Business Acquisition [Line Items]
Intangible asset, useful life, in years	16 years 8 months 12 days
Customer Relationships \| Field Packaging Group
Business Acquisition [Line Items]
Purchase price allocation to intangible assets	9,520
Intangible asset, useful life, in years	10 years
Customer Relationships \| Packaging Materials Company
Business Acquisition [Line Items]
Intangible asset, useful life, in years	0 years
Customer Relationships \| Colorado Container
Business Acquisition [Line Items]
Purchase price allocation to intangible assets	5,800
Intangible asset, useful life, in years	10 years
Customer Relationships \| Packaging Specialists
Business Acquisition [Line Items]
Purchase price allocation to intangible assets	15,500
Intangible asset, useful life, in years	15 years
Other Intangible Assets
Business Acquisition [Line Items]
Intangible asset, useful life, in years	2 years 10 months 24 days
Other Intangible Assets \| Field Packaging Group
Business Acquisition [Line Items]
Purchase price allocation to intangible assets	220
Intangible asset, useful life, in years	3 years
Other Intangible Assets \| Packaging Materials Company
Business Acquisition [Line Items]
Intangible asset, useful life, in years	0 years
Other Intangible Assets \| Colorado Container
Business Acquisition [Line Items]
Purchase price allocation to intangible assets	210
Intangible asset, useful life, in years	3 years
Other Intangible Assets \| Packaging Specialists
Business Acquisition [Line Items]
Purchase price allocation to intangible assets	$ 560
Intangible asset, useful life, in years	4 years

The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition.

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- Definition

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7659399&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e845-128460

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Acquisition Date

-URI http://asc.fasb.org/extlink&oid=6919109

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 25

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e848-128460

+ Details

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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will be amortized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph e

-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 Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-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

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-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 Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 53

-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.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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