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Acquisitions - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2012 Entity | Dec. 31, 2011 Entity
Business Acquisition [Line Items] |  |
Number of corrugated product manufacturers acquired | 4 | 4

X
- Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration