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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

The number of businesses acquired by the entity during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration