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Nature of Business - Additional Information (Detail) |  | 1 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 Employee | Apr. 30, 2009 U S W Y | Aug. 31, 2008 U S W Y | Dec. 31, 2012 Other Unions | Dec. 31, 2012 Minimum U S W | Dec. 31, 2012 Minimum Other Unions | Dec. 31, 2012 Minimum Contracts For Unionized Corrugated Products Plant Employees | Dec. 31, 2012 Maximum U S W | Dec. 31, 2012 Maximum Other Unions | Dec. 31, 2012 Maximum Contracts For Unionized Corrugated Products Plant Employees | Dec. 31, 2012 Corrugated Plants | Apr. 30, 2009 Corrugated Plants U S W | Dec. 31, 2012 Combining Plants | Dec. 31, 2012 Sheet Plants | Dec. 31, 2012 Graphic Design Centers | Dec. 31, 2012 Kraft Linerboard Mills Property Employee | Dec. 31, 2012 Medium Mills Property Employee
Nature Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plants |  |  |  |  |  |  |  |  |  |  | 71 | 25 | 41 | 30 | 7 | 2 | 2
Total number of employees of PCA | 8,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,600 | 6,000
Percentage of hourly employees represented by unions | 75.00% |  | 91.00% | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Number of contract years extended under labor agreement |  | 5 | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of labor agreement |  |  |  |  | September 2013 | October 2014 | November 2012 | June 2015 | June 2017 | March 2018 |  |  |  |  |  |  |

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- Definition Number of persons employed by the Entity + References No definition available. + Details
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- Details
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- Definition Represents the number of plants. + References No definition available. + Details
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