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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) (USD $) | 0 Months Ended | 1 Months Ended | 6 Months Ended |  | 1 Months Ended
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Mar. 26, 2014 Decree | May 01, 2013 Defendant | Oct. 31, 2010 Defendant | Jun. 30, 2014 Participants Operable_Unit Entity | Nov. 30, 2007 Little Lake Butte Des Morts [Member] site | Nov. 30, 2007 Appvion [Member] site
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |
Aggregate of response actions, response costs and NRDs |  |  |  | $ 1,000,000,000 |  |
Number of entities |  |  |  | 7 |  |
Number of operable units |  |  |  | 5 |  |
Number of respondents directing to implement the cleanup of the Site downstream |  |  |  |  | 7 |
Number of respondents not liable for this site |  |  |  |  |  | 1
Cost of response incurred by government |  |  |  | 4,280,000 |  |
Number of defendants |  |  | 13 |  |  |
Number of other defendants to recover injunctions |  | 3 |  |  |  |
Number of additional defendants entered into agreements |  | 3 |  |  |  |
Number of proposed consent decrees | 3 |  |  |  |  |
Cash settlement amount | 56,600,000 |  |  |  |  |
Reasonable outside estimate for cost of remediation made by Government to all parties |  |  |  | 1,500,000,000 |  |
Estimated future cost of work yet to be done |  |  |  | 360,000,000 |  |
Annual estimated cost rate seek by Government |  |  |  | 70,000,000 |  |
Initial minimum amount of NRD assessment |  |  |  | 176,000,000 |  |
Initial maximum amount of NRD assessment |  |  |  | 333,000,000 |  |
Revised minimum amount of NRD assessment |  |  |  | 287,000,000 |  |
Revised maximum amount of NRD assessment |  |  |  | 423,000,000 |  |
The limitations period for the NRD claims |  |  |  | 3 years |  |
Reserve for environmental liabilities, current portion |  |  |  | 100,000 |  |
Reserve for claiming liability |  |  |  | 16,300,000 |  |
Maximum estimated percentage of discharge |  |  |  | 27.00% |  |
Number of other PRP entered into interim cost-sharing agreement |  |  |  | 6 |  |
Maximum estimated cost related to Fox River matter |  |  |  | $ 275,000,000 |  |
Period over which estimated cost accrued |  |  |  | 10 years |  |

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