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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) Operable_Unit | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments Contingencies And Litigation [Line Items] |  |  |
Number of operable units | Operable_Unit | 5 |  |
Reserve for Environmental liabilities, current portion | $ 20,000 | $ 25,000 |
Other Long-Term Liabilities [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Reserve for Environmental liabilities, remaining portion | 23,200 |  |
NCR/Appvion Consent Decree [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Contribution payment towards remedial action and natural resource damages | 75,000 |  |
Anticipated cost to complete work for remaining site remedy | 200,000 |  |
Expected payments for governments unreimbursed past costs which are under dispute | $ 34,000 |  |
Minimum [Member] | December 2009 - Long Term Monitoring Plan [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Period over which cash expenditure to be incurred for monitoring activities | 30 years |  |
Maximum [Member] | NCR/Appvion Consent Decree [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Estimated cost related to Fox River matter | $ 30,000 |  |
Georgia Pacific [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Settlement payable amount | $ 9,500 |  |
Payment due date | 2017-08 |  |
GLT, GP and NCR [Member] | Minimum [Member] | NCR/Appvion Consent Decree [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Contribution payment towards remedial action and natural resource damages | $ 1,000,000 |  |
OU2-5 [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
Estimated future cost of cleanup work |  | $ 13,400 | $ 13,400
Expected cleanup work continuation year | through 2018 |  |
NCR costs and damages percentage | 100.00% |  |
OU2-5 [Member] | Whiting Litigation [Member] |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |
NCR costs and damages percentage | 100.00% |  |

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