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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 14, 2014 USD ($) | Sep. 25, 2014 | Jan. 31, 2008 | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Operable_Unit | May. 15, 2015 | Dec. 31, 2014 USD ($)
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Annual payments due under operating leases |  |  |  |  | $ 13,100,000 |  |
Aggregate contractual obligation |  |  |  |  | $ 130,100,000 |  |
Number of operable units | Operable_Unit |  |  |  |  | 5 |  |
Upper end estimate of total past and future response costs | $ 1,100,000,000 |  |  |  |  |  |
Uncertainty premium for future response costs | 100,000,000 |  |  |  |  |  |
Estimated cost not included in final accounts | 100,000,000 |  |  |  |  |  |
Annual estimated cost rate seek by Government |  |  |  |  | $ 100,000,000 |  |
Cost of response incurred by government |  |  |  |  | 4,280,000 |  |
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 |  |
Reserve for environmental liability, expected compensation payments | 45,900,000 |  |  |  |  |  |
Environmental loss contingencies | 105,000,000 |  |  |  |  |  |
Other prepaid loss contingencies for earlier settlements | 59,000,000 |  |  |  |  |  |
Increase in remediation activities reserve |  |  |  |  | 10,000,000 |  |
Reserve for Environmental liabilities, current portion |  |  |  |  | $ 12,544,000 |  | $ 1,075,000
Maximum estimated percentage of discharge |  |  |  |  | 27.00% |  |
Whiting Litigation [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Remaining costs and damages amount |  |  |  |  | $ 33,000,000 |  |
2016 Work Plan [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Increase in remediation activities reserve |  |  |  | $ 10,000,000 |  |  |
NCR and GP [Member] | Whiting Litigation [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Costs and damages amount |  |  |  |  | 67,000,000 |  |
NCR and GP [Member] | 2016 Work Plan [Member] | Whiting Litigation [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Annual estimated cost rate seek by Government |  |  |  |  | $ 100,000,000 |  |
NCR [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Percentage of apportion liability on cost |  |  |  |  |  | 28.00% |
Minimum [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Period over which estimated cost to be incurred |  |  |  |  | 2 years |  |
Minimum [Member] | Appvion [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Litigation claim amount |  |  |  |  | $ 170,000,000 |  |
Maximum [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Estimated cost related to Fox River matter |  |  |  |  | $ 175,000,000 |  |
Period over which estimated cost to be incurred |  |  |  |  | 3 years |  |
OU2-5 [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Estimated future cost of remediation |  |  |  |  | $ 9,700,000 |  |
Estimated future cost of work yet to be done | 500,000,000 |  |  |  |  |  |
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% |  |  |  |
OU2-5 [Member] | 2015 Work Plan [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Annual remediation cost rate seek by Government |  |  |  |  | $ 100,000,000 |  |
OU1 [Member] |  |  |  |  |  |  |
Commitments Contingencies And Litigation [Line Items] |  |  |  |  |  |  |
Estimated future cost of work yet to be done | $ 100,000,000 |  |  |  |  |  |

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