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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail)
 1 Months Ended 9 Months Ended 12 Months Ended
Oct. 14, 2014
USD ($)
Sep. 25, 2014
Jan. 31, 2008
Sep. 30, 2016
USD ($)
Operable_Unit
Dec. 31, 2015
USD ($)
Commitments Contingencies And Litigation [Line Items]          
Number of operable units | Operable_Unit       5  
Upper end estimate of total past and future response costs $ 1,100,000,000        
Estimated future cost of work yet to be done 575,000,000        
Cost of response incurred by government       $ 4,280,000  
Reserve for Environmental liabilities, current portion       8,408,000 $ 12,544,000
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        
Maximum estimated percentage of discharge       27.00%  
Whiting Litigation [Member]          
Commitments Contingencies And Litigation [Line Items]          
Remaining costs and damages amount         33,000,000
Whiting Litigation [Member] | NCR and GP [Member]          
Commitments Contingencies And Litigation [Line Items]          
Costs and damages amount         67,000,000
Whiting Litigation [Member] | NCR and GP [Member] | 2016 Work Plan [Member]          
Commitments Contingencies And Litigation [Line Items]          
Annual estimated cost rate seek by Government       $ 100,000,000  
Maximum [Member]          
Commitments Contingencies And Litigation [Line Items]          
Estimated cost related to Fox River matter       $ 190,000,000  
Period over which estimated cost to be incurred       3 years  
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       $ 200,000,000  
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 100,000,000        
Annual estimated cost rate seek by Government       100,000,000  
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
OU2-5 [Member] | Whiting Litigation [Member]          
Commitments Contingencies And Litigation [Line Items]          
NCR costs and damages percentage     100.00%    
OU2-5 [Member] | Maximum [Member]          
Commitments Contingencies And Litigation [Line Items]          
Estimated cost of unresolved technical issues       4,000,000  
OU2-5 [Member] | Maximum [Member] | Whiting Litigation [Member] | 2016 Work Plan [Member]          
Commitments Contingencies And Litigation [Line Items]          
Reserve for Environmental liabilities, current portion       5,000,000  
OU1 [Member]          
Commitments Contingencies And Litigation [Line Items]          
Uncertainty premium for future response costs $ 100,000,000        
Natural Resource Damage Claims [Member]          
Commitments Contingencies And Litigation [Line Items]          
Litigation claim amount       35,100,000  
Natural Resource Damage Claims [Member] | Minimum [Member] | United States [Member]          
Commitments Contingencies And Litigation [Line Items]          
Litigation claim amount       4,700,000  
Natural Resource Damage Claims [Member] | Minimum [Member] | Wisconsin [Member]          
Commitments Contingencies And Litigation [Line Items]          
Litigation claim amount       $ 4,700,000