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Commitments, Contingencies and Legal Proceedings - Additional Information (Detail)
 1 Months Ended 6 Months Ended
Apr. 09, 2015
USD ($)
Oct. 14, 2014
USD ($)
Sep. 25, 2014
Jan. 31, 2008
Jun. 30, 2015
USD ($)
Operable_Unit
Dec. 31, 2015
USD ($)
May. 15, 2015
Dec. 31, 2014
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            
Uncertainty premium for future response costs   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            
Environmental loss contingencies         16,200,000     $ 16,300,000
Reserve for Environmental liabilities, current portion         $ 9,957,000     $ 1,075,000
Maximum estimated percentage of discharge         27.00%      
Maximum estimated cost related to Fox River matter         $ 185,000,000      
Whiting Litigation [Member]                
Commitments Contingencies And Litigation [Line Items]                
Remaining costs and damages amount $ 33,000,000              
2015 Work Plan [Member]                
Commitments Contingencies And Litigation [Line Items]                
Annual estimated cost rate seek by Government 5,000,000              
Estimated additional annual cost of contract 5,000,000              
Estimated cost of work to satisfy our share of obligation         $ 10,000,000      
NCR [Member]                
Commitments Contingencies And Litigation [Line Items]                
Percentage of apportion liability on cost             28.00%  
NCR and GP [Member] | Whiting Litigation [Member]                
Commitments Contingencies And Litigation [Line Items]                
Costs and damages amount 67,000,000              
Maximum [Member]                
Commitments Contingencies And Litigation [Line Items]                
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         $ 170,000,000      
OU1 [Member]                
Commitments Contingencies And Litigation [Line Items]                
Estimated future cost of work yet to be done   100,000,000            
OU2-5 [Member]                
Commitments Contingencies And Litigation [Line Items]                
Estimated future cost of work yet to be done   $ 500,000,000            
Annual estimated cost rate seek by Government $ 100,000,000       70,000,000      
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] | Scenario, Forecast [Member]                
Commitments Contingencies And Litigation [Line Items]                
Estimated future cost of work yet to be done           $ 10,000,000    
Dredging Season [Member]                
Commitments Contingencies And Litigation [Line Items]                
Annual estimated cost rate seek by Government         $ 100,000,000