Restructuring Charges - Changes in Restructuring Reserve Liabilities (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]    
Severance costs and personnel costs $ 30,000,000  
Restructuring Reserve [Roll Forward]    
Beginning balance of reserve 0 5,098,000
Severance and benefit costs 25,768,000 196,000
Purchase obligations 1,531,000 0
Ending balance of reserve 24,181,000 0
Severance and benefit costs    
Restructuring Reserve [Roll Forward]    
Restructuring payments (3,118,000) (3,678,000)
Purchase obligation reserve adjustments 0 (461,000)
Purchase obligations    
Restructuring Reserve [Roll Forward]    
Restructuring payments 0 (561,000)
Purchase obligation reserve adjustments 0 (594,000)
Coated groundwood paper [Member]    
Restructuring Cost and Reserve [Line Items]    
Capacity of plant 350,000.000  
Specialty paper [Member]    
Restructuring Cost and Reserve [Line Items]    
Capacity of plant 55,000.000  
Minimum    
Restructuring Cost and Reserve [Line Items]    
Pre-tax cash severance and other shutdown charges 40,000,000  
Shutdown costs 10,000,000  
Maximum    
Restructuring Cost and Reserve [Line Items]    
Pre-tax cash severance and other shutdown charges 45,000,000  
Shutdown costs $ 15,000,000