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Acquisition - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Apr. 30, 2013
Dresden Papier GmbH [Member]
Sep. 30, 2014
Dresden Papier GmbH [Member]
Sep. 30, 2014
Dresden Papier GmbH [Member]
Dec. 31, 2013
Dresden Papier GmbH [Member]
Employees
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Business Acquisition [Line Items]                        
Payment made for acquisition, net of cash acquired $ 211,000,000       $ 210,911,000       $ 211,000,000      
Revenue   465,952,000 457,844,000 1,373,066,000 1,290,525,000         38,800,000 118,400,000 158,600,000
Number of employees                       146
Manufacturing capacity                       72,800
Date of acquisition                     Apr. 30, 2013  
Useful life of property plant and equipment             5 years 30 years        
Remaining useful life of intangible assets       17 years                
Goodwill   87,772,000   87,772,000   95,948,000       74,900,000 74,900,000  
Intangible assets   87,596,000   87,596,000           87,600,000 87,600,000  
Identifiable intangible assets       9,800,000                
Operating income   $ 44,217,000 $ 31,841,000 $ 77,120,000 $ 62,133,000         $ 6,500,000 $ 23,600,000