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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 t
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 |

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