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Discontinued Operations - Additional Information (Detail) $ in Millions	Dec. 31, 2018 USD ($)
Specialty Papers | Discontinued Operations, Disposed of by Sale
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Selling price of business	$ 360.0

X

- Definition

Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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