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Goodwill - Carrying Amount of Goodwill By Segment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014 reportable_unit	Dec. 31, 2013
Goodwill [Line Items]
Number of reportable units with goodwill	2swm_NumberofReportableSegmentsWithGoodwill
Goodwill [Roll Forward]
Goodwill beginning of period, net	$ 121,100,000us-gaap_Goodwill	$ 5,700,000us-gaap_Goodwill
Goodwill acquired during the year	5,000,000us-gaap_GoodwillAcquiredDuringPeriod	115,100,000us-gaap_GoodwillAcquiredDuringPeriod
Foreign currency translation adjustments	(600,000)us-gaap_GoodwillTranslationAdjustments	300,000us-gaap_GoodwillTranslationAdjustments
Goodwill end of period, net	125,500,000us-gaap_Goodwill	121,100,000us-gaap_Goodwill
Paper [Member]
Goodwill [Line Items]
Accumulated impairment losses	2,700,000us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = swm_PaperSegmentMember
Reconstituted Tobacco [Member]
Goodwill [Line Items]
Accumulated impairment losses	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Goodwill [Roll Forward]
Goodwill beginning of period, net	6,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember	5,700,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Goodwill acquired during the year	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember	0us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Foreign currency translation adjustments	(700,000)us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember	300,000us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Goodwill end of period, net	5,300,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember	6,000,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_ReconstitutedTobaccoMember
Filtration [Member]
Goodwill [Line Items]
Accumulated impairment losses	0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Goodwill [Roll Forward]
Goodwill beginning of period, net	115,100,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember	0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Goodwill acquired during the year	5,000,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember	115,100,000us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Foreign currency translation adjustments	100,000us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember	0us-gaap_GoodwillTranslationAdjustments / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember
Goodwill end of period, net	$ 120,200,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember	$ 115,100,000us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = swm_FiltrationSegmentMember

X

- Definition

Number of Reportable Segments With Goodwill

+ References

No definition available.

+ Details

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Namespace Prefix:	swm_
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Balance Type:	na
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X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a,h)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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- Definition

Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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