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Major Customers (Details) (Customer Concentration Risk [Member], Phillip Morris, British American, and Japan Tobacco [Member])
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sales [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 46.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= swm_PhillipMorrisUsaPhillipmorrisInternationalPmiBritishAmericanTobaccoBatAndJapanTobaccoIncMember
57.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= swm_PhillipMorrisUsaPhillipmorrisInternationalPmiBritishAmericanTobaccoBatAndJapanTobaccoIncMember
55.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= swm_PhillipMorrisUsaPhillipmorrisInternationalPmiBritishAmericanTobaccoBatAndJapanTobaccoIncMember
Accounts Receivable [Member]      
Concentration Risk [Line Items]      
Concentration Risk, Percentage 29.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= swm_PhillipMorrisUsaPhillipmorrisInternationalPmiBritishAmericanTobaccoBatAndJapanTobaccoIncMember
25.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= swm_PhillipMorrisUsaPhillipmorrisInternationalPmiBritishAmericanTobaccoBatAndJapanTobaccoIncMember