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Legal Proceedings - Additional Information (Detail) (USD $) | 12 Months Ended | 36 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended | 4 Months Ended |  |
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Dec. 31, 2014 Plaintiff | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 22, 2011 Plaintiff | Dec. 31, 2009 Plaintiff | Dec. 31, 2010 | Jun. 08, 2012 Plaintiff | Nov. 30, 2011 Plaintiff | Jan. 31, 2015 | Jun. 14, 2013 case | Feb. 28, 2014 Plaintiff | Jul. 31, 2013 Plaintiff | Jan. 04, 2011 Plaintiff | Apr. 29, 2011
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs cases dismissed | 2 fss_LossContingencyNumberOfPlaintiffsDismissed |  |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, minimum amount | $ 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum |  |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, maximum amount | 5,000,000 us-gaap_LossContingencyRangeOfPossibleLossMaximum |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement | 300,000 us-gaap_ReimbursementRevenue | 500,000 us-gaap_ReimbursementRevenue | 700,000 us-gaap_ReimbursementRevenue |  |  |  |  |  |  |  |  |  |  |
Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  | 74 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  |  |  |  |  |  |  | 308 us-gaap_LossContingencyPendingClaimsNumber / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember |
Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages maximum amount | 100,000 us-gaap_LossContingencyDamagesSoughtValue / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, minimum amount | 80,000 us-gaap_LossContingencyRangeOfPossibleLossMinimum / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  |  |  |  |  |  |  | 1,125 us-gaap_LossContingencyPendingClaimsNumber / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember |
Settlement Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  | 1,069 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |
Claims settled amount | 3,800,000 fss_LossContingencyClaimsSettledAmount / fss_CourtSettlementAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of claimants agreed for settlement |  |  |  | 95.02%fss_PercentageOfClaimantsAgreedForSettlement / fss_CourtSettlementAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  | 93.00%fss_PercentageOfClaimantsAgreedForSettlement / fss_CourtSettlementAxis = fss_SettlementAgreementMember
Percentage of claimants agreed for settlement as per settlement agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00%fss_PercentageOfClaimantsAgreedForSettlementAsPerSettlementAgreement / fss_CourtSettlementAxis = fss_SettlementAgreementMember
Settlement Agreement payment made |  |  |  | 3,600,000 us-gaap_LitigationSettlementAmount / fss_CourtSettlementAxis = fss_SettlementAgreementMember |  |  |  |  |  |  |  |  |  |
Supreme Court of Kings County, New York [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases dismissed |  |  |  |  | 4 fss_LossContingencyNumberofCasesDismissed / fss_CourtSettlementAxis = fss_SupremeCourtofKingsCountyNewYorkMember |  |  |  |  |  |  |  |  |
1999-2004 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 33 fss_NumberOfLawsuitsFiled / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_NineteenNinetyNineToTwoThousandFourMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 2,443 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_NineteenNinetyNineToTwoThousandFourMember |  |  |  |  |  |  |  |  |  |  |  |  |
2009 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 6 fss_NumberOfLawsuitsFiled / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandNineMember |  |  |  |  |  |  |  |  |  |  |  |  |
2008 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Settled and Dismissed, Number | 27 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandEightMember |  |  |  |  |  |  |  |  |  |  |  |  |
2007-2009 | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trials occurred |  |  |  |  |  | 3 fss_Numberoftrialsoccurred / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandSevenToTwoThousandNineMember |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 71 fss_NumberOfLawsuitsFiled / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandSevenToTwoThousandNineMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 71 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandSevenToTwoThousandNineMember |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number |  |  |  |  | 3 us-gaap_LossContingencyClaimsDismissedNumber / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandSevenToTwoThousandNineMember |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Settled and Dismissed, Number |  |  |  |  | 4 us-gaap_LossContingencyClaimsSettledAndDismissedNumber / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandSevenToTwoThousandNineMember |  |  |  |  |  |  |  |  |
Outside Chicago Firefighter Plaintiffs | 1999-2004 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 1,800 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_PlaintiffsAxis = fss_OutsideChicagoFirefighterPlaintiffsMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_NineteenNinetyNineToTwoThousandFourMember |  |  |  |  |  |  |  |  |  |  |  |  |
Pennsylvania Firefighter Plaintiffs | 2009 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 299 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_PlaintiffsAxis = fss_PennsylvaniaFirefighterPlaintiffsMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandNineMember |  |  |  |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 1,800 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember |  |  |  |  |  | 3 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember | 8 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember |  |  |  |  |  |
Chicago Firefighter Plaintiffs | 2009 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 40 fss_NumberOfLawsuitsFiled / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandNineMember |  |  |  |  |  |  |  |  |  |  |  |  |
Claims settled amount | $ 400,000 fss_LossContingencyClaimsSettledAmount / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandNineMember |  |  |  |  |  |  |  |  |  |  |  |  |
Philadelphia Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 7 fss_NumberOfLawsuitsFiled / fss_PlaintiffsAxis = fss_PhiladelphiaFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 3 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_PhiladelphiaFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases of plaintiff's claims |  |  |  |  |  |  |  |  | 2 |  |  |  |  |
Philadelphia Firefighter Plaintiffs | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 20 fss_NumberOfLawsuitsFiled / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_PlaintiffsAxis = fss_PhiladelphiaFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 20 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_PlaintiffsAxis = fss_PhiladelphiaFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases dismissed |  |  |  |  |  |  |  |  |  | 5 fss_LossContingencyNumberofCasesDismissed / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_PlaintiffsAxis = fss_PhiladelphiaFirefighterPlaintiffsMember |  |  |  |
Philadelphia Firefighter Plaintiffs | 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  | 9 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_PhiladelphiaFirefighterPlaintiffsMember / fss_TimePeriodOfLegalCasesFiledAxis = fss_TwoThousandTenMember |  |  |  |  |  |  |  |
Philadelphia Firefighter Plaintiffs | 2010 | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Trial or Alternative Dispute Resolution | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Pittsburgh Firefighter Plaintiffs | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  | 61 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_PlaintiffsAxis = fss_PittsburghFirefighterPlaintiffsMember | 247 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_PlaintiffsAxis = fss_PittsburghFirefighterPlaintiffsMember |  |
Number of cases dismissed |  |  |  |  |  |  |  |  |  |  |  | 38 fss_LossContingencyNumberofCasesDismissed / fss_CourtSettlementAxis = fss_CourtOfCommonPleasPhiladelphiaCountyMember / fss_PlaintiffsAxis = fss_PittsburghFirefighterPlaintiffsMember |  |
Erie County Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 32 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_ErieCountyFirefighterPlaintiffsMember |  |  |  |  |  |  |  |  |  |  |  |  |
Buffalo Fire Department Firefighters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters | 20 fss_NumberOfLawsuitsFiled / fss_PlaintiffsAxis = fss_BuffaloFireDepartmentFirefightersMember |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 193 us-gaap_LossContingencyNumberOfPlaintiffs / fss_PlaintiffsAxis = fss_BuffaloFireDepartmentFirefightersMember |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Chicago Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 40 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Chicago Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | 9 us-gaap_LossContingencyNumberOfPlaintiffs / fss_CourtSettlementAxis = fss_CircuitCourtOfCookCountyMember / fss_PlaintiffsAxis = fss_ChicagoFirefighterPlaintiffsMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  |  |  |  |  |  |

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