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Commitments and Contingencies (Details 2)	12 Months Ended	1 Months Ended
	Dec. 31, 2014 lawsuit	Feb. 29, 2012 lawsuit	Jul. 20, 2011 lawsuit
Collective bargaining arrangements
Percentage of employees represented by labor unions	14.00%ssd_PercentageOfEmployeesAsRepresentedByLaborUnions
Litigation
Number of lawsuits filed against the entity	4us-gaap_LossContingencyPendingClaimsNumber
Nishimura case
Litigation
Number of lawsuits filed against the entity			5us-gaap_LossContingencyPendingClaimsNumber / us-gaap_LitigationCaseAxis = ssd_NishimuraCaseMember
Number of lawsuits dismissed		3us-gaap_LossContingencyClaimsSettledAndDismissedNumber / us-gaap_LitigationCaseAxis = ssd_NishimuraCaseMember
Simpson Strong-Tie | San Bernardino County
Collective bargaining arrangements
Collective bargaining agreements, number	2ssd_NumberOfCollectiveBargainingAgreements / dei_EntityByLocationAxis = ssd_SanBernardinoCountyMember / dei_LegalEntityAxis = ssd_SimpsonStrongTieCompanyIncMember
Simpson Strong-Tie | San Bernardino County | Tool and die craftsmen and maintenance workers
Collective bargaining arrangements
Collective bargaining agreements, number	1ssd_NumberOfCollectiveBargainingAgreements / us-gaap_CollectiveBargainingArrangementAxis = ssd_ToolAndDieCraftsmenAndMaintenanceWorkersMember / dei_EntityByLocationAxis = ssd_SanBernardinoCountyMember / dei_LegalEntityAxis = ssd_SimpsonStrongTieCompanyIncMember
Simpson Strong-Tie | Stockton
Collective bargaining arrangements
Collective bargaining agreements, number	2ssd_NumberOfCollectiveBargainingAgreements / dei_EntityByLocationAxis = ssd_StocktonMember / dei_LegalEntityAxis = ssd_SimpsonStrongTieCompanyIncMember

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- Definition

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- Definition

Represents the percentage of employees who are represented by labor unions.

+ References

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- Definition

The number of claims settled and dismissed during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

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- Definition

Number of pending claims pertaining to a loss contingency.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

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