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Related Party Transactions (Details) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2013	Dec. 31, 2009
Related Party Transaction
Cost of use of airplanes			$ 500,000us-gaap_OfficersCompensation
Annual lease payment to lease the property from Mr. Hagel and his wife Susan Hagel, a former employee of Simpson Strong-Tie	6,900,000us-gaap_OperatingLeasesRentExpenseNet	6,900,000us-gaap_OperatingLeasesRentExpenseNet	6,900,000us-gaap_OperatingLeasesRentExpenseNet
Loan repayments by related parties	0us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties	700,000us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties	1,698,000us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties
Chief Executive Officer
Related Party Transaction
Cost of use of airplanes			20,000us-gaap_OfficersCompensation / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ChiefExecutiveOfficerMember
Entities related to Keymark
Related Party Transaction
Loan repayments by related parties					700,000us-gaap_ProceedsFromCollectionOfLongtermLoansToRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ssd_RelatedPartyOfEquityMethodInvesteeMember
Interest rate of loans (as a percent)					5.50%us-gaap_RelatedPartyTransactionRate / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ssd_RelatedPartyOfEquityMethodInvesteeMember
Loans made to related parties				700,000us-gaap_ProceedsFromPaymentsForLongTermLoansForRelatedParties / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ssd_RelatedPartyOfEquityMethodInvesteeMember
Simpson Strong-Tie | Gerald Hagel, vice president and Susan Hagel, spouse
Related Party Transaction
Lease agreement, extended period	5 years
Annual lease payment to lease the property from Mr. Hagel and his wife Susan Hagel, a former employee of Simpson Strong-Tie	$ 300,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = ssd_SimpsonStrongTieCompanyIncMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = ssd_VicePresidentAndImmediateFamilyMemberOfManagementMember

X

- Definition

Represents the extended period of operating lease agreement.

+ References

No definition available.

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- Definition

Expenditures for salaries of officers. Does not include allocated share-based compensation, pension and post-retirement benefit expense or other labor-related non-salary expense. For commercial and industrial companies, excludes any direct and overhead labor that is included in cost of goods sold.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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- Definition

The cash inflow associated with collection, whether partial or full, of long-term loans to a related party. Alternate caption: Proceeds from Advances to Affiliates.

+ References

No definition available.

+ Details

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- Definition

The cash inflow or outflow associated with long-term loans for related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from (Payments for) Advances to Affiliates.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

+ References

No definition available.

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