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Related Party Transactions (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Related Party Transaction
Rental expense		$ 5.9	$ 6.6	$ 6.9
Director James S. Andrasick's son
Related Party Transaction
Amount of related party transaction		$ 1.9
Payment percent, less than		0.50%
Reliance Steel & Aluminum Co.
Related Party Transaction
Amount of related party transaction		$ 0.7
Simpson Strong-Tie | Gerald Hagel, vice president and Susan Hagel, spouse
Related Party Transaction
Lease agreement, extended period	5 years
Rental expense		$ 0.3

X

- Definition

Represents the extended period of operating lease agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssd_
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Balance Type:	na
Period Type:	duration

X

- Definition

Payment percentage relative to the related party consolidated gross revenues

+ References

No definition available.

+ Details

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Namespace Prefix:	ssd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ssd_RelianceSteelAluminumCo.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
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