The percentage reserved for accounts receivable from customers in deteriorating financial condition or bankruptcy.

No definition available.

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

- Definition

The high end of the range of the required percentage voting interest to be held by the reporting entity to use the equity method of accounting to report investments, corporate joint ventures, partnerships and affiliated companies in its consolidated financial statements. If the reporting entity can exercise control over the operations and policies, accounting rules require consolidation of the investee's financial statements.

+ References

No definition available.

+ Details

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

- Definition

Percentage of net sales attributed to services sales.

+ References

No definition available.

+ Details

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

- Definition

Represents the amount of investment made by the entity in United States Treasury securities and money market funds.

+ References

No definition available.

+ Details

Name:	ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure
Namespace Prefix:	ssd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_AccountsReceivableNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of asset recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DepreciationAndAmortizationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ssd_BierbachGmbHAndCo.KGMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting	50.00%
Allowance for Doubtful Accounts
Percentage reserved for accounts receivable due from customers in deteriorating financial condition	100.00%
Fair Value of Financial Instruments
United States Treasury securities and money market funds included in cash equivalents	$ 2,832	$ 76,047
Minimum \| Software
Depreciation and Amortization
Estimated useful life	3 years
Minimum \| Machinery and equipment
Depreciation and Amortization
Estimated useful life	3 years
Minimum \| Buildings and site improvements
Depreciation and Amortization
Estimated useful life	15 years
Maximum
Revenue Recognition
Service sales as a percentage of net sales	1.00%
Maximum \| Software
Depreciation and Amortization
Estimated useful life	5 years
Maximum \| Machinery and equipment
Depreciation and Amortization
Estimated useful life	10 years
Maximum \| Buildings and site improvements
Depreciation and Amortization
Estimated useful life	45 years
Bierbach GmbH And Co. KG
Revenue Recognition
Contingent consideration from business acquisition			$ 200	$ 800