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Operations and Summary of Significant Accounting Policies - PP&E and Other Misc Disclosures (Details) (USD $) | 12 Months Ended |
--- | --- | ---
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%ssd_PercentageOfInterestHeldForEquityMethodInvestmentsHighEndOfRange |
Allowance for Doubtful Accounts |  |
Percentage reserved for accounts receivable due from customers in deteriorating financial condition | 100.00%ssd_AccountsReceivableCustomersInBankruptcyOrDeterioratingFinancialConditionPercentageReservedAsUncollectible |
Fair Value of Financial Instruments |  |
United States Treasury securities and money market funds included in cash equivalents | $ 99,024,000 ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure | $ 117,571,000 ssd_USTreasurySecuritiesAndMoneyMarketFundsFairValueDisclosure
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%ssd_ServiceSalesPercentageOfNetSales / us-gaap_RangeAxis = us-gaap_MaximumMember |
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 | $ 200,000 us-gaap_BusinessCombinationContingentConsiderationAsset / us-gaap_BusinessAcquisitionAxis = ssd_BierbachGmbHAndCo.KGMember | $ 800,000 us-gaap_BusinessCombinationContingentConsiderationAsset / us-gaap_BusinessAcquisitionAxis = ssd_BierbachGmbHAndCo.KGMember

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- 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
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- 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 25 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6411-128476 + Details
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