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Commitments and Contingencies - Employee Relations (Details) | 12 Months Ended
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Dec. 31, 2017
Collective bargaining arrangements |
Percentage of employees represented by labor unions | 13.00%

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | ssd_CollectiveBargainingArrangementsLineItems
Namespace Prefix: | ssd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of employees who are represented by labor unions. + References No definition available. + Details
Name: | ssd_PercentageOfEmployeesAsRepresentedByLaborUnions
Namespace Prefix: | ssd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration