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Commitments and Contingencies - Employee Relations (Details)	12 Months Ended
	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