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Commitments and Contingencies Litigation Details (Details) $ in Millions	Nov. 20, 2017 USD ($)
Nishimura v. Gentry Homes, Ltd
Loss Contingencies [Line Items]
Amount awarded from other party	$ 90

X

- Definition

Amount awarded from other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

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

X

- 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

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

X

- Details

Name:	srt_LitigationCaseAxis=ssd_Nishimurav.GentryHomesLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: