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Stock-Based Compensation Plans (Details) (USD $) | 12 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 plan | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 06, 2013 | Feb. 02, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |  |
Number of stock-based incentive plans | 1 ssd_NumberOfStockIncentivePlans |  |  |  |
Number of stock option plans superseded | 2 ssd_NumberOfStockOptionPlansSuperseded |  |  |  |
Black-Scholes option pricing model assumptions for options granted |  |  |  |  |
Number of Options Granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Total intrinsic value of stock options exercised (in dollars) | $ 800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 2,600,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue | $ 1,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |
Granted (in shares) | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |  |  |
Unrecognized compensation cost and vesting period |  |  |  |  |
Unrecognized compensation costs related to unvested stock-based compensation arrangements | 14,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense | 1 year 9 months |  |  |  |
Other disclosures |  |  |  |  |
Stock-based compensation expense recognized in operating expenses | 12,299,000 us-gaap_AllocatedShareBasedCompensationExpense | 12,053,000 us-gaap_AllocatedShareBasedCompensationExpense | 10,205,000 us-gaap_AllocatedShareBasedCompensationExpense |  |
1994 Plan |  |  |  |  |
Other disclosures |  |  |  |  |
Requisite service period for options to vest | 4 years |  |  |  |
Stock Bonus Plan |  |  |  |  |
Other disclosures |  |  |  |  |
Shares issued and committed to issue | 16,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAndCommittedToBeIssuedInPeriod / us-gaap_PlanNameAxis = ssd_StockBonusPlanMember | 11,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAndCommittedToBeIssuedInPeriod / us-gaap_PlanNameAxis = ssd_StockBonusPlanMember | 9,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedAndCommittedToBeIssuedInPeriod / us-gaap_PlanNameAxis = ssd_StockBonusPlanMember |  |
Stock-based compensation expense recognized in operating expenses | 600,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ssd_StockBonusPlanMember | 700,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ssd_StockBonusPlanMember | 500,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_PlanNameAxis = ssd_StockBonusPlanMember |  |
Requisite service period for options to vest | 10 years |  |  |  |
Restricted Stock Units |  |  |  |  |
Restricted stock unit activity |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 448,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Awarded (in shares) | 343,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Vested (in shares) | (284,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Forfeited (in shares) | (3,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Outstanding at the end of the period (in shares) | 504,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 448,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Outstanding and expected to vest at the end of the period (in shares) | 492,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 32.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Awarded (in dollars per share) | $ 30.98 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Vested (in dollars per share) | $ 32.06 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Forfeited (in dollars per share) | $ 31.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 31.67 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 32.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Outstanding and expected to vest at the end of the period (in dollars per share) | $ 31.68 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | 17,423,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 16,447,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Outstanding and expected to vest at end of the period (in dollars) | 15,582,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Closing price per share (in dollars per share) | $ 34.60 us-gaap_SharePrice / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Total intrinsic value of awards vested (in dollars) | 9,100,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 5,700,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 3,100,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 32.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Forfeited (in dollars per share) | $ 31.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 31.67 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | $ 32.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | 17,423,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 16,447,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |
Outstanding and expected to vest at end of the period (in dollars) | 15,582,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  |  |  |
Non-Qualified Stock Options |  |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 29.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Forfeited (in dollars per share) | $ 32.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 29.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 29.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | 4,381,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 7,404,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Outstanding and expected to vest at end of the period (in dollars) | 4,341,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Non-Qualified Stock Options activity |  |  |  |  |
Outstanding at the beginning of the period (in shares) | 1,021,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Exercised (in shares) | (161,000)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Forfeited (in shares) | (5,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Outstanding at the end of the period (in shares) | 855,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 1,021,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Outstanding and expected to vest at the end of the period (in shares) | 847,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Exercisable at the end of the period (in shares) | 756,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 29.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Exercised (in dollars per share) | $ 28.54 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Forfeited (in dollars per share) | $ 32.92 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Outstanding at the end of the period (in dollars per share) | $ 29.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | $ 29.35 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Outstanding and expected to vest at end of the period (in dollars per share) | $ 29.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Exercisable at end of the period (in dollars per share) | $ 29.45 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Weighted-Average Remaining Contractual Life |  |  |  |  |
Outstanding at the end of the period | 3 years 1 month 6 days | 4 years |  |  |
Outstanding and expected to vest at end of the period | 3 years 1 month 6 days |  |  |  |
Exercisable at end of the period | 3 years |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding at the end of the period (in dollars) | 4,381,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 7,404,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |
Outstanding and expected to vest at end of the period (in dollars) | 4,341,000 ssd_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Exercisable at end of the period (in dollars) | $ 3,889,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Closing price of share (in dollars per share) | $ 34.60 ssd_CommonStockClosingPricePerShare / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Unvested Stock Options |  |  |  |  |
Number of Shares, Unvested Stock Options |  |  |  |  |
Unvested at the beginning of the period (in shares) | 448,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Vested (in shares) | (348,000)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Forfeited (in shares) | (1,000)us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Unvested at the end of the period (in shares) | 99,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Weighted-Average Grant-Date Fair Value, Unvested Stock Options |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) | $ 10.31 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Vested (in dollars per share) | $ 10.31 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Forfeited (in dollars per share) | $ 10.33 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Unvested at the end of the period (in dollars per share) | $ 10.33 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ssd_UnvestedOptionsMember |  |  |  |
Independent directors | Restricted Stock Units | Restrictions lapse (awards vest) on date of award |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Vesting rights percentage when restrictions lapse |  |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ssd_AwardsThatVestOnDateOfAwardMember |
Independent directors | Restricted Stock Units | Restrictions lapse (awards vest) on first, second and third anniversaries of the date of the award |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Vesting rights percentage when restrictions lapse |  |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember / us-gaap_VestingAxis = ssd_AwardsThatVestOnFirstSecondThirdAnniversariesMember |
Restrictions on awards to certain officers |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Number of executive officers | 4 ssd_NumberOfExecutiveOfficers / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember |  |  |  |
Restrictions on awards to certain officers | Restricted Stock Units | Restrictions lapse (awards vest) on the third anniversary of the date of the award |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Vesting rights percentage when restrictions lapse |  |  |  | 75.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ssd_AwardsThatVestOnThirdAnniversaryMember |
Restrictions on awards to certain officers | Restricted Stock Units | Restrictions lapse (awards vest) on the fourth anniversary of the date of the award |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |
Vesting rights percentage when restrictions lapse |  |  |  | 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_TitleOfIndividualAxis = us-gaap_OfficerMember / us-gaap_VestingAxis = ssd_AwardsThatVestOnFourthAnniversaryMember |
Subsequent event | Restricted Stock Units |  |  |  |  |
Restricted stock unit activity |  |  |  |  |
Awarded (in shares) |  |  |  |  | 339,047 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Subsequent event | Independent directors | Restricted Stock Units |  |  |  |  |
Restricted stock unit activity |  |  |  |  |
Awarded (in shares) |  |  |  |  | 8,550 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Weighted-Average Exercise Price |  |  |  |  |
Awarded (in dollars per share) |  |  |  |  | 32.64 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember

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