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Pre-Tax Compensation Expense and Related Income Tax Benefit for Stock-Based Incentives (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2012
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |
Tax rate - before valuation allowance | 36.00%

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- Definition Effective Income Tax Benefit Rate + References No definition available. + Details
Name: | mas_EffectiveIncomeTaxBenefitRate
Namespace Prefix: | mas_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_DeferredCompensationArrangementWithIndividualShareBasedPaymentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration