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Other Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 Other Specialty Products [Member]
Amount paid for claims settlement | $ 75 |
Increase in expected future warranty claims |  | 12
Additional capital representing company's aggregate capital commitment less capital contributions made | $ 19 |

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- Definition Additional Capital Representing Companys Aggregate Capital Commitment Less Capital Contributions Made + References No definition available. + Details
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Namespace Prefix: | mas_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents the gross amount awarded, to be received by, or to be remitted to the entity in settlement of litigation occurring during the period. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total increases or decreases in the standard and extended product warranty liability during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249 + Details
Name: | us-gaap_ProductWarrantyAccrualPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration