XML 92 R60.htm IDEA: XBRL DOCUMENT v2.4.0.8

Stock-Based Compensation - Pre-Tax Compensation Expense and Related Income Tax Benefit for Stock-Based Incentives (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Tax rate - before valuation allowance	37.00%

X

- 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

X

- Details

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