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Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Disclosure [Line Items]
Percentage of total consolidated net sales accounted by three largest customers	36.00%	37.00%	38.00%

X

- Definition

Percentage of total consolidated net sales accounted for by three largest customers.

+ References

No definition available.

+ Details

Name:	mat_PercentageOfTotalConsolidatedNetSalesAccountedForByThreeLargestCustomers
Namespace Prefix:	mat_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	mat_SegmentReportingDisclosureLineItems
Namespace Prefix:	mat_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration