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Segment Information - Additional Information (Detail) - Brand	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Number of brands	4
Percentage of total consolidated net sales accounted by three largest customers	37.00%	39.00%	37.00%

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- Definition

Number of Brands

+ References

No definition available.

+ Details

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Namespace Prefix:	mat_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- 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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- References

No definition available.

+ Details

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