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Other Noncurrent Assets - Additional Information (Detail) (MEGA Brands, USD $) In Millions, unless otherwise specified	1 Months Ended
	Apr. 30, 2014
MEGA Brands
Other Noncurrent Assets Disclosure [Line Items]
Amortizable identifiable intangible assets acquired	$ 95.0us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = mat_MegaBrandsMember

X

- Details

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

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_FinitelivedIntangibleAssetsAcquired1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration