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Commitments and Contingencies - Schedule of Future Minimum Payments for Licensing and Similar Agreements (Detail) $ in Thousands | Dec. 31, 2017 USD ($)
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Commitments and Contingencies Disclosure [Abstract] |
2018 | $ 80,624
2019 | 122,651
2020 | 84,051
2021 | 29,746
2022 | 4,451
Thereafter | 0
Total future minimum licensing and similar agreements obligations | $ 321,523

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- Definition For licensing and similar agreements containing provisions for future minimum payments, the total required payments due. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For licensing and similar agreements containing provisions for future minimum payments, required payments due within one year of the balance sheet date. + References No definition available. + Details
Name: | mat_LicensingAndSimilarAgreementsFutureMinimumPaymentsDueCurrent
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For licensing and similar agreements containing provisions for future minimum payments, required payments due within the fifth year of the balance sheet date. + References No definition available. + Details
Name: | mat_LicensingAndSimilarAgreementsFutureMinimumPaymentsDueInFiveYears
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For licensing and similar agreements containing provisions for future minimum payments, required payments due within the fourth year of the balance sheet date. + References No definition available. + Details
Name: | mat_LicensingAndSimilarAgreementsFutureMinimumPaymentsDueInFourYears
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For licensing and similar agreements containing provisions for future minimum payments, required payments due within the third year of the balance sheet date. + References No definition available. + Details
Name: | mat_LicensingAndSimilarAgreementsFutureMinimumPaymentsDueInThreeYears
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition For licensing and similar agreements containing provisions for future minimum payments, required payments due within the second year of the balance sheet date. + References No definition available. + Details
Name: | mat_LicensingAndSimilarAgreementsFutureMinimumPaymentsDueInTwoYears
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For licensing and similar agreements containing provisions for future minimum payments, required payments due after the fifth year of the balance sheet date. + References No definition available. + Details
Name: | mat_LicensingAndSimilarAgreementsFutureMinimumPaymentsDueThereafter
Namespace Prefix: | mat_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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