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Related Party Transactions - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Chief Operating Officer |
Related Party Transaction |
Purchase of home for director | $ 11.0

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Total Costs To Date For Home And Renovations Made To The Home Purchased For An Employee. + References No definition available. + Details
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Namespace Prefix: | wynn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_ChiefOperatingOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |