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Other Investments- Summary of Transactions with Each of the Company's Other Investees (Detail) (Parenthetical) $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Digital Cinema Distribution Coalition [Member] |
Schedule of Equity Method Investments [Line Items] |
Lease Termination Payment | $ 1.0

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- Definition Lease Termination Payment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |