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v3.20.4

Stock-based Compensation and Outstanding Awards - Summary of Status of Nonvested Shares of PSAs (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020 shares
Performance Share (PSAs) Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Shares withheld and retired to satisfy minimum tax withholding | 15,000

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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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- Definition Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |