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v3.19.1

Stock-based Compensation Plans - Additional Information (Detail) | 3 Months Ended
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Mar. 31, 2019 shares
Class B |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions | 1

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- Definition Restricted stock units holder entitle to receive number of shares of common stock upon certain service conditions. + References No definition available. + Details
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Balance Type: | na
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: |