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Earnings Per Share - Schedule of Computations of Weighted Average Shares Outstanding (Parenthetical) (Detail) shares in Millions | 12 Months Ended
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Dec. 31, 2018 shares
Share Based Awards [Member] |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |
Potentially dilutive restricted share awards excluded from computation of diluted EPS | 0.6

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- Definition Dilutive securities excluded from computation of earnings per share, amount. + 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_
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Balance Type: | na
Period Type: | duration

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