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Earnings per Share - Additional Information (Detail) shares in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Dec. 31, 2018 shares | Dec. 31, 2016 shares
Reverse Stock Split [member] |  |  |
Earnings per share [line items] |  |  |
Stock split conversion ratio | 0.125 |  |
Series L share [member] |  |  |
Earnings per share [line items] |  |  |
Effect of dilutive potential shares |  | 27.9 | 27.9

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- Details
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- Details
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