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Impairment Charges, Impairment of Joint Venture Investments and Reserves - Summary of Significant Unobservable Inputs (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017
Weighted Average [Member] |
Schedule Of Investments [Line Items] |
Terminal capitalization rate, Weighted-average rate | 8.80%

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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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- Details
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Namespace Prefix: |
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Period Type: |