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Supplementary Information - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Interest rate of Company's reserves | 10.00%
Rate of discounted future net cash flows | 10.00%
Percentage of discounted future prices | 10.00%

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- Definition Discounted future net cash flows discounting rate used to derive standard measure of discounted future net cash flows. + References No definition available. + Details
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- Definition Percentage of discounted future prices. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of minority interest share in aggregate company's reserves. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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