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v3.8.0.1

Property, Plant and Equipment - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of detailed information about property, plant and equipment [abstract] |  |  |
Average annual depreciation rate | 3.14% | 3.51% | 3.39%

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- References No definition available. + Details
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- Definition Average annual depreciation rate property, plant and equipment. + References No definition available. + Details
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