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Income Tax - Tax-exemption Information Related to Profits Generated from Certain Projects (Detail) | 12 Months Ended
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Dec. 31, 2017
Construction and expansion of two thousand and seven [member] |
Disclosure Of Tax Exemption [Line Items] |
Tax-exemption Period, Start | 2014
Tax-exemption Period, End | 2018
Construction and expansion of two thousand and eight [member] |
Disclosure Of Tax Exemption [Line Items] |
Tax-exemption Period, Start | 2015
Tax-exemption Period, End | 2019
Construction and expansion of two thousand and nine [member] |
Disclosure Of Tax Exemption [Line Items] |
Tax-exemption Period, Start | 2018
Tax-exemption Period, End | 2022

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- Details
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