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Employee Benefits - Summary of Allocation of Fair Value of Plan Assets of Defined Contribution Plans (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Investments in listed and unlisted equity securities | 95.00% | 95.00%
Smart and Subsidiaries [Member] |  |
Disclosure Of Fair Value Of Plan Assets [Line Items] |  |
Investments in debt and fixed income securities and others | 77.00% | 70.00%
Investments in listed and unlisted equity securities | 23.00% | 30.00%
Percentage of investments in pension plan assets | 100.00% | 100.00%

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- Definition Percentage of investments in debt and fixed income securities and other. + References No definition available. + Details
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- Details
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