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Pension and Other Employee Benefits - Summary of Allocation of Fair Value of Plan Assets of Defined Contribution Plans (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Fair Value Of Plan Assets [Line Items]
Investments in listed and unlisted equity securities	96.00%	95.00%
Smart and Subsidiaries [Member]
Disclosure Of Fair Value Of Plan Assets [Line Items]
Investments in debt and fixed income securities and others	60.00%	77.00%
Investments in listed and unlisted equity securities	40.00%	23.00%
Percentage of investments in pension plan assets	100.00%	100.00%

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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Percentage of investments in debt and fixed income securities and other.

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Percentage of investments in listed and unlisted equity securities.

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Percentage of investments in pension plan assets.

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