Segment Information - Additional Information (Detail)	12 Months Ended
Dec. 31, 2019 Segments
Disclosure of operating segments [line items]
Number of operating segments	3
Overseas [member] \| Minimum [member]
Disclosure of operating segments [line items]
Percentage of limit of external group revenue	10.00%

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.

No definition available.

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Balance Type:	na
Period Type:	duration