Condensed Financial Information of Registrant (Parent Company Only) - Additional Information (Detail)	Dec. 31, 2020
Parent Company [Member]
Condensed Statement of Income Captions [Line Items]
Minimum threshold percentage of restricted net assets	25.00%

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

No definition available.

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Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration