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RESTRICTED NET ASSETS - Additional Information (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Net Assets [Abstract]
Minimum percentage of after tax profit to be allocated to statutory reserve	10.00%
Percentage of registered capital where entity has the right to discontinue allocations to the statutory reserve	50.00%
Amounts restricted that include paid in capital and statutory reserve funds, as determined pursuant to PRC GAAP	¥ 738,494	¥ 217,199	¥ 217,199

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- Definition

Amounts restricted which includes paid in capital and statutory reserve funds.

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No definition available.

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- Definition

For entities incorporated in PRC, the minimum percentage of the after-tax profits allocated to statutory reserve until the reserve balance is a specified percentage of the registered capital.

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No definition available.

+ Details

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- Definition

Percentage of registered capital where entity has the right to discontinue allocations to the statutory reserve.

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No definition available.

+ Details

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Namespace Prefix:	jfin_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

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