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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. + References No definition available. + Details
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Period Type: | instant

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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. + References No definition available. + Details
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Namespace Prefix: | jfin_
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- Definition Percentage of registered capital where entity has the right to discontinue allocations to the statutory reserve. + References 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. + Details
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Namespace Prefix: | jfin_
Data Type: | xbrli:stringItemType
Balance Type: | na
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