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RELATED PARTY TRANSACTIONS - Summary of transactions with and amounts due from and due to related parties (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2020 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |
Services provided to related parties | ¥ 6,209 |  | ¥ 1,761 | ¥ 0 |
Loans from related parties | 3,113 | $ 477 | 230 | 70,765 |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties | 542 |  | 130,722 |  | $ 83
Amounts due to related parties |  |  |  |  |
Amounts due to related parties | 8,785 |  | 872 |  | $ 1,346
Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties | 70,481 |  | 106,348 | 133,165 |
Services Provided To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided to related parties | 6,209 |  | 1,761 |  |
Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties | 542 |  | 123,947 | 11,550 |
Loans From Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans from related parties | 3,113 |  | 230 | 70,765 |
Shanghai Jiayin Zhuoyue Wealth Management Co., Ltd |  |  |  |  |
Amounts due to related parties |  |  |  |  |
Amounts due to related parties | 3,442 |  | 722 |  |
Shanghai Jiayin Zhuoyue Wealth Management Co., Ltd | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties | 55,207 |  | 81,206 | 77,984 |
Shanghai Jiayin Finance Services Co., Ltd |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 1,564 |  |
Amounts due to related parties |  |  |  |  |
Amounts due to related parties | 2,150 |  |  |  |
Shanghai Jiayin Finance Services Co., Ltd | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties | 5,845 |  | 8,280 | 13,806 |
Shanghai Jiayin Finance Services Co., Ltd | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties |  |  | 909 |  |
Shanghai Shilupan Technology Co., Ltd. | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties |  |  | 7,863 | 17,202 |
Jiayin (Shanghai) Finance Information Service Co., Ltd | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties | 9,004 |  | 6,548 | 2,459 |
Li Mahui Technology Co. Ltd | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties | 425 |  |  |  |
Kailiantong Payment Service Co., Ltd. |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 1,050 |  |
Kailiantong Payment Service Co., Ltd. | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties |  |  | 2,255 | 8,065 |
Kailiantong Payment Service Co., Ltd. | Services Provided To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided to related parties | 6,209 |  | 1,761 |  |
Jiayin Credit Investigation Service Co., Ltd |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 131 |  |
Amounts due to related parties |  |  |  |  |
Amounts due to related parties | 80 |  |  |  |
Jiayin Credit Investigation Service Co., Ltd | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties |  |  | 196 | 10,513 |
Jiayin Credit Investigation Service Co., Ltd | Loans From Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans from related parties |  |  | 80 | 70,765 |
Geerong Yun (Shanghai) Enterprise Development Co., Ltd. | Services Provided By Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Services provided by related parties |  |  |  | 3,136 |
Geerong Yun (Shanghai) Enterprise Development Co., Ltd. | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties |  |  |  | 3,850 |
Subsidiary Shareholder |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties | 463 |  |  |  |
Amounts due to related parties |  |  |  |  |
Amounts due to related parties | 3,113 |  |  |  |
Subsidiary Shareholder | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties | 463 |  |  |  |
Subsidiary Shareholder | Loans From Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans from related parties | 3,113 |  |  |  |
China Smartpay Group Holdings Limited |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 124,862 |  |
China Smartpay Group Holdings Limited | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties |  |  | 119,924 |  |
Subsidiary Director |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties | 79 |  |  |  |
Subsidiary Director | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties | ¥ 79 |  |  |  |
GAYANG (Hong Kong) Co., Limited |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 1,716 |  |
GAYANG (Hong Kong) Co., Limited | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties |  |  | 1,716 |  |
Shanghai Jiajie Assets Management Co., Ltd |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 800 |  |
Shanghai Jiajie Assets Management Co., Ltd | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties |  |  | 800 | ¥ 7,700 |
SG Fintech Joint Stock Company |  |  |  |  |
Amounts due from related parties |  |  |  |  |
Amounts due from related parties |  |  | 599 |  |
SG Fintech Joint Stock Company | Loans To Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans to related parties |  |  | 598 |  |
Jiayin Financial Leasing (Shanghai) Co., Ltd |  |  |  |  |
Amounts due to related parties |  |  |  |  |
Amounts due to related parties |  |  | 150 |  |
Jiayin Financial Leasing (Shanghai) Co., Ltd | Loans From Related Parties |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Loans from related parties |  |  | ¥ 150 |  |

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