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Summary of Significant Accounting Policies - Disaggregation of Revenue (Detail) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | ¥ 4,228,095 | ¥ 3,345,901
Without Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 627,993 | 941,664
Loan facilitation service fees [Member] | Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 2,984,063 | 2,404,178
Loan facilitation service fees [Member] | Without Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 326,812 | 515,056
Post-facilitation service fees [Member] | Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 1,096,660 | 678,518
Post-facilitation service fees [Member] | Without Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 103,713 | 244,279
Other Revenue [Member] | Quality Assurance Program [Member] | Investment Management Fees [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 109,423 | 208,471
Other Revenue [Member] | Quality Assurance Program [Member] | Other Revenues [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 37,949 | 54,734
Other Revenue [Member] | Without Quality Assurance Program [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors |  | 68,619
Other Revenue [Member] | Without Quality Assurance Program [Member] | Borrowers Referral Fee [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | 130,677 | 96,167
Other Revenue [Member] | Without Quality Assurance Program [Member] | Other Revenues [Member] |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |
Changes in expected discretionary payment to IRF investors | ¥ 66,791 | ¥ 17,543

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