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Summary of Significant Accounting Policies - Schedule of Guarantee and Quality Assurance Fund Obligations Movement Activities (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Accounting Policies [Abstract] |  |  |  |
Opening balance | ¥ 3,819,379 |  | ¥ 2,062,844 | ¥ 473,704
Fair value of newly written guarantee and quality assurance obligation | 6,156,826 |  | 5,313,489 | 3,318,432
Release of guarantee and quality assurance payable upon repayment | (6,718,809) |  | (4,049,457) | (2,506,141)
Contingent liability | 6,409,884 |  | 3,380,930 | 2,527,209
Payouts during the year | (12,299,134) |  | (7,889,277) | (4,812,797)
Recoveries during the year | 7,408,007 |  | 5,000,850 | 3,062,437
Ending balance | ¥ 4,776,153 | $ 686,051 | ¥ 3,819,379 | ¥ 2,062,844

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- Definition Release of guarantee and quality assurance payable upon repayment. + References No definition available. + Details
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- References No definition available. + Details
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