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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Mar. 31, 2019 | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2021 USD ($) | Jan. 01, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash |  | ¥ 970,993,759 | ¥ 61,293,114 |  | ¥ 9,693,008 | ¥ 970,993,759 | $ 9,618,227 |  |
Impairment loss |  |  | 0 |  | 0 | 0 |  |  |
Employee defined contribution plan expensed |  |  | 87,227,402 | $ 13,687,883 | 35,451,168 | 66,584,898 |  |  |
VAT incurred |  | 130,059,457 | 478,981,515 |  | 207,266,214 | 130,059,457 | 75,162,652 |  |
Exchange rate |  |  | 6.3726 | 1.00 |  |  |  |  |
Contract assets |  |  | 1,325,397,497 |  | 645,992,745 |  | 207,983,789 |  |
Unsatisfied performance obligations |  |  | 5,461,882 |  | 38,381,520 |  | 857,088 |  |
Unrealized gains (losses) on interest rate swap contracts |  |  |  |  |  | 3,300,000 |  |  |
Right-of-use assets |  |  | 97,000,000 |  |  |  | 15,000,000 |  |
Lease liabilities |  |  | 94,000,000 |  |  |  | 15,000,000 |  |
Financing receivables written off |  |  | 140,834,287 | 22,099,973 | 66,742,161 |  |  |  |
Post Origination Administrative Services Revenue |  |  | 41,561,564 | 6,521,916 | 73,775,464 | 86,251,498 |  |  |
Adjustments due to the adoption of ASC 606 |  | ¥ 5,491,660,291 | 6,990,566,821 |  | 8,375,209,137 | ¥ 5,491,660,291 | $ 1,096,972,480 | ¥ 17,585,853 | ¥ 5,255,366,828
Contract with Customer, Liability, Revenue Recognized |  |  | ¥ 89,300,000 | 14,100,000 | ¥ 34,900,000 |  |  |  |
Lessee, Operating Lease, Term of Contract |  |  | 12 months |  |  |  | 12 months |  |
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration] |  |  | Lease liabilities |  | Lease liabilities |  | Lease liabilities |  |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] |  |  | Assets, Current |  | Assets, Current |  | Assets, Current |  |
Cross Currency Interest Rate Contract [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Outstanding notional amount of interest rate swap contracts |  |  | ¥ 103.6 |  | ¥ 0 |  | $ 16.3 |  |
Unrealized gains (losses) on interest rate swap contracts |  |  | ¥ 5,300,000 | $ 800,000 | ¥ 0 |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Financial Institutions [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of revenue generated from customers |  |  | 10.00% | 10.00% | 36.50% | 39.10% |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Financial Institutions [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Percentage of revenue generated from customers |  |  | 16.80% | 16.80% |  |  |  |  |
General VAT [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rate |  |  | 6.00% | 6.00% |  |  |  |  |
Small Scale VAT [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rate |  |  | 3.00% | 3.00% |  |  |  |  |
General Collaboration Deposits [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash |  |  | ¥ 149,343,409 |  | ¥ 140,785,028 |  | 23,435,240 |  |
Guarantee Deposits Risk Assured Arrangements [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash |  |  | ¥ 974,336,804 |  | 747,207,120 |  | 152,894,706 |  |
Collateral for Short-term Borrowings [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  | ¥ 51,793,630 |  | $ 8,127,551 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  | 6 years | 6 years |  |  |  |  |
Minimum [Member] | Automobile Sales [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rate | 6.00% |  |  |  |  |  |  |  |
Minimum [Member] | Electronic Technology [member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rate |  | 6.00% |  |  |  |  |  |  |
Minimum [Member] | Computer Software [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  | 6 years | 6 years |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  | 10 years | 10 years |  |  |  |  |
Maximum [Member] | Automobile Sales [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rate | 16.00% |  |  |  |  |  |  |  |
Maximum [Member] | Electronic Technology [member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Applicable tax rate |  | 13.00% |  |  |  |  |  |  |
Maximum [Member] | Computer Software [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Estimated useful life of intangible assets |  |  | 10 years | 10 years |  |  |  |  |
Weighted Average [Member] | Computer Software, Intangible Asset [Member] |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Weighted average amortization period |  |  | 9 years 1 month 9 days | 9 years 1 month 9 days | 9 years 3 months 3 days |  |  |  |

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