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Finance Lease Receivables, Net - Summary of Analysis of Aging Finance Lease Receivables Principal (Detail) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Finance lease receivables | ¥ 2,366,189,534 | $ 371,306,770 | ¥ 3,423,777,666
Aging of finance lease receivables principal | 2,475,643,558 | 388,482,497 | 3,513,623,809
1 to 30 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Aging of finance lease receivables principal, past due | 90,969,086 | 14,275,035 | 68,919,540
31 to 60 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Aging of finance lease receivables principal, past due | 6,290,856 | 987,173 | 7,515,295
61 to 90 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Aging of finance lease receivables principal, past due | 3,656,847 | 573,839 | 5,260,689
91 to 120 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Aging of finance lease receivables principal, past due | 3,868,995 | 607,130 | 3,678,200
121 to 150 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Aging of finance lease receivables principal, past due | 2,201,790 | 345,509 | 2,570,865
151 to 180 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Aging of finance lease receivables principal, past due | ¥ 2,466,450 | $ 387,041 | ¥ 1,901,554

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