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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 (¥)
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