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Short-Term and Long-Term Debts - Summary of Long-Term Debts (Detail) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term debts | ¥ 1,424,386,034 | $ 223,517,251 | ¥ 2,206,574,921
Long Term Borrowings [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Term |  |  | 36 months
Long-term debts | ¥ 469,941,863 | $ 73,744,133 | ¥ 107,055,556
Long Term Borrowings [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Fixed annual rate | 4.45% | 4.45% | 4.75%
Long-term debts, Term | 15 months | 15 months |
Long Term Borrowings [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Fixed annual rate | 6.00% | 6.00% | 6.00%
Long-term debts, Term | 36 months | 36 months |
Securitization Debts Payable [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts |  |  | ¥ 401,761,874
Securitization Debts Payable [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Fixed annual rate |  |  | 4.73%
Long-term debts, Term |  |  | 18 months
Securitization Debts Payable [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Fixed annual rate |  |  | 6.00%
Long-term debts, Term |  |  | 20 months
Co-financing Debt Payables [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts | ¥ 954,444,171 | $ 149,773,118 | ¥ 1,697,757,491
Co-financing Debt Payables [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Fixed annual rate | 5.50% | 5.50% | 5.50%
Long-term debts, Term | 24 months | 24 months | 24 months
Co-financing Debt Payables [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debts, Fixed annual rate | 6.60% | 6.60% | 6.60%
Long-term debts, Term | 36 months | 36 months | 36 months

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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