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Leases - Summary of Detailed Information About Future Minimum Rental Receivables Under Non-Cancellable Operating Leases (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥)
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Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | ¥ 37,730 | $ 5,968 | ¥ 51,108
Within 1 Year [member] | Related parties [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 598 | 95 | 902
Within 1 Year [member] | Joint ventures [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 1,425 | 225 | 2,590
Within 1 Year [member] | Third parties [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 5,573 | 882 | 5,058
After 1 Year but within 5 years [member] | Related parties [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 2,358 | 373 | 0
After 1 Year but within 5 years [member] | Joint ventures [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 5,698 | 901 | 10,720
After 1 Year but within 5 years [member] | Third parties [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 7,240 | 1,145 | 13,305
More than 5 years [member] | Joint ventures [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | 10,566 | 1,671 | 14,141
More than 5 years [member] | Third parties [member] |  |  |
Disclosure of maturity analysis of operating lease payments [line items] |  |  |
Future minimum operating leases | ¥ 4,272 | $ 676 | ¥ 4,392

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