Prepayments on long-term assets - Additional Information (Detail) - CNY (¥)	Dec. 21, 2021	Dec. 31, 2023	Dec. 31, 2022
Payments on buildings	¥ 112,855,500
Aggregate amount of taxes payment	¥ 50,000,000
Other commitment		¥ 0	¥ 0
Other taxes payable in phases		50,000,000
Other Taxes Payable To Acquire Premises [Member]
Other commitment		¥ 50,000,000

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant