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Financial Assets and Financial Liabilities - Schedule of Changes in Liabilities Arising From Financing Activities (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance ¥ 2,115,053   ¥ 2,016,140
Effect of adoption of IFRS 16     96,804
Cash flows 136,159   (11,304)
Addition 15,256   11,473
Accretion of interest 2,198   2,918
Foreign exchange movement 1,228   (1,469)
Translation reserve (116)   491
Ending balance 2,269,778 $ 350,745 2,115,053
Increase (decrease) due to changes in accounting policy [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     2,112,944
Short-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 2,055,046   2,001,014
Cash flows (326,280)   39,979
Foreign exchange movement 1,228   (1,469)
Translation reserve 6   444
Other     15,078
Ending balance 1,730,000 267,334 2,055,046
Short-term borrowings [member] | Increase (decrease) due to changes in accounting policy [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     2,001,014
Long-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     15,078
Cash flows 500,000    
Other     (15,078)
Ending balance 500,000 77,264  
Long-term borrowings [member] | Increase (decrease) due to changes in accounting policy [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     15,078
Obligations under finance leases current [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     14
Effect of adoption of IFRS 16     (14)
Obligations under finance leases noncurrent [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     34
Effect of adoption of IFRS 16     (34)
Lease Liabilities Current [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 28,633    
Effect of adoption of IFRS 16 (37,561)   42,457
Cash flows     (51,283)
Addition 4,039   6,008
Accretion of interest 2,198   2,918
Translation reserve 409   24
Other 25,037   28,509
Ending balance 22,755 3,516 28,633
Lease Liabilities Current [Member] | Increase (decrease) due to changes in accounting policy [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     42,457
Lease Liabilities Noncurrent [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 31,374    
Effect of adoption of IFRS 16     54,395
Addition 11,217   5,465
Translation reserve (531)   23
Other (25,037)   (28,509)
Ending balance ¥ 17,023 $ 2,631 31,374
Lease Liabilities Noncurrent [Member] | Increase (decrease) due to changes in accounting policy [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance     ¥ 54,395