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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, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance ¥ 2,016,140   ¥ 1,626,420
Effect of adoption of IFRS 16 96,804    
Cash flows (11,304)   388,531
Addition 11,473    
Accretion of interest 2,918    
Foreign exchange movement (1,469)   389
Translation reserve 491   800
Ending balance 2,115,053 $ 298,521 2,016,140
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    
Ending balance     2,112,944
Short-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 2,001,014   1,600,000
Cash flows 39,979   400,320
Foreign exchange movement (1,469)   694
Translation reserve 444    
Other 15,078    
Ending balance 2,055,046 290,052 2,001,014
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    
Ending balance     2,001,014
Long-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 15,078   26,341
Cash flows     (11,756)
Foreign exchange movement     (305)
Translation reserve     798
Other (15,078)    
Ending balance     15,078
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    
Ending balance     15,078
Obligations under finance leases current [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 14   33
Effect of adoption of IFRS 16 (14)    
Cash flows     (33)
Other     14
Ending balance     14
Obligations under finance leases noncurrent [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance 34   46
Effect of adoption of IFRS 16 (34)    
Translation reserve     2
Other     (14)
Ending balance     34
Lease Liabilities Current [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Effect of adoption of IFRS 16 42,457    
Cash flows (51,283)    
Addition 6,008    
Accretion of interest 2,918    
Translation reserve 24    
Other 28,509    
Ending balance 28,633 4,041  
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    
Ending balance     42,457
Lease Liabilities Noncurrent [Member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Effect of adoption of IFRS 16 54,395    
Addition 5,465    
Translation reserve 23    
Other (28,509)    
Ending balance 31,374 $ 4,428  
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    
Ending balance     ¥ 54,395