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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, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   ¥ 1,626,420 ¥ 910,514
Cash flows   388,531 714,447
Foreign exchange movement   389 1,634
Translation reserve   800 (175)
Ending balance $ 301,362 2,016,140 1,626,420
Short-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   1,600,000 894,136
Cash flows   400,320 705,109
Foreign exchange movement   694 755
Ending balance 299,101 2,001,014 1,600,000
Long-term borrowings [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   26,341 16,270
Cash flows   (11,756) 9,376
Foreign exchange movement   (305) 879
Translation reserve   798 (184)
Ending balance 2,254 15,078 26,341
Obligations under finance leases current [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   33 38
Cash flows   (33) (38)
Translation reserve     9
Other   14 24
Ending balance 2 14 33
Obligations under finance leases noncurrent [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Beginning balance   46 70
Translation reserve   2  
Other   (14) (24)
Ending balance $ 5 ¥ 34 ¥ 46