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Financial Risk Management Objectives and Policies - Summary of Information about Credit Risk on Trade Receivables using Provision Matrix (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Disclosure of provision matrix [line items]      
Financial assets $ 2,045,037 ¥ 13,681,509 ¥ 13,218,760
Expected credit loss $ 4,572 ¥ 30,586 43,775
Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 6.30% 6.30%  
Expected credit loss   ¥ 30,586 43,775
Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets   483,020 255,879
Trade receivables [member] | Cost [member] | Contract assets [member]      
Disclosure of provision matrix [line items]      
Financial assets   44,434  
Current [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets   ¥ 281,250 99,908
Days past due 0- 90 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 0.10% 0.10%  
Expected credit loss   ¥ 30  
Days past due 0- 90 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets   47,561 59,967
Days Past due 91-180 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets   ¥ 25,862 21,623
Days past due 181-365 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 6.30% 6.30%  
Expected credit loss   ¥ 2,990 661
Days past due 181-365 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets   ¥ 47,209 30,353
Days past due greater than 365 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 75.10% 75.10%  
Expected credit loss   ¥ 27,566 43,114
Days past due greater than 365 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets   ¥ 36,704 ¥ 44,028