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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, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Disclosure of provision matrix [line items]      
Financial assets ¥ 14,303,746 $ 2,018,850 ¥ 13,684,538
Expected credit loss ¥ 57,611 $ 8,131 30,586
Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets     ¥ 438,586
Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 7.20% 7.20% 6.30%
Expected credit loss ¥ 57,611   ¥ 30,586
Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets 794,678   438,586
Current [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets ¥ 601,094   ¥ 281,250
Days past due 0- 90 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 6.90% 6.90% 0.10%
Expected credit loss ¥ 4,283   ¥ 30
Days past due 0- 90 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets ¥ 61,917   47,561
Days Past due 91-180 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 6.20% 6.20%  
Expected credit loss ¥ 1,513    
Days Past due 91-180 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets ¥ 24,409   ¥ 25,862
Days past due 181-365 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 10.90% 10.90% 6.30%
Expected credit loss ¥ 4,386   ¥ 2,990
Days past due 181-365 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets ¥ 40,213   ¥ 47,209
Days past due greater than 365 days [member] | Trade receivables [member]      
Disclosure of provision matrix [line items]      
Expected credit loss rate 70.70% 70.70% 75.10%
Expected credit loss ¥ 47,429   ¥ 27,566
Days past due greater than 365 days [member] | Trade receivables [member] | Cost [member]      
Disclosure of provision matrix [line items]      
Financial assets ¥ 67,045   ¥ 36,704