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Income Tax Expense - Summary of Deferred Tax (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2020
USD ($)
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities ¥ (112,456)   ¥ (153,486)   $ (17,378)
Deferred tax assets 400,198   422,960   61,842
Net deferred tax assets 287,742   269,474   44,464
Reconciliation of deferred tax (expense) income (12,408) $ (1,918) 14,274 ¥ 2,052  
Accelerated depreciation [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities (100,802)   (44,920)   (15,577)
Reconciliation of deferred tax (expense) income (55,882) (8,635) (17,366) (12,432)  
Interest receivable [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities (1,937)   (1,644)   (299)
Reconciliation of deferred tax (expense) income (293) (45) 608 (1,478)  
PRC withholding tax on dividend income [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities [1] (112,456)   (106,922)   (17,378)
Reconciliation of deferred tax (expense) income [1] (36,255) (5,602) (30,721) (29,842)  
Impairment of property, plant and equipment [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 40,104   6,648   6,197
Reconciliation of deferred tax (expense) income 33,456 5,170 (9,295) 3,624  
Write-down of inventories [member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 22,628   18,403   3,497
Reconciliation of deferred tax (expense) income 4,225 653 2,343 (1,433)  
Allowance for doubtful account receivables [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 8,056   10,077   1,245
Reconciliation of deferred tax (expense) income (2,021) (312) 4,900 (2,199)  
Accruals [member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 298,766   250,662   46,168
Reconciliation of deferred tax (expense) income 48,149 7,440 46,108 (186)  
Deferred income [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 108,942   107,731   16,834
Reconciliation of deferred tax (expense) income 1,211 187 12,232 43,820  
Others [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 24,441   29,439   $ 3,777
Reconciliation of deferred tax (expense) income ¥ (4,998) $ (774) ¥ 5,465 ¥ 2,178  
[1] The movement of PRC withholding tax on dividend income is as follows: