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Income Tax Expense - Summary of Deferred Tax (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities ¥ (153,486)   ¥ (136,728)   $ (21,663)
Deferred tax assets 422,960   361,207   59,697
Reconciliation of deferred tax (expense) income 14,274 $ 2,014 2,052 ¥ 225  
Accelerated depreciation [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities (44,920)   (27,554)   (6,340)
Reconciliation of deferred tax (expense) income (17,366) (2,451) (12,432) (4,601)  
Interest receivable [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities (1,644)   (2,252)   (232)
Reconciliation of deferred tax (expense) income 608 86 (1,478) 679  
PRC withholding tax on dividend income [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax liabilities [1] (106,922)   (106,922)   (15,091)
Reconciliation of deferred tax (expense) income [1] (30,721) (4,336) (29,842) (29,031)  
Deferred income tax liabilities [member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Reconciliation of deferred tax (expense) income (47,479) (6,701) (43,752) (32,953)  
Impairment of property, plant and equipment [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 6,648   15,943   938
Reconciliation of deferred tax (expense) income (9,295) (1,312) 3,624 9,443  
Write-down of inventories [member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 18,403   16,060   2,598
Reconciliation of deferred tax (expense) income 2,343 331 (1,433) (3,716)  
Allowance for doubtful account receivables [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 10,077   5,177   1,422
Reconciliation of deferred tax (expense) income 4,900 692 (2,199) (1,964)  
Accruals [member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 250,662   204,554   35,379
Reconciliation of deferred tax (expense) income 46,108 6,508 (186) 18,778  
Deferred income [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 107,731   95,499   15,205
Reconciliation of deferred tax (expense) income 12,232 1,726 43,820 6,743  
Others [Member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 29,439   23,974   4,155
Reconciliation of deferred tax (expense) income 5,465 770 2,178 3,894  
Deferred Tax Asset [member]          
Disclosure of deferred tax assets and liabilities [Line Items]          
Deferred tax assets 422,960   361,207   $ 59,697
Reconciliation of deferred tax (expense) income ¥ 61,753 $ 8,715 ¥ 45,804 ¥ 33,178  
[1] The movement of PRC withholding tax on dividend income is as follows: