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Income Tax Expense - Summary of Deferred Tax (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Jan. 01, 2017
CNY (¥)
 [1]
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax liabilities $ (20,437)   ¥ (116,468) [1]   ¥ (136,728) ¥ (115,758)
Deferred tax assets 53,991   315,390 [1]   361,207 ¥ 282,212
Reconciliation of deferred tax (expense) income 307 ¥ 2,052 225 ¥ (48,946)    
Accelerated depreciation [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax liabilities (4,119)   (15,122)   (27,554)  
Reconciliation of deferred tax (expense) income (1,859) (12,432) (4,601) 373    
Unremitted earnings from overseas source income [member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Reconciliation of deferred tax (expense) income       (25)    
Interest receivable [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax liabilities (336)   (774)   (2,252)  
Reconciliation of deferred tax (expense) income (221) (1,478) 679 (1,471)    
Derivatives not designated as hedges - foreign exchange forward contract [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Reconciliation of deferred tax (expense) income       2,326    
PRC withholding tax on dividend income [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax liabilities (15,982)   (100,572)   (106,922)  
Reconciliation of deferred tax (expense) income (4,460) (29,842) (29,031) (16,628)    
Deferred income tax liabilities [member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax liabilities (20,437)   (116,468)   (136,728)  
Reconciliation of deferred tax (expense) income (6,540) (43,752) (32,953) (15,425)    
Impairment of property, plant and equipment [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 2,383   12,319   15,943  
Reconciliation of deferred tax (expense) income 542 3,624 9,443 (9,005)    
Write-down of inventories [member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 2,400   17,493   16,060  
Reconciliation of deferred tax (expense) income (214) (1,433) (3,716) (4,421)    
Allowance for doubtful account receivables [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 774   7,376   5,177  
Reconciliation of deferred tax (expense) income (329) (2,199) (1,964) 7,196    
Accruals [member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 30,576   204,730   204,554  
Reconciliation of deferred tax (expense) income (28) (186) 18,778 (46,350)    
Deferred income [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 14,275   51,679   95,499  
Reconciliation of deferred tax (expense) income 6,550 43,820 6,743 10,045    
Others [Member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 3,583   21,793   23,974  
Reconciliation of deferred tax (expense) income 326 2,178 3,894 9,014    
Deferred Tax Asset [member]            
Disclosure of deferred tax assets and liabilities [Line Items]            
Deferred tax assets 53,991   315,390   ¥ 361,207  
Reconciliation of deferred tax (expense) income $ 6,847 ¥ 45,804 ¥ 33,178 ¥ (33,521)    
[1] Restated