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Income Tax Expense - Summary of Deferred Tax (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax liabilities | ¥ (116,468) |  | ¥ (115,758) |  | $ (18,401)
Deferred tax assets | 315,390 |  | 308,207 |  | 49,829
Reconciliation of deferred tax (expense) income | (25,770) | $ (4,071) | (48,946) | ¥ (72,281) |
Accelerated depreciation [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax liabilities | (15,122) |  | (10,521) |  | (2,389)
Reconciliation of deferred tax (expense) income | (4,601) | (727) | 373 | (10,852) |
Unremitted earnings from overseas source income [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax liabilities |  |  | (437) |  |
Reconciliation of deferred tax (expense) income |  |  | (25) |  |
Interest receivable [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax liabilities | (774) |  | (1,453) |  | (122)
Reconciliation of deferred tax (expense) income | 679 | 107 | (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 | (2,326) |
PRC withholding tax on dividend income [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax liabilities | (100,572) |  | (103,347) |  | (15,890)
Reconciliation of deferred tax (expense) income | (29,031) | (4,587) | (16,628) | (12,549) |
Deferred income tax liabilities [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Reconciliation of deferred tax (expense) income | (32,953) | (5,207) | (15,425) | (25,727) |
Impairment of property, plant and equipment [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets | 12,319 |  | 2,876 |  | 1,946
Reconciliation of deferred tax (expense) income | 9,443 | 1,492 | (9,005) | 409 |
Write-down of inventories [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets | 17,493 |  | 21,209 |  | 2,764
Reconciliation of deferred tax (expense) income | (3,716) | (587) | (4,421) | (3,867) |
Allowance for doubtful account receivables [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets | 7,376 |  | 9,340 |  | 1,165
Reconciliation of deferred tax (expense) income | (1,964) | (310) | 7,196 | (3,361) |
Accruals [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets | 204,730 |  | 185,952 |  | 32,346
Reconciliation of deferred tax (expense) income | 18,778 | 2,967 | (46,350) | 17,253 |
Deferred income [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets | 51,679 |  | 70,931 |  | 8,165
Reconciliation of deferred tax (expense) income | (19,252) | (3,042) | 10,045 | (44,232) |
Write down of intangible asset [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Reconciliation of deferred tax (expense) income |  |  |  | (15,000) |
Others [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Deferred tax assets | 21,793 |  | 17,899 |  | $ 3,443
Reconciliation of deferred tax (expense) income | 3,894 | 616 | 9,014 | 2,244 |
Deferred Tax Asset [Member] |  |  |  |  |
Disclosure of deferred tax assets and liabilities [Line Items] |  |  |  |  |
Reconciliation of deferred tax (expense) income | ¥ 7,183 | $ 1,136 | ¥ (33,521) | ¥ (46,554) |

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