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Financial Risk Management Objectives and Policies - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) Customer | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 CNY (¥) Customer | Dec. 31, 2017 USD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Basis points | 0.50% |  | 0.50% | 0.50%
Increase decrease in profit before tax on basis of higher lower basis points | ¥ 22,015 | $ 3,478 | ¥ 15,712 |
Customers with Trade Receivable Balances Over Threshold [Member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Percentage of trade receivables excluding bills receivables | 73.80% | 73.80% | 79.60% |
Number of major customers | 44 | 44 | 38 |
Threshold of trade receivables excluding bills receivables defining major customer | ¥ 1,000 | $ 158 |  |
People's Republic of China [Member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Number of top customers | 20 | 20 | 20 |
People's Republic of China [Member] | Top 20 Customers [Member] |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |
Amount owed | ¥ 57,220 |  | ¥ 151,033 | $ 9,040
Percentage of trade receivables excluding bills receivables | 22.40% | 22.40% | 51.10% |

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