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Issued Capital and Preference Shares - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 13, 2017 CNY (¥) shares | Jul. 13, 2017 USD ($) $ / shares shares | Jun. 29, 2016 CNY (¥) shares | Jun. 29, 2016 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 $ / shares $ / shares shares | Dec. 31, 2015 $ / shares | Dec. 31, 2016 $ / shares shares | Jul. 04, 2006 $ / shares shares
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend paid per share | $ / shares |  | $ 0.90 |  | $ 0.85 |  | $ 0.90 |  | $ 0.85 | $ 1.10 |  |
Dividend paid in form of cash |  | $ 34,700 |  | $ 17,800 | ¥ 235,947 | $ 37,278 | ¥ 118,193 |  |  |  |
Dividend paid in form of shares | shares | 99,790 | 99,790 | 1,413,760 | 1,413,760 |  |  |  |  |  |  |
Weighted average trading price per share | $ / shares |  | $ 19.0329 |  | $ 11.0227 |  |  |  |  |  |  |
Total value of dividend paid in shares | ¥ 12,897 | $ 2,038 | ¥ 103,356 |  | ¥ 12,897 | $ 2,038 | ¥ 103,356 |  |  |  |
Number of shares issued upon exercise of share options |  |  |  |  | 46,400 | 46,400 |  |  |  |  |
Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares issued upon exercise of share options |  |  |  |  | 46,400 | 46,400 |  |  |  |  |
Ordinary shares [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issue price per share | $ / shares |  |  |  |  |  | $ 0.1 |  |  |  | $ 0.1 |
Ordinary shares [Member] | HL Global Enterprises Limited [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
NCCPS issued | shares |  |  |  |  |  |  |  | 2,899 |  | 2,899 |
Ordinary shares [Member] | Bottom of range [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of special share shall cease to carry any rights in event by HLA | shares |  |  |  |  | 7,290,000 | 7,290,000 |  |  |  |  |
Preference share (Note 24) [Member] | HL Global Enterprises Limited [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [Line Items] |  |  |  |  |  |  |  |  |  |  |
NCCPS issued | shares |  |  |  |  |  |  |  |  |  |  | 197,141,190
Issue price per share | $ / shares |  |  |  |  |  |  |  | $ 0.02 |  |  | $ 0.02
Number of shares converted to ordinary shares in subsidiaries capital | shares |  |  |  |  | 197,011,794 | 197,011,794 | 28,998 |  |  |  |
Issue price per share | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.02 |
NCCPS conversion ratio |  |  |  |  |  |  | 10.00% |  |  |  |

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