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Investment in Joint Ventures - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2014 CNY (¥)
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | ¥ 5,390,324 |  | ¥ 3,653,914 | ¥ 3,474,364 | $ 851,633 | $ 577,292 | ¥ 2,291,345
Restricted cash | 54,809 |  | 36,000 |  | 8,659 |  |
Bills receivables | 12,150 |  | 0 |  | 1,920 |  |
People's Republic of China [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 67,238 |  | 26,437 |  | 10,623 |  |
Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Capital commitment | 30,000 | $ 4,740 | 10,982 |  |  |  |
Copthorne Hotel Qingdao Co Ltd [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Reversal of impairment |  |  |  | ¥ 21,900 |  |  |
Y & C Engine Co., Ltd. [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 199,925 |  | 99,014 |  |  |  |
Y & C Engine Co., Ltd. [Member] | Outstanding Bills Receivables Discounted With Banks by Retain Recourse Obligation [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Share of outstanding bills receivables | 0 |  | 1,440 |  | 0 |  |
Y & C Engine Co., Ltd. [Member] | Outstanding Bills Receivables Endorsed To Suppliers by Retain Recourse Obligation [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Share of outstanding bills receivables | 23,288 |  | 5,113 |  | 3,679 |  |
Joint Ventures [Member] |  |  |  |  |  |  |
Disclosure of joint ventures [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents | 312,980 |  | 99,014 |  | 49,449 |  |
Restricted trade receivables | 6,766 |  | 34,403 |  | 1,069 |  |
Restricted cash | ¥ 80,452 |  | ¥ 18,119 |  | $ 12,711 |  |

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