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Investment in Joint Ventures - Additional Information (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Disclosure of joint ventures [line items] |  |  |  |  |  |
Share of capital commitment | ¥ 2,100 | $ 300 | ¥ 81,000 |  |  |
Cash and cash equivalents | 5,877,647 | 908,264 | 5,753,268 | $ 889,044 | ¥ 5,559,890 | ¥ 5,390,324
People's Republic of China [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 30,400 | 4,700 | 44,800 |  |  |
Y & C Engine Co., Ltd. [Member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 160,844 |  | 164,942 |  |  |
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 | 40,100 | 6,200 | 45,000 |  |  |
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 | 58,400 | 9,000 | 11,400 |  |  |
Joint ventures [member] |  |  |  |  |  |
Disclosure of joint ventures [line items] |  |  |  |  |  |
Cash and cash equivalents | 206,173 | 31,860 | 228,774 |  |  |
Share of restricted cash | 65,200 | 10,100 | 60,800 |  |  |
Bills receivables | ¥ 28,600 | $ 4,400 | ¥ 50,800 |  |  |

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