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Investments in Subsidiaries - Additional Information (Detail) ¥ in Millions, $ in Millions | Feb. 28, 2019 CNY (¥) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Feb. 28, 2019 USD ($)
--- | --- | --- | --- | --- | ---
Disclosure of subsidiaries [line items] |  |  |  |  |
Cash and cash equivalents subject to local exchange control regulations |  | ¥ 5,289.2 | $ 817.3 | ¥ 5,112.8 |
Bottom of range [member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Percent of shareholding in subsidiary | 67.50% |  |  |  |
Top of range [member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Percent of shareholding in subsidiary | 75.00% |  |  |  |
YC Europe Co [member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Percentage of equity interest acquired | 7.50% |  |  |  | 7.50%
Cash consideration | ¥ 0.1 |  |  |  | $ 0.1

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