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Segment Information - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 CNY (¥) Segments | Dec. 31, 2020 USD ($) Segments | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Disclosure of operating segments [line items] |  |  |  |
Number of reportable segments | 2 | 2 |  |
Revenue | ¥ 20,581,170 | $ 3,180,376 | ¥ 18,016,085 | ¥ 16,263,248
One customer group [member] |  |  |  |
Disclosure of operating segments [line items] |  |  |  |
Revenue | ¥ 6,018,200 | $ 930,000 | ¥ 5,205,500 | ¥ 4,463,900

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