Segment Information - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2019 CNY (¥) Segments	Dec. 31, 2019 USD ($) Segments	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Disclosure of operating segments [line items]
Number of reportable segments	2	2
Revenue	¥ 18,016,085	$ 2,542,813	¥ 16,263,248	¥ 16,197,819
One customer group [member]
Disclosure of operating segments [line items]
Revenue	¥ 5,205,500	$ 734,700	¥ 4,463,900	¥ 4,839,600

Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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+ Details