Segment Information - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2017 CNY (¥) Segments	Dec. 31, 2017 USD ($) Segments	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Disclosure of operating segments [Line Items]
Number of reportable segments	2	2
Revenue	¥ 16,222,442	$ 2,563,030	¥ 13,664,840	¥ 13,733,437
Customer One [Member]
Disclosure of operating segments [Line Items]
Revenue	¥ 4,839,617	$ 764,625	¥ 3,580,856	¥ 2,900,332

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.

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+ Details