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Basis of Presentation - Additional Information (Detail) ¥ in Billions, $ in Billions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) | Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Net assets of VIEs | $ 1.4 | ¥ 9.6 |
Creditors of the VIEs'third-party liabilities with no recourse to the general credit of the primary beneficiaries | No |  |
Exchange rate used for conversion of financial statements from RMB to US dollar |  |  | 6.8680

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