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Financial Instruments - Schedule of fair value (Detail) ¥ in Thousands, $ in Thousands	Sep. 30, 2020 CNY (¥)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Fair Value, by Balance Sheet Grouping [Line Items]
Time deposits	¥ 817,475	$ 120,401	¥ 1,325,737
Short-term investments	237,418	$ 34,968	121,126
Fair Value Recurring [Member]
Fair Value, by Balance Sheet Grouping [Line Items]
Time deposits	817,475		1,325,737
Short-term investments	237,418		121,126
Total	1,054,893		1,446,863
Fair Value Recurring [Member] | Quoted prices in active market for identical assets (Level 1) [Member]
Fair Value, by Balance Sheet Grouping [Line Items]
Time deposits	817,475		1,325,737
Total	817,475		1,325,737
Fair Value Recurring [Member] | Significant other observable inputs (Level 2) [Member]
Fair Value, by Balance Sheet Grouping [Line Items]
Short-term investments	237,418		121,126
Total	¥ 237,418		¥ 121,126

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- Definition

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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