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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis | $ 219,205 | ¥ 1,426,213 | ¥ 874,456
Liabilities measured at fair value on recurring basis | 311,872 | 2,029,128 | 556,432
Available-for-sales Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis | 390 | 2,537 | 7,921
Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis | 304,402 | 1,980,529 | 418,497
Share-settled bonuses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis |  |  | 37,526
Liability Classified RSU |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis | 1,824 | 11,865 | 34,612
Business Acquisition Contingent Consideration | Due to related parties |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis | 5,646 | 36,734 | 65,797
Bank Time Deposits | Short-term investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis | 84,363 | 548,890 | 277,946
Bank Time Deposits | Cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis | $ 134,452 | 874,786 | 588,589
Quoted prices in active markets for identical assets and liabilities (Level 1) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis |  | 1,423,676 | 866,535
Liabilities measured at fair value on recurring basis |  | 1,980,529 | 418,497
Quoted prices in active markets for identical assets and liabilities (Level 1) | Bonds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis |  | 1,980,529 | 418,497
Quoted prices in active markets for identical assets and liabilities (Level 1) | Bank Time Deposits | Short-term investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis |  | 548,890 | 277,946
Quoted prices in active markets for identical assets and liabilities (Level 1) | Bank Time Deposits | Cash equivalents |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis |  | 874,786 | 588,589
Unobservable inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis |  | 2,537 | 7,921
Liabilities measured at fair value on recurring basis |  | 48,599 | 137,935
Unobservable inputs (Level 3) | Available-for-sales Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets measured at fair value on recurring basis |  | 2,537 | 7,921
Unobservable inputs (Level 3) | Share-settled bonuses |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis |  |  | 37,526
Unobservable inputs (Level 3) | Liability Classified RSU |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis |  | 11,865 | 34,612
Unobservable inputs (Level 3) | Business Acquisition Contingent Consideration | Due to related parties |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities measured at fair value on recurring basis |  | ¥ 36,734 | ¥ 65,797

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