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Fair Value Measurement- Assets and Liabilities Measured or Disclosed at Fair Value (Detail) ¥ in Thousands, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Total assets measured at fair value | ¥ (313,927) |  |  |  |  |  |
Contingent consideration payable |  |  | ¥ 9,014 | $ 1,385 | ¥ 3,377 | ¥ (7,011) |
Total liabilities measured at fair value |  | ¥ 0 |  |  | 0 |  |
Other long-term investments | 1,002,721 | 877,094 | 1,002,721 |  | 877,094 |  | $ 154,115
Total assets measured at fair value | 61,372 | 140,140 | 61,372 |  | 140,140 |  | 9,433
Total liabilities measured at fair value |  | 30,358 |  |  | ¥ 30,358 |  |
Contingent consideration payable | Discount cash flow method |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Discount rate |  |  |  |  | 10.90% |  |
Contingent consideration payable | Discount cash flow method | Minimum [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Probability of achieving performance target |  |  |  |  | 0.00% |  |
Contingent consideration payable | Discount cash flow method | Maximum [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Probability of achieving performance target |  |  |  |  | 100.00% |  |
Available-for-sale Securities [Member] | Probability expected return method |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Discount for lack of marketability |  |  |  |  | 3.81% |  |
Probability of conversion |  |  |  |  | 20.00% |  |
Contingent consideration payable |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale debt security | 6,594 |  |  |  |  |  |
Available-for-sale debt security | 182 | 7,353 | 182 |  | ¥ 7,353 |  | 28
Total losses, Available-for-sale debt security | (6,594) |  |  |  |  |  |
Available-for-sale debt security | 182 | 7,353 | 182 |  | 7,353 |  | 28
Contingent consideration payable |  | 0 |  |  |  |  |
Contingent consideration payable |  | 30,358 |  |  | 30,358 |  |
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Intangible assets, net | (38,862) | (2,889) | (38,862) |  | (2,889) |  |
Investment in equity investees |  | (11,453) |  |  |  |  |
Other long-term investments | (268,432) | (129,616) |  |  |  |  |
Total assets measured at fair value |  | (143,958) |  |  |  |  |
Intangible assets, net | 90 | 370 | 90 |  | 370 |  | 14
Investment in equity investees |  | 0 |  |  | 0 |  |
Other long-term investments | 61,100 | 132,417 | 61,100 |  | 132,417 |  | $ 9,391
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Total assets measured at fair value | 182 |  | 182 |  |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Contingent consideration payable |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale debt security | 182 |  | 182 |  |  |  |
Available-for-sale debt security | 182 |  | 182 |  |  |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Investment in equity investees |  | 0 |  |  | 0 |  |
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Investment in equity investees |  | 0 |  |  | 0 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Total assets measured at fair value | 61,190 | 140,140 | 61,190 |  | 140,140 |  |
Total liabilities measured at fair value |  | 30,358 |  |  | 30,358 |  |
Significant Unobservable Inputs (Level 3) | Contingent consideration payable |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Available-for-sale debt security |  | 7,353 |  |  | 7,353 |  |
Available-for-sale debt security |  | 7,353 |  |  | 7,353 |  |
Contingent consideration payable |  | 30,358 |  |  | 30,358 |  |
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Intangible assets, net | 90 | 370 | 90 |  | 370 |  |
Investment in equity investees |  | 0 |  |  | 0 |  |
Other long-term investments | ¥ 61,100 | ¥ 132,417 | ¥ 61,100 |  | ¥ 132,417 |  |

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