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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |
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Jan. 01, 2017 USD ($) | Jan. 01, 2017 CNY (¥) | Oct. 01, 2016 Segment | Sep. 30, 2017 CNY (¥) | Sep. 30, 2016 Segment | Jun. 30, 2014 | Dec. 31, 2017 USD ($) Segment Reporting_unit shares | Dec. 31, 2017 CNY (¥) Segment Reporting_unit shares | Jun. 29, 2017 USD ($) | Dec. 31, 2016 USD ($) shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2017 CNY (¥) | Dec. 29, 2017
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Official exchange rate of foreign currency remeasured (RMB per one U.S. dollar) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.5063
Impairment of investment |  |  |  |  |  |  | $ 3,114,000 | ¥ 20,258,000 |  |  |  |  |  |  |
Internal use software development costs, Amount capitalized |  |  |  |  |  |  | $ 1,420,000 |  |  |  | ¥ 12,781,000 |  | ¥ 23,780,000 | ¥ 9,238,000 |
Number of reporting units | Reporting_unit |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |
Cash flows estimated growth rate after six years using terminal value |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |
Discount rate used in the valuations based on weighted average cost of capital |  |  |  | 13.00% |  |  | 13.00% |  |  |  | 13.00% |  |  | 13.00% |
Discounted cash flow projection period |  |  |  | 5 years |  |  |  |  |  | 8 years | 8 years |  |  |  |
Impairment losses pursuant to the goodwill tests |  |  |  | ¥ 766,000,000 |  |  | $ 117,800,000 | ¥ 766,440,000 |  |  |  |  |  |  |
Vat rate |  |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |
Business tax expenses and other surcharges |  |  |  |  |  |  |  |  |  | $ 0 |  |  | 6,394,000 |  |
Advertising expense |  |  |  |  |  |  | $ 1,195,000 | ¥ 7,773,000 |  |  | ¥ 20,420,000 |  | ¥ 26,360,000 |  |
Estimated forfeiture rate for management and non-management employees |  |  |  |  |  |  |  |  |  | 1.81% | 1.81% | 1.10% | 1.10% |  |
Share Repurchase Plan, shares repurchased (in shares) | shares |  |  |  |  |  |  | 20,690,892 | 20,690,892 |  | 4,893,150 | 4,893,150 | 0 | 0 |  |
Share Repurchase Plan, share value |  |  |  |  |  |  |  | ¥ 133,126,000 |  |  | ¥ 42,665,000 |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  | 1 |  | 1 | 1 |  |  |  |  |  |  |
Accounting Standards Update 2016-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment to retained earnings | $ 2,058,000 | ¥ 13,425,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Aipu Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted cash flow projection period |  |  |  |  |  |  | 7 years | 7 years |  |  |  |  |  |  |
Long-lived assets impairment |  |  |  |  |  |  |  | ¥ 170,695,000 |  |  |  |  |  |  |
WiFire Group Inc. ("WiFire Group") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discounted cash flow projection period |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |  |  |
Long-lived assets impairment |  |  |  |  |  |  |  | ¥ 231,113,000 |  |  |  |  |  |  |
Short-term investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of investment | $ |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  | $ 0 |  |  |
Option Three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business tax rate |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 3.00% |  |
Option Four |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business tax rate |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% |  |
Deferred Tax Assets Current | Accounting Standards Update 2015-17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of current deferred tax assets to noncurrent deferred tax assets |  |  |  |  |  |  |  |  |  |  | (43,000,000) |  |  |  |
Deferred Tax Assets Noncurrent | Accounting Standards Update 2015-17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification of current deferred tax assets to noncurrent deferred tax assets |  |  |  |  |  |  |  |  |  |  | ¥ 43,000,000 |  |  |  |
American Depository Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan, period |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |
Share Repurchase Plan, shares repurchased (in shares) | shares |  |  |  |  |  |  | 3,448,482 | 3,448,482 |  | 815,525 | 815,525 | 0 | 0 |  |
Share Repurchase Plan, share value |  |  |  |  |  |  | $ 20,461,000 | ¥ 133,126,000 |  |  | ¥ 42,665,000 |  | ¥ 0 |  |
Master Services Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Master service agreement terms |  |  |  |  |  |  | 1 year | 1 year |  |  |  |  |  |  |
Maximum | American Depository Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan, value | $ |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |
Minimum | Capital Leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital lease recognition condition, lease term as a percentage of estimated remaining economic life |  |  |  |  |  |  | 75.00% | 75.00% |  |  |  |  |  |  |
Capital lease recognition condition, minimum lease payments at the beginning of the lease term as a percentage of the fair value of the leased property |  |  |  |  |  |  | 90.00% | 90.00% |  |  |  |  |  |  |

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