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Goodwill - Summary of Goodwill (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($)
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Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |  |
Beginning Balance | ¥ 212,636 | $ 33,595 |  |
Ending Balance | 212,636 | 33,595 | ¥ 212,636 | $ 33,595
Cost [Member] |  |  |  |
Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |  |
Beginning Balance | 218,311 | 34,492 | 218,311 | 34,492
Ending Balance | 218,311 | 34,492 | 218,311 | 34,492
Accumulated impairment [Member] |  |  |  |
Disclosure of reconciliation of changes in goodwill [Line Items] |  |  |  |
Beginning Balance | 5,675 | 897 | 5,675 | 897
Ending Balance | ¥ 5,675 | $ 897 | ¥ 5,675 | $ 897

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