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Segment Information - Summary of Geographic Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($)
Disclosure of geographical areas [Line Items] |  |  |  |  |
Revenue from external customers | ¥ 16,222,442 | $ 2,563,030 | ¥ 13,664,840 | ¥ 13,733,437 |
Non-current assets | 4,619,767 |  | 4,988,768 |  | $ 729,890
People's Republic of China [Member] |  |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |  |
Revenue from external customers | 16,116,356 | 2,546,269 | 13,508,721 | 13,630,979 |
Non-current assets | 4,524,988 |  | 4,893,338 |  | 714,916
Other Countries [Member] |  |  |  |  |
Disclosure of geographical areas [Line Items] |  |  |  |  |
Revenue from external customers | 106,086 | $ 16,761 | 156,119 | ¥ 102,458 |
Non-current assets | ¥ 94,779 |  | ¥ 95,430 |  | $ 14,974

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