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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | The changes in the carrying amount of goodwill were as follows:
|  | December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Balance as of January 1 |  |  | 1,755,970 |  |  |  | 1,755,970 |  |  |  | 1,755,970 |  |  |  | 269,888 |
Impairment |  |  | — |  |  |  | — |  |  |  | (766,440 | ) |  |  | (117,800 | )
Balance as of December 31 |  |  | 1,755,970 |  |  |  | 1,755,970 |  |  |  | 989,530 |  |  |  | 152,088 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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