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Certain Risks and Concentration (Major Customers) (Details) - Customer concentration risk [Member] ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2016 USD ($)
Total revenues [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Threshold of business risk associated with percentage of quantitative amount generated by any single customer of the Group (as a percent) | 10.00% | 10.00% |  |  |
Total revenues [Member] | CMCC [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenues generated through and from CMCC | ¥ 154.6 | $ 22.3 | ¥ 309.3 | ¥ 320.4 |
Percentage of concentration risk | 10.70% | 10.70% | 19.20% | 19.60% |
Total accounts receivable, net and due from related parties [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Threshold of business risk associated with percentage of quantitative amount generated by any single customer of the Group (as a percent) | 10.00% | 10.00% |  |  |
Total accounts receivable, net and due from related parties [Member] | CMCC [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Amounts due from CMCC | ¥ 48.8 |  | ¥ 58.3 |  | $ 7.0

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- Definition Threshold of business risk associated with percentage of quantitative amount, like revenues or accounts receivable, generated by any single customer of the Group. + References No definition available. + Details
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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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