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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

Amounts due from major customer.

+ References

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- Definition

The amount of revenues generated through major customer.

+ References

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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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

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