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Concentration of Risks - Additional Information (Detail) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2013 USD ($) Segment | Dec. 31, 2013 CNY Segment | Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Sep. 30, 2014 USD ($) | Sep. 30, 2014 CNY | Sep. 30, 2013 CNY | Dec. 31, 2010 CNY | Dec. 31, 2013 Internet Content Provider Business [Member] Maximum [Member] | Dec. 31, 2013 Advertising Services [Member] | Dec. 31, 2013 Consolidated VIEs [Member] China [Member] USD ($) | Dec. 31, 2013 Consolidated VIEs [Member] China [Member] CNY | Dec. 31, 2013 Subsidiaries [Member] China [Member] USD ($) | Dec. 31, 2013 Subsidiaries [Member] China [Member] CNY | Dec. 31, 2013 Credit Concentration Risk [Member] USD ($) | Dec. 31, 2013 Credit Concentration Risk [Member] CNY | Dec. 31, 2012 Credit Concentration Risk [Member] CNY | Dec. 31, 2013 Customer Concentration Risk [Member] Net Revenue [Member] Customer | Dec. 31, 2012 Customer Concentration Risk [Member] Net Revenue [Member] Customer | Dec. 31, 2011 Customer Concentration Risk [Member] Net Revenue [Member] Customer | Dec. 31, 2013 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer | Dec. 31, 2012 Customer Concentration Risk [Member] Accounts Receivable [Member] Customer
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 185,502 | 1,138,613 | $ 69,474 | 420,576 | 213,705 | $ 130,035 | 798,155 | 437,442 | 174,342 |  |  | $ 16,404 | 99,307 | $ 65,141 | 394,345 | $ 228,556 | 1,383,613 | 420,576 |  |  |  |  |
Number of operating segment | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit risk, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  | 10.00% |
Number of customers represented greater than 10% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 1 | 1 | 0
Ownership percentage |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum years track record in principal business |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Appreciation of the RMB against US$ | 2.90% | 2.90% | 1.00% | 1.00% | 4.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The business operation period represents that PRC regulations require any foreign entities that invest in the advertising services industry to have at least a two-year track record with a principal business in the advertising industry outside of China. + References No definition available. + Details
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- Definition Concentration Risk Number Of Major Customers + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + 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 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: 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=6927468&loc=d3e6404-108592 Reference 3: 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=28364263&loc=d3e13531-108611 Reference 4: 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=6927468&loc=d3e6351-108592 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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