Additional Information - Condensed Financial Statements of the Company (Balance Sheets) (Parenthetical) (Details) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Class A ordinary shares [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.01	$ 0.01
Ordinary shares, shares authorized	680,000,000	680,000,000
Ordinary shares, shares issued and outstanding	254,909,790	253,250,854
Class B ordinary shares [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.01	$ 0.01
Ordinary shares, shares authorized	320,000,000	320,000,000
Ordinary shares, shares issued and outstanding	317,325,360	317,325,360
Parent Company [Member] \| Class A ordinary shares [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.01	$ 0.01
Ordinary shares, shares authorized	680,000,000	680,000,000
Ordinary shares, shares issued and outstanding	254,909,790	253,250,854
Parent Company [Member] \| Class B ordinary shares [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.01	$ 0.01
Ordinary shares, shares authorized	320,000,000	320,000,000
Ordinary shares, shares issued and outstanding	317,325,360	317,325,360

Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: 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(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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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

No definition available.

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