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Condensed Financial Information of the Parent Company - Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Class A Ordinary Shares [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, shares outstanding	48,777,835us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	36,347,496us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class A Ordinary Shares [Member] | Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, par value	0.01us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Ordinary shares, shares authorized	99,931,211,060us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	99,931,211,060us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Ordinary shares, shares issued	48,777,835us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	36,347,496us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Ordinary shares, shares outstanding	48,777,835us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	36,347,496us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B Ordinary Shares [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, shares outstanding	61,824,328us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	68,788,940us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Class B Ordinary Shares [Member] | Parent Company [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Ordinary shares, par value	0.01us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ordinary shares, shares authorized	68,788,940us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	68,788,940us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ordinary shares, shares issued	61,824,328us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	68,788,940us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Ordinary shares, shares outstanding	61,824,328us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	68,788,940us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

X

- Definition

Face amount or stated value per share of common stock.

+ 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)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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X

- Definition

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

+ 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



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X

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ 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 SEC

-Name Regulation S-X (SX)

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-Paragraph 30

-Article 5

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Balance Type:	na
Period Type:	instant

X

- 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

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