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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