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Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.0005us-gaap_CommonStockParOrStatedValuePerShare	$ 0.0005us-gaap_CommonStockParOrStatedValuePerShare
Ordinary shares, shares authorized	94,100,000us-gaap_CommonStockSharesAuthorized	94,100,000us-gaap_CommonStockSharesAuthorized
Ordinary shares, shares issued	29,123,118us-gaap_CommonStockSharesIssued	28,715,882us-gaap_CommonStockSharesIssued
Ordinary shares, shares outstanding	28,055,302us-gaap_CommonStockSharesOutstanding	27,648,066us-gaap_CommonStockSharesOutstanding
Ordinary shares, treasury stock	1,067,816us-gaap_TreasuryStockShares	1,067,816us-gaap_TreasuryStockShares
Parent Company
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.0005us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	$ 0.0005us-gaap_CommonStockParOrStatedValuePerShare / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ordinary shares, shares authorized	94,100,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	94,100,000us-gaap_CommonStockSharesAuthorized / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ordinary shares, shares issued	29,123,118us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	28,715,882us-gaap_CommonStockSharesIssued / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ordinary shares, shares outstanding	28,055,302us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	27,648,066us-gaap_CommonStockSharesOutstanding / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Ordinary shares, treasury stock	1,067,816us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember	1,067,816us-gaap_TreasuryStockShares / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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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-Name Regulation S-X (SX)

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-Section 02

-Paragraph 30

-Article 5

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Balance Type:	na
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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

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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)

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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

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X

- Definition

Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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