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Condensed Balance Sheets (Parenthetical) (Detail) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.0005	$ 0.0005
Ordinary shares, shares authorized	94,100,000	94,100,000
Ordinary shares, shares issued	28,279,528	27,962,586
Ordinary shares, shares outstanding	27,434,389	27,962,586
Ordinary shares, treasury stock	845,139
Parent Company
Condensed Financial Statements, Captions [Line Items]
Ordinary shares, par value	$ 0.0005	$ 0.0005
Ordinary shares, shares authorized	94,100,000	94,100,000
Ordinary shares, shares issued	28,279,528	27,962,586
Ordinary shares, shares outstanding	27,434,389	27,962,586
Ordinary shares, treasury stock	845,139

X

- Definition

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 129

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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X

- Definition

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

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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.

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

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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.

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