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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