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Summary of significant accounting policies - Additional Information (Detail)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Peoples' Republic of China [Member]
USD ($)
Dec. 31, 2011
Peoples' Republic of China [Member]
USD ($)
Dec. 31, 2012
UNITED STATES [Member]
USD ($)
Dec. 31, 2011
UNITED STATES [Member]
USD ($)
Dec. 31, 2012
UBS Jersey Call Certificate [Member]
USD ($)
Unit
Dec. 31, 2012
Non Capital Preservation Wealth Management Product [Member]
CNY
Dec. 31, 2011
Continuing Operations [Member]
UNITED STATES [Member]
USD ($)
Dec. 31, 2011
Discontinuing Operations [Member]
UNITED STATES [Member]
USD ($)
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Non Capital Preservation Wealth Management Product [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Non Capital Preservation Wealth Management Product [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                              
Cash and bank deposits       $ 2,009,000 $ 4,438,000 $ 5,200,000 $ 193,000     $ 39,000 $ 154,000        
Financial Product , Units               50              
Financial Product , Par value               50,000              
Financial Product , Fair value               2,530,000              
Financial Product, estimated maximum annual yield                         2.15%   3.55%
Financial Product, Term                 5 years            
Financial Product, Par Value                 2,000,000            
Proceeds from redemption of financial product                 2,025,000            
FDIC Insurance limit 250,000                            
Estimated useful life minimum years                       6 months   4 years 4 months 24 days  
Advertising service revenue on a straight-line basis                       1 month   2 years  
Advertising and promotion costs $ 3,573,000 $ 3,852,000 $ 1,834,000                        
Contributions to PRC employee                       18.00%   20.00%  
Employer contribution to the scheme 5.00%                            
Recognized income tax positions 50.00%                            
Advertising service revenue rate 10.00% 10.00% 10.00%                        
Total long lived assets rate 10.00%