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Share Based Payments - Schedule of Restricted Share Activity (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Weighted average remaining contractual term 8 years 7 months 6 days 8 years  
Weighted average remaining contractual term, Units vested 6 years 9 months 18 days    
Restricted Share [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Grant-date fair value, Granted     $ 605
Weighted average remaining contractual term 9 years 5 months 12 days 7 years 7 months 6 days  
Number of restricted share Granted, Beginning Balance 347,862 353,265 463,779
Weighted average remaining contractual term, Units vested 6 years 9 months 18 days    
Grant-date fair value, Granted $ 224    
Grant-date fair value, Granted $ 200    
Grant-date fair value, Units vested $ 55    
Number of restricted share Granted, Granted 181,087   100,000
Number of restricted share Granted, Exercised (56,087) (1,069) (5,910)
Number of restricted share Granted, Forfeitures (327,601) (4,334) (204,604)
Number of restricted share Granted, Ending Balance 145,261 347,862 353,265
Number of restricted share Granted, Units vested 16,209