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Share Based Payments - Schedule of Restricted Share Activity (Detail) (Restricted Stock Units [Member], USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock Units [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Number of restricted stock units Granted, Beginning Balance 145,261 347,862 353,265
Number of restricted stock units Granted, Granted 978,276 181,087  
Number of restricted stock units Granted, Exercised (118,276) (56,087) (1,069)
Number of restricted stock units Granted, Forfeitures (200,000) (327,601) (4,334)
Number of restricted stock units Granted, Ending Balance 805,261 145,261 347,862
Number of restricted stock units Granted, Units vested 20,261    
Grant-date fair value, Granted $ 1,502 $ 224  
Grant-date fair value, Ending Balance $ 1,340 $ 200  
Grant-date fair value, Units vested $ 69    
Weighted average remaining contractual term 9 years 9 months 4 days 9 years 5 months 12 days 7 years 7 months 6 days
Weighted average remaining contractual term, Units vested 5 years 9 months 29 days