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Share Capital - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2014
Class A Stock [Member]
Dec. 31, 2013
Class A Stock [Member]
Mar. 31, 2013
Class A Stock [Member]
Dec. 31, 2012
Class A Stock [Member]
Oct. 07, 2011
Class A Stock [Member]
Mar. 31, 2014
Class B Stock [Member]
Dec. 31, 2013
Class B Stock [Member]
Class of Stock [Line Items]                
Preferred stock, authorized 50,000,000              
Preferred stock, par value $ 0.001              
Preferred stock, issued 0              
Common stock, authorized   50,000,000         99,680  
Common stock, par value   $ 0.001         $ 0.001  
Common stock, issued   13,516,626 13,377,967     13,572,265 99,680 99,680
Common stock, outstanding   13,516,626 13,377,967 13,508,318 13,508,318 13,572,265 99,680 99,680
Repurchase of class A common stock 352,823         675,000    
Percentage of repurchase of class A common stock           5.00%    
Number of shares buy back 0