XML 23 R52.htm IDEA: XBRL DOCUMENT v2.4.0.6
Share Capital - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Oct. 07, 2011
Sep. 30, 2011
Jun. 30, 2011
Jan. 01, 2011
Class of Stock [Line Items]              
Preferred stock 50,000,000            
Preferred stock par value $ 0.001            
Preferred stock issued 0            
Repurchase of class A common stock       675,000      
Percentage of repurchase of class A common stock       5.00%      
Class A Stock [Member]
              
Class of Stock [Line Items]              
Common stock 50,000,000            
Common stock par value $ 0.001            
Common stock issued 13,515,012   13,572,265 13,572,265      
Common stock outstanding 13,515,012 13,489,162 13,572,265   13,570,945 13,568,945 13,268,522
Repurchase and cancelled stock 114,900            
Total Consideration of repurchase and cancelled stock $ 1.8            
Repurchase and cancelled stock par value $ 15.36            
Class B Stock [Member]
              
Class of Stock [Line Items]              
Common stock 99,680            
Common stock par value $ 0.001            
Common stock issued 99,680   99,680        
Common stock outstanding 99,680   99,680