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Share Capital - Changes in Number of Shares of Class A Stock Outstanding (Detail) (Class A Stock [Member])
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Oct. 07, 2011
Class A Stock [Member]
        
Class of Stock [Line Items]        
Class A Stock outstanding, beginning of year 13,508,318 13,572,265 13,268,522 13,572,265
Issued pursuant to shared-based compensation plans 70,227 57,652 303,743  
Repurchased and cancelled pursuant to the stock buy-back (200,578) (121,599)     
Class A Stock outstanding, end of year 13,377,967 13,508,318 13,572,265 13,572,265