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Capital Structure - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]    
Preferred stock, shares authorized 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized
Class B Common Stock [Member]    
Class of Stock [Line Items]    
Common stock, rights to vote 80  
Class A Common Stock [Member]    
Class of Stock [Line Items]    
Common stock, rights to vote one