Quarterly report pursuant to sections 13 or 15(d)

Stockholders' Equity - Class B Common Stock (Detail)

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Stockholders' Equity - Class B Common Stock (Detail)
1 Months Ended 3 Months Ended
Feb. 28, 2014
Mar. 31, 2014
Dec. 31, 2012
Class Of Stock [Line Items]      
Balance, Shares       
Balance, Shares       
Class B Common Stock
     
Class Of Stock [Line Items]      
Balance, Shares   4,464,617   
Common stock repurchased and cancelled (16,530) (16,530)  
Common stock issued upon vesting of deferred equity units 261,958 261,958  
Balance, Shares   4,710,045   
Stock repurchased and cancelled , transaction date   Feb. 01, 2014  
Stock issued upon vesting of deferred equity units, transaction date   Feb. 01, 2014