Quarterly report pursuant to sections 13 or 15(d)

Stockholders' Equity - Summary of Authorized and Outstanding Equity (Parenthetical) (Detail)

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Stockholders' Equity - Summary of Authorized and Outstanding Equity (Parenthetical) (Detail) (USD $)
 3 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2012
Mar. 31, 2014
Class A Common Stock
Dec. 31, 2013
Class A Common Stock
Jul. 12, 2013
Class A Common Stock
Dec. 31, 2012
Class A Common Stock
Mar. 31, 2014
Class B Common Stock
Feb. 28, 2014
Class B Common Stock
Dec. 31, 2013
Class B Common Stock
Dec. 31, 2012
Class B Common Stock
Schedule Of Stockholders Equity [Line Items]                    
Common stock, par value     $ 0.01       $ 0.01 $ 14.50    
Preferred stock, par value $ 0.01                  
Common stock voting rights     1 vote per share       1 vote per share      
Common stockholders rights percentage     100.00%              
Class of share exchangeable to another class             One share of Class A common stock      
Common stock, shares outstanding      7,522,974 7,522,974 5,509,297    4,710,045   4,464,617   
Deferred equity units exercisable             52,188