Annual report pursuant to section 13 and 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 $)
 12 Months Ended
Dec. 31, 2013
Jul. 12, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Stockholders Equity [Line Items]          
Preferred stock, par value $ 0.01        
Common Stock, shares outstanding             
Class A Common Stock
          
Schedule Of Stockholders Equity [Line Items]          
Common stock, par value $ 0.01        
Common stock voting rights 1 vote per share        
Common stockholders rights percentage 100.00%        
Common Stock, shares outstanding 7,522,974 5,509,297         
Class B Common Stock
          
Schedule Of Stockholders Equity [Line Items]          
Common stock, par value $ 0.01        
Common stock voting rights 1 vote per share        
Class of share exchangeable to another class One share of Class A common stock        
Common Stock, shares outstanding 4,464,617           
Deferred equity units exercisable 175,298