Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Class of Stock [Line Items]      
Preferred Stock, shares authorized 10,000,000 10,000,000  
Preferred Stock, par value $ 0.001 $ 0.001  
Voting rights Class A Common Stock entitled to one vote per share while holders of Class B Common Stock are entitled to ten votes per share on all matters submitted to a vote of stockholders.    
Certain Class B stockholders converted into Class A 404,396 22,880 13,640
CLASS A COMMON STOCK [Member]
      
Class of Stock [Line Items]      
Common Stock, shares authorized 100,000,000 100,000,000  
Common Stock, par value $ 0.001 $ 0.001  
CLASS B COMMON STOCK [Member]
      
Class of Stock [Line Items]      
Common Stock, shares authorized 60,000,000 60,000,000  
Common Stock, par value $ 0.001 $ 0.001