Annual report pursuant to Section 13 and 15(d)

Equity Transactions - Additional Information (Detail)

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Equity Transactions - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Director
Dec. 31, 2012
Dec. 31, 2011
Equity [Abstract]      
Common stock vote per share Holders of Class A common stock are entitled to one vote per share and holders of Class B common stock are entitled to ten votes per share, except for specified related party transactions.    
Number of independent directors Number?Of?Independent?Directors 2 2    
Stock based compensation expenses $ 1,849 $ 1,368 $ 950