Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

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Equity Transactions - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 28, 2012
Aug. 30, 2012
Jun. 29, 2012
May 31, 2012
Mar. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Class of Stock [Line Items]                  
Non-cash stock-based compensation           $ 299,000 $ 165,000 $ 995,000 $ 646,000
Class A and Class B common stock, dividend declared per share   $ 0.035   $ 0.035 $ 0.035        
Class A and Class B common stock, dividend declared date         Mar. 07, 2012        
Class A and Class B common stock, dividend paid 900,000   900,000   900,000     2,558,000  
Class A and Class B common stock, dividend paid per share $ 0.035   $ 0.035   $ 0.035 $ 0.13   $ 0.10  
Class A and Class B common stock, dividend payment period         We anticipate paying quarterly common stock dividends in March, June, September and December of each year.        
Class A and Class B common stock, expected annual dividend payment           $ 3,400,000   $ 3,400,000