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 6 Months Ended
Jun. 29, 2012
Jun. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Class of Stock [Line Items]              
Stock based compensation expense     $ 400,000   $ 200,000 $ 700,000 $ 500,000
Class A and Class B common stock, dividend declared per share       $ 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   1,704,000  
Class A and Class B common stock, dividend paid per share   $ 0.035 $ 0.04 $ 0.035   $ 0.07  
Class A and Class B common stock, dividend payment period       We anticipate paying quarterly dividends in March, June, September and December of each year.      
Class A and Class B common stock, expected annual dividend payment       $ 3,400,000