Quarterly report pursuant to Section 13 or 15(d)

Equity Transactions - Additional Information (Detail)

v2.4.0.6
Equity Transactions - Additional Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Mar. 31, 2013
Dec. 28, 2012
Sep. 28, 2012
Jun. 29, 2012
Mar. 30, 2012
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]                
Stock based compensation expenses             $ 0.8 $ 0.3
Class A and Class B common stock, dividend declared per share $ 0.05         $ 0.035 $ 0.05  
Class A and Class B common stock, dividend paid           3.4 1.2  
Class A and Class B common stock, dividend paid per share $ 0.05 $ 0.035 $ 0.035 $ 0.035 $ 0.035      
Class A and Class B common stock, expected annual dividend payment $ 4.9           $ 4.9  
Class A and Class B common stock, dividend declared date Mar. 18, 2013         Mar. 07, 2012 Mar. 18, 2013