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Shareholders Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stockholders Equity Note [Line Items]        
Cash dividends paid per share of Common and Class B common stock $ 0.62 $ 0.57 $ 1.24 $ 1.09
Shares of non-vested restricted stock granted   22,750 58,301 414,602
Non-cash contribution for 401(k) plan     $ 1,772 $ 1,718
Controlling interest, ownership percentage 60.00%   60.00%  
Noncontrolling interest, ownership percentage 40.00%   40.00%  
401(K) Plan
        
Stockholders Equity Note [Line Items]        
Common stock issued to profit sharing retirement plan, shares     26,991 27,240
Non-cash contribution for 401(k) plan     1,772 1,718
Employee Stock Purchase Plan
        
Stockholders Equity Note [Line Items]        
Common stock issued under employee stock purchase plan, shares 2,632 3,395 5,594 7,392
Common stock issued under employee stock purchase plan, net proceeds 186 232 380 473
Non-Vested (Restricted) Stock
        
Stockholders Equity Note [Line Items]        
Stock delivered as payment to satisfy tax withholdings, shares   2,527   2,527
Stock delivered as payment to satisfy tax withholdings, market value   180   180
Common Stock
        
Stockholders Equity Note [Line Items]        
Stock options exercised, shares 69,334 6,500 90,834 72,300
Stock options exercised, value 1,822 228 2,809 2,635
Stock Options
        
Stockholders Equity Note [Line Items]        
Stock delivered as payment to satisfy tax withholdings, shares 19,567   19,567  
Stock delivered as payment to satisfy tax withholdings, market value $ 1,449   $ 1,449