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Shareholders Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
401(K) Plan
Sep. 30, 2011
401(K) Plan
Jul. 02, 2012
Carrier Enterprise I
Jun. 30, 2012
Carrier Enterprise I
Jul. 01, 2009
Carrier Enterprise I
Sep. 30, 2012
Employee Stock Purchase Plan
Sep. 30, 2011
Employee Stock Purchase Plan
Sep. 30, 2012
Employee Stock Purchase Plan
Sep. 30, 2011
Employee Stock Purchase Plan
Sep. 30, 2011
Non-Vested (Restricted) Stock
Sep. 30, 2012
Common Stock
Sep. 30, 2011
Common Stock
Sep. 30, 2012
Common Stock
Sep. 30, 2011
Common Stock
Sep. 30, 2012
Stock Options
Sep. 30, 2012
Stock Options
Stockholders Equity Note [Line Items]                                        
Cash dividends paid per share of Common and Class B common stock $ 0.62 $ 0.57 $ 1.86 $ 1.66                                
Shares of non-vested restricted stock granted 53,000 15,000 111,301 429,602                                
Stock delivered as payment to satisfy tax withholdings, shares                           2,527         3,592 23,159
Stock delivered as payment to satisfy tax withholdings, market value                           $ 180         $ 276 $ 1,725
Stock options exercised, shares                             18,250 3,450 109,084 75,750    
Stock options exercised, value                             571 80 3,380 2,715    
Common stock issued under employee stock purchase plan, shares                   3,126 2,739 8,720 10,131              
Common stock issued under employee stock purchase plan, net proceeds                   217 168 597 641              
Common stock issued to profit sharing retirement plan, shares         26,991 27,240                            
Non-cash contribution for 401(k) plan     $ 1,772 $ 1,718 $ 1,772 $ 1,718                            
Controlling interest, ownership percentage 60.00%   60.00%       70.00% 60.00% 60.00%                      
Noncontrolling interest, ownership percentage 40.00%   40.00%           40.00%