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Shareholders Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Carrier Enterprise I
Jul. 02, 2012
Carrier Enterprise I
Jul. 01, 2009
Carrier Enterprise I
Mar. 31, 2013
401(K) Plan
Mar. 31, 2012
401(K) Plan
Mar. 31, 2013
Employee Stock Purchase Plan
Mar. 31, 2012
Employee Stock Purchase Plan
Mar. 31, 2013
Common Stock
Mar. 31, 2012
Common Stock
Stockholders Equity Note [Line Items]                      
Cash dividends paid per share of Common and Class B common stock $ 0.25 $ 0.62                  
Shares of non-vested restricted stock granted 90,543 58,301                  
Stock options exercised, shares                   7,000 21,500
Stock options exercised, value                   $ 338 $ 987
Common stock issued under employee stock purchase plan, shares               2,182 2,962    
Common stock issued under employee stock purchase plan, net proceeds               159 194    
Common stock issued to profit sharing retirement plan, shares           22,551 26,991        
Non-cash contribution for 401(k) plan $ 1,689 $ 1,772       $ 1,689 $ 1,772        
Controlling interest, ownership percentage 60.00%   60.00% 70.00% 60.00%            
Noncontrolling interest, ownership percentage 40.00%       40.00%