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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
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Jul. 01, 2014
Carrier Enterprise I
Jun. 30, 2014
Carrier Enterprise I
Sep. 30, 2014
Carrier Enterprise II
Sep. 30, 2014
Carrier Enterprise III
Sep. 30, 2014
Common Stock
Sep. 30, 2013
Common Stock
Sep. 30, 2014
Common Stock
Sep. 30, 2013
Common Stock
Sep. 30, 2014
Common Stock
Non-Vested (Restricted) Stock
Sep. 30, 2014
Class B Common Stock
Sep. 30, 2013
Class B Common Stock
Sep. 30, 2014
Class B Common Stock
Sep. 30, 2013
Class B Common Stock
Sep. 30, 2014
401(k) Plan
Sep. 30, 2013
401(k) Plan
Stockholders Equity Note [Line Items]                                      
Cash dividends paid per share of Common and Class B common stock $ 0.60 $ 0.25 $ 1.40 $ 0.75                              
Shares of non-vested restricted stock granted 10,700 31,500 213,725 119,043                              
Shares withheld as payment for tax withholding related to share based compensation, shares                         21,028 5,454 5,448 5,454 5,448    
Shares withheld as payment for tax withholding related to share based compensation, market value                         $ 2,125 $ 490 $ 490 $ 490 $ 490    
Stock options exercised, shares                 17,850 34,700 41,350 44,200              
Stock options exercised, value                 613 1,162 1,942 1,539              
Common stock issued under employee stock purchase plan, shares 2,741 1,944 6,984 5,870                              
Common stock issued under employee stock purchase plan, net proceeds 259 160 662 459                              
Non-cash contribution to 401(k) plan, shares                                   18,309 22,551
Non-cash contribution to 401(k) plan                                   $ 1,759 $ 1,689
Controlling interest, ownership percentage         80.00% 70.00% 60.00% 60.00%                      
Noncontrolling interest, ownership percentage             40.00% 40.00%