Shareholders Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended					6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Carrier Enterprise I	Jul. 02, 2012 Carrier Enterprise I	Jul. 01, 2009 Carrier Enterprise I	Jun. 30, 2013 401(K) Plan	Jun. 30, 2012 401(K) Plan	Jun. 30, 2013 Employee Stock Purchase Plan	Jun. 30, 2012 Employee Stock Purchase Plan	Jun. 30, 2013 Employee Stock Purchase Plan	Jun. 30, 2012 Employee Stock Purchase Plan	Jun. 30, 2013 Common Stock	Jun. 30, 2012 Common Stock	Jun. 30, 2013 Common Stock	Jun. 30, 2012 Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 0.25	$ 0.62	$ 0.50	$ 1.24
Shares of non-vested restricted stock granted			85,543	58,301
Stock options exercised, shares														2,500	69,334	9,500	90,834
Stock options exercised, value														$ 39	$ 1,822	$ 377	$ 2,809
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
Common stock issued under employee stock purchase plan, shares										1,744	2,632	3,926	5,594
Common stock issued under employee stock purchase plan, net proceeds										140	186	299	380
Common stock issued to profit sharing retirement plan, shares								22,551	26,991
Non-cash contribution for 401(k) plan								$ 1,689	$ 1,772
Controlling interest, ownership percentage	60.00%		60.00%		60.00%	70.00%	60.00%
Noncontrolling interest, ownership percentage	40.00%		40.00%				40.00%