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Shareholders Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 0.85	$ 0.70	$ 1.70	$ 1.40
Shares of non-vested restricted stock granted	24,500	19,000	112,178	171,979
Common stock issued under employee stock purchase plan, shares	2,203	2,300	4,831	4,969
Common stock issued under employee stock purchase plan, net proceeds	$ 287	$ 275	$ 584	$ 553
Carrier Enterprise I
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage			80.00%
Non-controlling interest, ownership percentage	20.00%		20.00%
Carrier Enterprise II
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage			60.00%
Non-controlling interest, ownership percentage	40.00%		40.00%
Carrier Enterprise III
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage			60.00%
Non-controlling interest, ownership percentage	40.00%		40.00%
Common Stock
Stockholders Equity Note [Line Items]
Stock options exercised, proceeds	$ 454	$ 1,579	$ 2,258	$ 2,682
Common Stock | Class B Common Stock
Stockholders Equity Note [Line Items]
Stock options exercised, shares	7,500	41,000	34,500	66,200
Non-Vested Restricted Stock | Common and Class B Common Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares	20,195		27,477	7,206
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 2,603		$ 3,548	$ 889
Stock Options | Class B Common Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares		10,133		14,760
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 1,288		$ 1,837
401(k) Plan
Stockholders Equity Note [Line Items]
Common stock contribution to 401(k) Plan, shares			20,045	18,343
Common stock contribution to 401(k) plan			$ 2,348	$ 1,963

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

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