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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Feb. 13, 2017	Feb. 12, 2017
Stockholders Equity [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 1.25	$ 1.05
Shares of non-vested restricted stock granted	91,609	100,399
Stock options exercised, shares	35,083	13,750
Stock options exercised, proceeds	$ 2,612	$ 1,102
Common stock issued under employee stock purchase plan, shares	2,047	1,953
Common stock issued under employee stock purchase plan, net proceeds	$ 346	$ 285
Stock Options | Common Stock
Stockholders Equity [Line Items]
Shares withheld to cover cost for stock option exercises related to share based compensation, shares	5,041
Shares withheld to cover cost for stock option exercises related to share based compensation, market value	$ 914
Carrier Enterprise I
Stockholders Equity [Line Items]
Controlling interest, ownership percentage	80.00%
Carrier Enterprise II
Stockholders Equity [Line Items]
Controlling interest, ownership percentage	80.00%		80.00%	70.00%
Carrier Enterprise III
Stockholders Equity [Line Items]
Controlling interest, ownership percentage	60.00%
401(k) Plan
Stockholders Equity [Line Items]
Common stock contribution to 401(k) Plan, shares	17,318	16,389
Common stock contribution to 401(k) plan	$ 2,945	$ 2,428

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

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