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Shareholders Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 13, 2017	Mar. 31, 2017	Mar. 31, 2016
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock		$ 1.05	$ 0.85
Shares of non-vested restricted stock granted		100,399	87,678
Common stock issued under employee stock purchase plan, shares		1,953	2,628
Common stock issued under employee stock purchase plan, net proceeds		$ 285	$ 297
Carrier Enterprise I
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage		60.00%
Non-controlling interest, ownership percentage		40.00%
Carrier Enterprise II
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage	80.00%	80.00%
Non-controlling interest, ownership percentage		20.00%
Carrier Enterprise III
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage		80.00%
Non-controlling interest, ownership percentage		20.00%
Common Stock
Stockholders Equity Note [Line Items]
Stock options exercised, shares		13,750	27,000
Stock options exercised, proceeds		$ 1,102	$ 1,804
Non-Vested Restricted Stock | Common Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares			7,282
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 945
401(k) Plan
Stockholders Equity Note [Line Items]
Common stock contribution to 401(k) Plan, shares		16,389	20,045
Common stock contribution to 401(k) plan		$ 2,428	$ 2,348

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- Definition

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

+ References

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Ownership Percentage

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