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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Feb. 13, 2017	Feb. 12, 2017
Stockholders Equity [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 1.45	$ 1.25	$ 4.15	$ 3.35
Shares of non-vested restricted stock granted	10,000	9,000	110,109	164,899
Shares withheld as payment for tax withholdings related to share based compensation, market value			$ 3,782	$ 4,674
Stock options exercised, shares	8,600	9,084	53,184	25,084
Stock options exercised, proceeds	$ 856	$ 801	$ 4,837	$ 2,111
Common stock issued under employee stock purchase plan, shares	2,235	2,718	6,716	6,977
Common stock issued under employee stock purchase plan, net proceeds	$ 382	$ 402	$ 1,142	$ 1,004
Stock Options | Common Stock
Stockholders Equity [Line Items]
Shares withheld to cover cost for stock option exercises related to share based compensation, shares	376	350	7,027	350
Shares withheld to cover cost for stock option exercises related to share based compensation, market value	$ 69	$ 53	$ 1,269	$ 53
Non-Vested Restricted Stock | Common Stock
Stockholders Equity [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares	8,830	12,354	21,754	32,454
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 1,562	$ 1,893	$ 3,775	$ 4,664
Carrier Enterprise I
Stockholders Equity [Line Items]
Controlling interest, ownership percentage	80.00%		80.00%
Carrier Enterprise II
Stockholders Equity [Line Items]
Controlling interest, ownership percentage	80.00%		80.00%		80.00%	70.00%
Carrier Enterprise III
Stockholders Equity [Line Items]
Controlling interest, ownership percentage	60.00%		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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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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