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Shareholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Aug. 23, 2017	Jun. 21, 2017
Stockholders Equity Note [Line Items]
Maximum aggregate offering price under sales agreement					$ 250,000,000
Sale of common stock, shares			35,000
Net proceeds from the sale of Common stock			$ 5,391,000
Direct stock issuance costs			285,000
Amount available for sale under sales agreement	$ 244,560,000		244,560,000
Compensation paid to the Agent			$ 49,000
Cash dividends paid per share of Common and Class B common stock	$ 1.25	$ 0.85	$ 3.35	$ 2.55
Shares of non-vested restricted stock granted	9,000	23,803	164,899	135,981
Common stock issued under employee stock purchase plan, shares	2,718	2,084	6,977	6,915
Common stock issued under employee stock purchase plan, net proceeds	$ 402,000	$ 286,000	$ 1,004,000	$ 870,000
Common Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares	350	348	350	348
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 53,000	$ 51,000	$ 53,000	$ 51,000
Stock options exercised, shares	9,084	23,584	25,084	58,084
Stock options exercised, proceeds	$ 801,000	$ 1,834,000	$ 2,111,000	$ 4,092,000
Carrier Enterprise I
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage	80.00%		80.00%			80.00%
Non-controlling interest, ownership percentage	20.00%		20.00%			20.00%
Carrier Enterprise II
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage	80.00%		80.00%
Non-controlling interest, ownership percentage	20.00%		20.00%
Carrier Enterprise III
Stockholders Equity Note [Line Items]
Controlling interest, ownership percentage	60.00%		60.00%
Non-controlling interest, ownership percentage	40.00%		40.00%
Non-Vested Restricted Stock | Common Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares	12,354	2,936	32,454
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 1,893,000	$ 419,000	$ 4,664,000
Non-Vested Restricted Stock | Common Stock And Class B Common Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, shares				30,413
Shares withheld as payment for tax withholdings related to share based compensation, market value				$ 3,967,000
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			$ 2,428,000	$ 2,348,000

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

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Maximum Aggregate Offering Price Under Sales Agreement

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