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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 428
Common and Class B Common Stock | Non-Vested Restricted Stock
Stockholders Equity Note [Line Items]
Shares withheld as payment for tax withholdings related to share based compensation, market value	$ 428
Shares withheld as payment for tax withholdings related to share based compensation, shares	2,985
Common Stock | Stock Option
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 717	$ 2,612
Shares withheld as payment for tax withholdings related to share based compensation, market value		$ 914
Shares withheld as payment for tax withholdings related to share based compensation, shares		5,041
Common Stock | Employee Stock Purchase Plan [Member]
Stockholders Equity Note [Line Items]
Net proceeds from the sale of Common stock	$ 410	$ 346
Common Stock | Class B Common Stock
Stockholders Equity Note [Line Items]
Cash dividends paid per share of Common and Class B common stock	$ 1.60	$ 1.25

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 25
-Paragraph 19A
-URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897

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- Definition

The cash inflow from the issuance of an equity stock that has been previously reacquired by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

+ References

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- Definition

Stockholders Equity Note [Line Items]

+ References

No definition available.

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