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Shareholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stockholders Equity Note [Line Items] |  |  |  |
Shares withheld as payment for tax withholdings related to share based compensation, market value |  |  | $ 983 | $ 2,213
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 | $ 555 | $ 2,213 | $ 983 | $ 2,213
Shares withheld as payment for tax withholdings related to share based compensation, shares | 3,608 | 12,924 | 6,593 | 12,924
Common Stock | Stock Option |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Net proceeds from the sale of Common stock | $ 1,526 | $ 1,369 | $ 2,243 | $ 3,981
Shares withheld as payment for tax withholdings related to share based compensation, market value |  | $ 286 |  | $ 1,200
Shares withheld as payment for tax withholdings related to share based compensation, shares |  | 1,610 |  | 6,651
Common Stock | Employee Stock Purchase Plan [Member] |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |
Net proceeds from shares purchased under ESPP | $ 423 | $ 414 | $ 833 | $ 760
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 | $ 1.45 | $ 3.20 | $ 2.70

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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 -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=107668666&loc=SL79513924-113897 + Details
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