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Restricted Stock, Stock Options and Other Stock Plans - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 14, 2004 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average remaining contractual term of unexercised stock options |  | 7 years 8 months 12 days | 8 years 6 months |
Class A [Member] | November 2014 New Share Repurchase Program [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Remaining common stock available for repurchase under share repurchase program |  | 404,000 | 404,000 |
2004 Long-Term Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation cost related to stock issuances |  | $ 0.3 | $ 0.6 |
2004 Long-Term Compensation Plan [Member] | Class A [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Authorized increase in number of shares |  | 1,000,000 |  |
Description of additional shares authorized for issuance under long-term compensation plan |  | The Plan authorized 1.0 million shares of our Class A Common Stock with an automatic annual increase on January 1 of each successive year of the lesser of (i) 3% of the Class A common stock outstanding or (ii) 107 shares. |  |
Percentage of additional shares authorized issuable under long-term compensation plan |  | 3.00% |  |
Shares issued |  | 107 |  |
Shares available for issuance under long-term compensation plan |  | 60,000 | 400,000 |
Stock Options [Member] | 2004 Long-Term Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term compensation plan stock option expiration period | 10 years |  |  |
Weighted-average remaining contractual term of unexercised stock options |  | 7 years 8 months 1 day | 8 years 6 months |
Minimum [Member] | 2004 Long-Term Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term compensation plan vesting period | 1 year |  |  |
Maximum [Member] | Class A [Member] | November 2014 New Share Repurchase Program [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
New share repurchase program, shares authorized to repurchase |  |  |  | 429,000
Maximum [Member] | 2004 Long-Term Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long-term compensation plan vesting period | 5 years |  |  |

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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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