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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 16, 1999 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 16, 2020 | May 01, 2018
Class of Stock [Line Items] |  |  |  |  |  |
Liquidation value of outstanding preferred stock |  | $ 3,649 |  |  |  |
Preferred stock voting right |  | Series AA preferred stock is entitled to one vote per share. |  |  |  |
Class B common stock voting rights |  | holders of Class B common stock have ten votes per share on all matters in which the holders of common stock are entitled to vote and holders of Class A common stock have one vote per share on such matters. |  |  |  |
Shares issued |  |  | 266,410 | 576,002 |  |
Shelf Registration [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares issued |  | 0 | 0 |  |  |
Series AA Preferred Stock [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized | 5,720 | 5,720 | 5,720 |  |  |
Preferred stock, par value | $ 0.001 | $ 0.001 | $ 0.001 |  |  |
Dividends paid to preferred stock | 15.95 |  |  |  |  |
Amount entitled | $ 638 |  |  |  |  |
Preferred Class A [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Preferred stock, shares authorized | 1,000,000 |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, par value |  | $ 0.001 | $ 0.001 |  |  | $ 0.001
Issuance of shares related to acquisition |  |  |  | 163,137 |  |
Common Class A [Member] | Stock Repurchase Program [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 250,000 |
Stock repurchase program expiry date |  | Sep. 30, 2021 |  |  |  |
Stock repurchased during period |  | $ 0 |  |  |  |
Common Class A [Member] | Equity Distribution Agreement [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares sold |  | 842,412 |  |  |  |
Common stock, shares available to be sold |  | $ 336,668 |  |  |  |
Common Class A [Member] | Maximum [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Aggregate offering price of common stock issuable |  |  |  |  |  | $ 400,000

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