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Stockholders' Equity - Summary of Stockholders' Equity (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class A Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, shares outstanding, beginning balance | 2,426,107 | 2,419,107 |
Share conversion | 10,000,000 |  |
Issued | 9,450 | 7,000 | 8,000
Common stock, shares outstanding, ending balance | 12,435,557 | 2,426,107 | 2,419,107
Class B Common Stock |  |  |
Class Of Stock [Line Items] |  |  |
Common stock, shares outstanding, beginning balance | 10,000,000 | 10,000,000 |
Share conversion | (10,000,000) |  |
Common stock, shares outstanding, ending balance |  | 10,000,000 | 10,000,000

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