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Capital Stock - Additional Information (Detail) - $ / shares | Apr. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 30, 2016 | Oct. 01, 2013
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Capital Unit [Line Items] |  |  |  |  |
Common Stock, authorized shares | 500,000,000 | 500,000,000 | 500,000,000 | 150,000,000 | 100,000,000
Common Stock, par value |  | $ 0.01 | $ 0.01 |  | $ 0.01
Preferred Stock, shares authorized | 10,000,000 |  |  |  |
Common Stock, shares issued | 24,150,000 | 148,571,412 | 144,386,618 |  |
Common Stock, shares outstanding |  | 148,571,412 | 144,386,618 |  |
IPO [Member] |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Shares issued, price per share | $ 22.00 |  |  |  |
Private Placement [Member] |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Shares issued, price per share | $ 22.00 |  |  |  |
Shares issued | 4,545,455 |  |  |  |
Junior Convertible Participating Preferred Stock [Member] |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Preferred Stock, shares authorized |  |  |  |  | 70,000,000
Preferred Stock, par value |  |  |  |  | $ 0.01
Senior Convertible Participating Preferred Stock [Member] |  |  |  |  |
Capital Unit [Line Items] |  |  |  |  |
Preferred Stock, shares authorized |  |  |  | 70,000,000 |
Preferred Stock, par value |  |  |  | $ 0.01 |

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