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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 07, 2018 | May 31, 2020 | Dec. 31, 2018 | Aug. 13, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 16, 2019
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Common stock warrants exercised (in shares) |  |  |  |  |  |  | 402,708 |
Remaining warrants expired without being exercised (in shares) | 11,955 |  |  |  |  |  |  |
Authorized capital stock (in shares) |  |  |  |  |  |  |  | 405,000,000
Common stock, shares authorized (in shares) |  |  |  |  | 400,000,000 | 400,000,000 |  | 400,000,000
Common stock, par value (in dollars per share) |  |  |  |  | $ 0.50 | $ 0.50 |  | $ 0.50
Preferred stock, authorized capital stock (in shares) |  |  |  |  | 5,000,000 | 5,000,000 |  | 5,000,000
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  | $ 10.00
Issuance of common stock |  |  | $ 0 | $ 0 | $ 206,626 | $ 300,000 |  |
Over-Allotment Option |  |  |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  | 41,325,000 |  |  |  |  |  |
Issuance of common stock |  | $ 196,500 |  |  |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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