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Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss available to common shareholders |  | $ (1,122,475) | $ (15,693) | $ (59,853) | $ (44,200) | $ (15,959) | $ (21,731) | $ (90,509) | $ (30,896) | $ (10,940) | $ (39,172) | $ (23,573) | $ (524,434) | $ (1,646,909) | $ (39,266) | $ (141,743) | $ (171,517)
Weighted average outstanding shares of common stock, basic | [1] |  |  |  |  |  |  |  |  |  |  |  |  | 47,121,330 | 21,539,143 | 38,204,934 | 26,589,883
Weighted average common stock and equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,121,330 | 21,539,143 | 38,204,934 | 26,589,883
Loss per share, basic |  | $ (23.82) | $ (0.81) | $ (1.52) | $ (1.15) | $ (0.42) | $ (0.58) | $ (2.83) | $ (1.16) | $ (0.44) | $ (1.67) | $ (1.02) | $ (11.13) | $ (34.95) | $ (1.82) | $ (3.71) | $ (6.45)
Loss per share, diluted |  | $ (23.82) | $ (0.81) | $ (1.52) | $ (1.15) | $ (0.42) | $ (0.58) | $ (2.83) | $ (1.16) | $ (0.44) | $ (1.67) | $ (1.02) | $ (11.13) | $ (34.95) | $ (1.82) | $ (3.71) | $ (6.45)
In-the-money Options, Warrants and Restricted Stock Awards and Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental "in-the-money" options, warrants, and restricted stock awards and units outstanding at the end of the period | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,869,553 | 2,483,956 | 5,282,574
[1] | Basic weighted average shares outstanding included 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2017 (Successor).
[2] | For both years ended December 31, 2019 and 2018 and the period from August 1, 2017 through December 31, 2017, we also had 5,923,399, 5,923,399 and 5,062,089, respectively, shares of “out-of- the-money” warrants outstanding at the end of both periods.

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