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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | 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, 2016 | Dec. 31, 2018 | Mar. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss available to common shareholders |  |  | $ (15,693) | $ (90,509) | $ (30,896) | $ (10,940) | $ (39,172) | $ (23,573) |  |  |  | $ (39,266) |  |  | $ (171,517) |  |  |
Weighted average outstanding shares of common stock, basic | [1] |  |  |  |  |  |  |  |  |  |  | 21,539,143 |  |  | 26,589,883 |  |  |
Weighted average common stock and equivalents |  |  |  |  |  |  |  |  |  |  |  | 21,539,143 |  |  | 26,589,883 |  |  |
Loss per share, basic |  |  | $ (0.81) | $ (2.83) | $ (1.16) | $ (0.44) | $ (1.67) | $ (1.02) |  |  |  | $ (1.82) | [2] |  | $ (6.45) | [2] |  |
Loss per share, diluted |  |  | $ (0.81) | $ (2.83) | $ (1.16) | $ (0.44) | $ (1.67) | $ (1.02) |  |  |  | $ (1.82) | [3] |  | $ (6.45) | [3] |  |
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 | [4] |  |  |  |  |  |  |  |  |  |  | 7,869,553 |  |  | 5,282,574 |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule Of Earnings Per Share Basic And Diluted [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss available to common shareholders |  | $ (1,122,475) |  |  |  |  |  |  | $ (524,434) | $ (1,646,909) |  |  |  | $ (565,263) |  |  | $ (660,118) |
Weighted average outstanding shares of common stock, basic |  |  |  |  |  |  |  |  |  | 47,121,330 | [1] |  |  | 47,067,887 |  |  | 47,071,066 | [1]
Weighted average common stock and equivalents |  |  |  |  |  |  |  |  |  | 47,121,330 |  |  |  | 47,067,887 |  |  | 47,071,066 |
Loss per share, basic |  | $ (23.82) |  |  |  |  |  |  | $ (11.13) | $ (34.95) | [2] |  |  | $ (12.01) |  |  | $ (14.02) | [2]
Loss per share, diluted |  | $ (23.82) |  |  |  |  |  |  | $ (11.13) | $ (34.95) | [3] |  |  | $ (12.01) |  |  | $ (14.02) | [3]
Predecessor | 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 | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,233 |
[1] | Basic weighted average shares outstanding included 2,547 and 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2018 (Successor) and December 31, 2017 (Successor).
[2] | We calculate “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.
[3] | We calculate “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.
[4] | For the twelve months ended December 31, 2018 and period from August 1, 2017 through December 31, 2017, we also had 5,923,399 and 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the periods, respectively.

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