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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.