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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, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Jul. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]                        
Net loss available to common shareholders   $ (15,693) $ (23,573)             $ (39,266)    
Weighted average outstanding shares of common stock, basic [1]                   21,539,143    
Weighted average common stock and equivalents                   21,539,143    
Loss per share, basic   $ (0.81) $ (1.02)             $ (1.82) [2]    
Loss per share, diluted   $ (0.81) $ (1.02)             $ (1.82) [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    
Predecessor                        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]                        
Net loss available to common shareholders $ (1,122,475)     $ (524,434) $ (94,855) $ (297,676) $ (178,490) $ (89,097) $ (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) $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (34.95) [2]   $ (12.01) $ (14.02) [2]
Loss per share, diluted $ (23.82)     $ (11.13) $ (2.01) $ (6.32) $ (3.79) $ (1.89) $ (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 includes 924,125 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at December 31, 2017 (Successor).
[2] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding share of common stock, basic”.
[3] The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average common stock and equivalents”.
[4] For the period from August 1, 2017 through December 31, 2017, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.