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Components of Basic and Diluted Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Jul. 31, 2017
Sep. 30, 2016
Schedule Of Earnings Per Share Basic And Diluted [Line Items]          
Net loss available to common shareholders   $ (15,693)      
Weighted average outstanding shares of common stock, basic [1]   19,389,031      
Weighted average shares of common stock and equivalents   19,389,031      
Loss per share, basic [2]   $ (0.81)      
Loss per share, diluted [3]   $ (0.81)      
Antidilutive incremental options, warrants, and restricted stock awards and units   15,513,573      
Predecessor          
Schedule Of Earnings Per Share Basic And Diluted [Line Items]          
Net loss available to common shareholders $ (1,122,475)   $ (178,490) $ (1,646,909) $ (267,587)
Weighted average outstanding shares of common stock, basic [1] 47,121,407   47,067,864 47,121,330 47,067,790
Weighted average shares of common stock and equivalents 47,121,407   47,067,864 47,121,330 47,067,790
Loss per share, basic [2] $ (23.82)   $ (3.79) $ (34.95) $ (5.69)
Loss per share, diluted [3] $ (23.82)   $ (3.79) $ (34.95) $ (5.69)
Antidilutive incremental options, warrants, and restricted stock awards and units     525,161   508,989
[1] Basic weighted average shares outstanding includes 410,262 shares issuable upon the exercise of Creditor Warrants held by U.S citizens at September 30, 2017 (Successor).
[2] The company calculates “Loss per share, basic” by dividing “Net loss available to common shareholders” by “Weighted average outstanding shares of common stock, basic”.
[3] The company calculates “Loss per share, diluted” by dividing “Net loss available to common shareholders” by “Weighted average shares of common stock and equivalents”.