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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 7 Months Ended 9 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2018
Jul. 31, 2017
Sep. 30, 2018
Schedule Of Earnings Per Share Basic And Diluted [Line Items]          
Net loss available to common shareholders   $ (15,693) $ (30,896)   $ (81,008)
Weighted average outstanding shares of common stock, basic [1]   19,389,031 26,614,507   25,073,284
Weighted average shares of common stock and equivalents   19,389,031 26,614,507   25,073,284
Loss per share, basic [2]   $ (0.81) $ (1.16)   $ (3.23)
Loss per share, diluted [3]   $ (0.81) $ (1.16)   $ (3.23)
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 at the end of the period [4]   15,513,573 3,476,437   5,143,206
Predecessor          
Schedule Of Earnings Per Share Basic And Diluted [Line Items]          
Net loss available to common shareholders $ (1,122,475)     $ (1,741,763)  
Weighted average outstanding shares of common stock, basic [1] 47,121,407     47,104,117  
Weighted average shares of common stock and equivalents 47,121,407     47,104,117  
Loss per share, basic [2] $ (23.82)     $ (36.98)  
Loss per share, diluted [3] $ (23.82)     $ (36.98)  
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 at the end of the period [4] 183     183  
[1] Common shares and New Creditor Warrants and the sum of common shares and New Creditor Warrants outstanding at September 30, 2018, were 26,815,991, 3,512,416 and 30,328,407, respectively.
[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 common stock and equivalents”.
[4] For the nine months ended September 30, 2018, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.