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Components of Basic and Diluted Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net loss available to common shareholders $ (10,940)   $ (50,112)  
Weighted average outstanding shares of common stock, basic [1] 24,654,220   23,989,254  
Weighted average shares of common stock and equivalents 24,654,220   23,989,254  
Loss per share, basic [2] $ (0.44)   $ (2.09)  
Loss per share, diluted [3] $ (0.44)   $ (2.09)  
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] 4,521,727   5,454,218  
Predecessor        
Schedule Of Earnings Per Share Basic And Diluted [Line Items]        
Net loss available to common shareholders   $ (524,434)   $ (619,289)
Weighted average outstanding shares of common stock, basic [1]   47,121,304   47,101,155
Weighted average shares of common stock and equivalents   47,121,304   47,101,155
Loss per share, basic [2]   $ (11.13)   $ (13.15)
Loss per share, diluted [3]   $ (11.13)   $ (13.15)
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 June 30, 2018, were 26,085,274, 3,924,441 and 30,009,715, 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 six months ended June 30, 2018, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.