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Components of Basic and Diluted Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net loss available to common shareholders $ (39,172)  
Weighted average outstanding shares of common stock, basic [1] 23,424,943  
Weighted average shares of common stock and equivalents 23,424,943  
Loss per share, basic [1] $ (1.67)  
Loss per share, diluted [2] $ (1.67)  
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 [3] 6,255,686  
Predecessor    
Schedule Of Earnings Per Share Basic And Diluted [Line Items]    
Net loss available to common shareholders   $ (94,855)
Weighted average outstanding shares of common stock, basic [1]   47,080,783
Weighted average shares of common stock and equivalents   47,080,783
Loss per share, basic [1]   $ (2.01)
Loss per share, diluted [2]   $ (2.01)
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 [3]   1,233
[1] Basic weighted average shares outstanding includes 108,044 shares issuable upon the exercise of New Creditor Warrants held by U.S. citizens at March 31, 2018 (Successor). Common shares and new creditor warrants and the sum of common shares and New Creditor Warrants outstanding at March 31, 2018 were 23,988,075, 6,021,696 and 30,009,771, 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] For the three months ended March 31, 2018, the company also had 5,062,089 shares of “out-of- the-money” warrants outstanding at the end of the period.