Components of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) shares in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 12, 2016	Sep. 30, 2015	Sep. 12, 2016		Sep. 30, 2015
Schedule of Earnings per Share, Basic and Diluted [Line Items]
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	$ 0	$ 0	$ 5,935,000
Net income (loss)	(3,441,000)	1,150,055,000	25,900,000	$ 1,054,602,000		$ (111,394,000)
Less: Preferred stock dividends	0	0	(5,935,000)	(5,972,000)	[1]	(18,069,000)	[1]
Net income (loss) attributable to common shareholders, Basic	(3,441,000)	1,150,055,000	19,965,000	1,048,630,000		(129,463,000)
Net loss attributable to common shareholders, Diluted	$ (3,441,000)	$ 1,150,055,000	$ 25,900,000	$ 1,048,630,000		$ (129,463,000)
Weighted-average shares – basic	14,992	89,292	72,651	88,013		72,438
Effect of dilutive securities	0	22,166	30,801	36,074	[2]	0	[2]
Weighted-average shares – diluted	14,992	111,458	103,452	124,087		72,438
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share						31,100

[1] Preferred stock dividends were excluded from the computation of diluted earnings (loss) per share for the period January 1, 2016 through September 12, 2016 and the nine months ended September 30, 2015, as the assumed conversion of the outstanding preferred stock would have been anti-dilutive.

[2] For the nine months ended September 30, 2015, approximately 31.1 million of potentially dilutive securities, including the Series A Preferred Stock and Series B Preferred Stock, stock options and restricted stock units, had the effect of being anti-dilutive and were excluded from the calculation of diluted earnings (loss) per common share.