Components of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ 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, 2017		Sep. 12, 2016		Sep. 30, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)							$ 43,463
Successor [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			55,000
Net income (loss)	$ (3,441)		$ (5,947)				43,463
Net loss attributable to common shareholders, Diluted	$ (3,441)		$ (5,947)				$ 43,463
Weighted-average shares – basic	14,992,000		14,994,000				14,993,000
Effect of dilutive securities	0		0	[1]			69,000	[2]
Weighted-average shares – diluted	14,992,000		14,994,000				15,062,000
Preferred Stock Dividends and Other Adjustments	$ 0		$ 0				$ 0
Net Income (Loss) Available to Common Stockholders, Basic	$ (3,441)		$ (5,947)				$ 43,463
Predecessor [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)		$ 1,155,341			$ 1,054,602
Net loss attributable to common shareholders, Diluted		$ 1,155,341			$ 1,048,630
Weighted-average shares – basic		89,292,000			88,013,000
Effect of dilutive securities		22,166,000			36,074,000
Weighted-average shares – diluted		111,458,000			124,087,000
Preferred Stock Dividends and Other Adjustments		$ 0			$ (5,972)	[3]
Net Income (Loss) Available to Common Stockholders, Basic		$ 1,155,341			$ 1,048,630
Predecessor [Member] | Series A Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Perpetual Preferred Stock, dividend rate (as a percent)					6.00%
Predecessor [Member] | Series B Preferred Stock
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Perpetual Preferred Stock, dividend rate (as a percent)					6.00%

[1] The number of dilutive securities for the three months ended September 30, 2017, which is attributable to RSUs and PRSUs, was determined under the “treasury stock” method. For the three months ended September 30, 2017, approximately 0.1 million of potentially dilutive securities attributable to RSUs had the effect of being anti-dilutive and were excluded from the calculation of diluted loss per common share.

[2] 2 The number of dilutive securities for the three and nine months ended September 30, 2017, which is attributable to RSUs and PRSUs, was determined under the “treasury stock” method.

[3] 1 Dividends attributable to our Series A 6% Convertible Perpetual Preferred Stock and Series B 6% Convertible Perpetual Preferred Stock (together, the “Series A and B Preferred Stock”) were excluded from the computation of diluted loss per share for the period from January 1, 2016 through September 12, 2016, as their assumed conversion would have been anti-dilutive.