Components of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)			$ 49,410
Successor [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 21,329		49,410
Less: Preferred stock dividends	0		0
Net loss attributable to common shareholders, Diluted	$ 21,329		$ 49,410
Weighted-average shares – basic	14,992		14,992
Effect of dilutive securities	58		105
Weighted-average shares – diluted	15,050		15,097
Predecessor [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)		$ (67,266)		$ (100,739)
Less: Preferred stock dividends		(2,820)		(5,972)
Net loss attributable to common shareholders, Diluted		$ (70,086)		$ (106,711)
Weighted-average shares – basic		89,051		87,496
Effect of dilutive securities		0		0
Weighted-average shares – diluted		89,051		87,496
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share				26,600
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%