Components of Calculation of Basic and Diluted Earnings Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 28,407
Weighted-average shares – basic		85,941
Effect of dilutive securities		0
Successor [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	28,407
Less: Preferred stock dividends	0
Net income (loss) attributable to common shareholders, Basic	28,407
Net loss attributable to common shareholders, Diluted	$ 28,407
Weighted-average shares – basic	14,992
Effect of dilutive securities	134
Weighted-average shares – diluted	15,126
Predecessor [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)		$ (33,473)
Less: Preferred stock dividends		(3,152)
Net income (loss) attributable to common shareholders, Basic		(36,625)
Net loss attributable to common shareholders, Diluted		$ (36,625)
Weighted-average shares – basic		85,941
Weighted-average shares – diluted		85,941
Potentially dilutive securities with the effect of being anti-dilutive excluded from the calculation of diluted earnings per common share		27,600
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%