Income Taxes - Components of Income Tax Expense (Detail) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 15, 2016	Dec. 31, 2017	Dec. 31, 2015
Current income tax (expense) benefit:
Current income tax (expense) benefit, total	$ 0	$ (2,042)	$ 1,667	$ 3,522
Deferred income tax (expense) benefit:
Deferred income tax (expense) benefit, total	0	(787)	35	189,327
Total income tax (expense) benefit	$ 0	$ (2,829)	$ 1,702	$ 192,849