Reorganization Items, net (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reorganizations [Abstract]
Deferred financing costs and term loan discount	$ 25,900	$ 25,921
Professional fees		5,682
Reorganization items, net		31,603	$ 0	$ 0
Accrued professional fees	$ 4,000	$ 4,000