Quarterly Results (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended							5 Months Ended	6 Months Ended	7 Months Ended	12 Months Ended
	Jun. 30, 2018	Jun. 03, 2018	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 03, 2018	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Predecessor Company
Net revenue		$ 190,245			$ 263,679	$ 293,861	$ 287,240	$ 290,531	$ 264,030	$ 453,924	$ 453,924		$ 1,135,662	$ 1,141,400
Operating income (loss)		28,435			25,144	(321,225)	42,931	47,326	20,522	53,579			(210,446)	(408,789)
(Loss) income before income taxes		524,416			(5,119)	(376,307)	6,531	12,906	(13,421)	519,297			(370,291)	(536,874)
Net (loss) income		$ 701,157			$ (5,001)	$ (206,116)	$ 1,274	$ 5,672	$ (7,395)	$ 696,156			$ (206,565)	$ (510,720)
Basic:
(Loss) income per share (in USD per share)		$ 23.90			$ (0.17)	$ (7.03)	$ 0.04	$ 0.19	$ (0.25)
Diluted:
(Loss) income per share (in USD per share)		$ 23.90			$ (0.17)	$ (7.03)	$ 0.04	$ 0.19	$ (0.25)
Successor Company
Net revenue	$ 95,004		$ 309,178	$ 282,254								$ 686,436
Operating income (loss)	13,738		45,562	43,355								102,649
(Loss) income before income taxes	7,586		23,695	17,791								49,072
Net (loss) income	$ 4,980		$ 43,732	$ 12,713								$ 61,425
Basic:
(Loss) income per share (in USD per share)	$ 0.25		$ 2.19	$ 0.64
Diluted:
(Loss) income per share (in USD per share)	$ 0.25		$ 2.18	$ 0.63