Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 15, 2016	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 0		$ 875	$ 168
Charged to Expense	168		286	1,420
Deductions	0		(105)	(713)
Balance at End of Period	168	$ 0	$ 1,056	$ 875
Predecessor [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3,043	20,915
Charged to Expense		2,532
Deductions		(20,404)
Balance at End of Period		$ 3,043