Accounts Receivable and Major Customers - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2017 USD ($) Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	$ 59,030	$ 39,106
Successor [Member] | Sales Revenue | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | Customer	3	3
Revenues, major customers	$ 304,300	$ 137,500
Concentration risk, percentage	69.00%	86.00%
Successor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ 173,000	$ 94,100
Concentration risk, percentage	39.00%	59.00%
Successor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ 71,500	$ 22,100
Concentration risk, percentage	16.00%	14.00%
Successor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ 59,800	$ 21,300
Concentration risk, percentage	14.00%	13.00%
Successor [Member] | Accounts Receivable | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	48.00%	82.00%
Accounts receivable, major customers	$ 28,600	$ 32,100