Annual report pursuant to Section 13 and 15(d)

Accounts Receivable and Major Customers - Additional Information (Detail)

v3.10.0.1
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