Accounts Receivable and Major Customers - Additional Information (Detail) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) Customer	Mar. 31, 2016 USD ($) Customer	Dec. 31, 2016 USD ($)
Accounts Receivable | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage			81.00%
Accounts receivable, major customers			$ 16.7
Successor [Member] | Sales Revenue | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | Customer	1
Revenues, major customers	$ 31.2
Concentration risk, percentage	90.00%
Successor [Member] | Accounts Receivable | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	86.00%
Accounts receivable, major customers	$ 20.2
Predecessor [Member] | Sales Revenue | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | Customer		2
Revenues, major customers		$ 26.5
Concentration risk, percentage		88.00%
Predecessor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers		$ 13.9
Concentration risk, percentage		46.00%
Predecessor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers		$ 12.6
Concentration risk, percentage		42.00%