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Indebtedness - Additional Information (Detail) - USD ($)	Feb. 02, 2018	Jul. 31, 2017	Jun. 30, 2018	Mar. 07, 2018	Dec. 31, 2017
Debt [Line Items]
Restricted cash			$ 5,213,000		$ 21,300,000
Tendered Notes
Debt [Line Items]
Debt Instrument Face Amount				$ 46,023
Offer | Senior Secured Notes
Debt [Line Items]
Debt instrument fixed interest rate	8.00%
Debt instrument maturity year	2022
Predecessor | Offer
Debt [Line Items]
Debt instrument repurchase period		60 days
Percentage of proceeds from Asset Sales, net of commission paid		65.00%
Minimum | Predecessor | Offer
Debt [Line Items]
Net proceeds realized from asset sales exceed amount		$ 10,000,000
Maximum | Offer | Senior Secured Notes
Debt [Line Items]
Debt Instrument Face Amount	$ 24,700,000

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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