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Schedule of Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Reconciliation Of Provision Of Income Taxes [Line Items] |  |  |  |  |  |  |  |
Current, Federal, Income tax expense (benefit) |  |  |  | $ 11 |  |  |  |
Federal, Income tax expense (benefit) |  |  |  | 11 |  |  |  |
Current, State, Income tax expense (benefit) |  |  |  | 0 |  |  |  |
Deferred, State, Income tax expense (benefit) |  |  |  | 0 |  |  |  |
State, Income tax expense (benefit) |  |  |  | 0 |  |  |  |
Current, International, Income tax expense (benefit) |  |  |  | 2,028 |  |  |  |
International, Income tax expense (benefit) |  |  |  | 2,028 |  |  |  |
Current, Total, Income tax expense (benefit) |  |  |  | 2,039 |  |  |  |
Income tax expense (benefit), Total | $ 5,797 |  |  | $ 2,039 | $ 9,118 |  |  |
Predecessor |  |  |  |  |  |  |  |
Reconciliation Of Provision Of Income Taxes [Line Items] |  |  |  |  |  |  |  |
Current, Federal, Income tax expense (benefit) |  |  | $ (822) |  |  |  |  | $ (842)
Deferred, Federal, Income tax expense (benefit) |  |  | (5,543) |  |  |  |  | (2,200)
Federal, Income tax expense (benefit) |  |  | (6,365) |  |  |  |  | (3,042)
Current, State, Income tax expense (benefit) |  |  | 3 |  |  |  |  | 17
Deferred, State, Income tax expense (benefit) |  |  | 0 |  |  |  |  | 0
State, Income tax expense (benefit) |  |  | 3 |  |  |  |  | 17
Current, International, Income tax expense (benefit) |  |  | 5,128 |  |  |  |  | 9,422
International, Income tax expense (benefit) |  |  | 5,128 |  |  |  |  | 9,422
Current, Total, Income tax expense (benefit) |  |  | 4,309 |  |  |  |  | 8,597
Deferred, Total, Income tax expense (benefit) |  |  | (5,543) |  |  | $ (7,743) |  | (2,200)
Income tax expense (benefit), Total |  | $ 295 | $ (1,234) |  |  | $ 2,012 | $ 4,680 | $ 6,397

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