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Schedule of Tax Rate Applicable to Pre-Tax Earning, U.S. Federal Statutory Rate (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 Statutory Federal Tax Rate [Line Items] |  |  |  |  |  |  |  |
Computed "expected" tax expense |  |  |  | $ (12,840) |  |  |  |
Foreign income taxed at different rates |  |  |  | 1,767 |  |  |  |
Uncertain tax positions |  |  |  | (3,219) |  |  |  |
Transition tax |  |  |  | 15,120 |  |  |  |
Valuation allowance - deferred tax assets |  |  |  | (28,387) |  |  |  |
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions |  |  |  | 11 |  |  |  |
Foreign taxes |  |  |  | 845 |  |  |  |
Other, net |  |  |  | 1,481 |  |  |  |
Remeasurement of deferred taxes |  |  |  | 27,261 |  |  |  |
Income tax expense (benefit), Total | $ 5,797 |  |  | $ 2,039 | $ 9,118 |  |  |
Predecessor |  |  |  |  |  |  |  |
Reconciliation Of Statutory Federal Tax Rate [Line Items] |  |  |  |  |  |  |  |
Computed "expected" tax expense |  |  | $ (576,850) |  |  |  |  | $ (225,265)
Foreign income taxed at different rates |  |  | 448,805 |  |  |  |  | 232,904
Uncertain tax positions |  |  | 4,674 |  |  |  |  | 3,007
Chapter 11 reorganization |  |  | 50,428 |  |  |  |  |
Nondeductible transaction costs |  |  | 2,628 |  |  |  |  |
Transition tax |  |  |  |  |  |  |  | 5,587
Valuation allowance - deferred tax assets |  |  | 69,278 |  |  |  |  | (2,377)
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions |  |  | (822) |  |  |  |  | (3,860)
Foreign taxes |  |  | (1,342) |  |  |  |  | (928)
State taxes |  |  | 3 |  |  |  |  | 11
Other, net |  |  | 1,964 |  |  |  |  |
Remeasurement of deferred taxes |  |  |  |  |  |  |  | (2,682)
Income tax expense (benefit), Total |  | $ 295 | $ (1,234) |  |  | $ 2,012 | $ 4,680 | $ 6,397

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