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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Mar. 31, 2017
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Schedule Of Deferred Income Tax Assets And Liabilities [Line Items] |  |  |
Accrued employee benefit plan costs |  | $ 5,838 |
Stock based compensation |  | 230 |
Net operating loss and tax credit carryforwards |  | 3,941 |
Restructuring fees not currently deductible for tax purposes |  | 3,982 |
Depreciation and amortization |  | 29,160 |
Other |  | 3,070 |
Gross deferred tax assets |  | 46,221 |
Less valuation allowance | $ (47,700) | (43,218) | $ (2,300)
Net deferred tax assets |  | 3,003 |
Basis difference in partnership |  | (716) |
Section 1245 recapture |  | (2,131) |
Other |  | (156) |
Gross deferred tax liabilities |  | $ (3,003) |
Predecessor |  |  |
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items] |  |  |
Accrued employee benefit plan costs |  |  | 18,241
Stock based compensation |  |  | 2,940
Net operating loss and tax credit carryforwards |  |  | 14,693
Other |  |  | 5,587
Gross deferred tax assets |  |  | 41,461
Less valuation allowance |  |  | (2,327)
Net deferred tax assets |  |  | 39,134
Basis difference in partnership |  |  | (17,322)
Depreciation and amortization |  |  | (27,355)
Gross deferred tax liabilities |  |  | (44,677)
Net deferred tax assets (liabilities) |  |  | $ (5,543)

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