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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
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)