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Schedule of Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($)
Dec. 31, 2017
Mar. 31, 2017
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]    
Accrued employee benefit plan costs $ 5,838,000  
Stock based compensation 230,000  
Net operating loss and tax credit carryforwards 3,941,000  
Restructuring fees not currently deductible for tax purposes 3,982,000  
Depreciation and amortization 29,160,000  
Other 3,070,000  
Gross deferred tax assets 46,221,000  
Less valuation allowance (43,218,000) $ (2,300,000)
Net deferred tax assets 3,003,000  
Basis difference in partnership (716,000)  
Section 1245 recapture (2,131,000)  
Other (156,000)  
Gross deferred tax liabilities $ (3,003,000)  
Predecessor    
Schedule Of Deferred Income Tax Assets And Liabilities [Line Items]    
Accrued employee benefit plan costs   18,241,000
Stock based compensation   2,940,000
Net operating loss and tax credit carryforwards   14,693,000
Other   5,587,000
Gross deferred tax assets   41,461,000
Less valuation allowance   (2,327,000)
Net deferred tax assets   39,134,000
Basis difference in partnership   (17,322,000)
Depreciation and amortization   (27,355,000)
Gross deferred tax liabilities   (44,677,000)
Net deferred tax assets (liabilities)   $ (5,543,000)