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Income Taxes - Periods Open to Tax Examination (Details) - Successor
 12 Months Ended
Dec. 31, 2017
Domestic Tax Authority | Earliest Tax Year  
Income Tax Contingency [Line Items]  
Open tax year 2014
Net Operating Loss And Other Carryforwards | Earliest Tax Year  
Income Tax Contingency [Line Items]  
Open tax year 2005
Net Operating Loss And Other Carryforwards | Latest Tax Year  
Income Tax Contingency [Line Items]  
Open tax year 2013
Minimum  
Income Tax Contingency [Line Items]  
Number of tax years open for state tax audit (in years) 3 years
Maximum  
Income Tax Contingency [Line Items]  
Number of tax years open for state tax audit (in years) 5 years