Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Benefit Plans - Fair Value of Each Award Estimated on Date of Grant Using Black-Scholes-Merton Option-Pricing Formula (Detail)

v3.10.0.1
Share-Based Compensation and Other Benefit Plans - Fair Value of Each Award Estimated on Date of Grant Using Black-Scholes-Merton Option-Pricing Formula (Detail) - Performance Restricted Stock Units [Domain] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 0.00  
Successor [Member]    
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]    
Expected volatility, min   59.63%
Expected volatility, max   62.18%
Dividend yield, min   0.00%
Dividend yield, max   0.00%
Risk-free interest rate, min   1.44%
Risk-free interest rate, max   1.51%
Share-based Compensation Award, Tranche One [Member] | Successor [Member] | Minimum    
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 47.70  
Share-based Compensation Award, Tranche One [Member] | Successor [Member] | Maximum    
Schedule of Benefit Obligations Weighted Average Assumptions [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 65.28