Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Benefit Plans (Detail)

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Share-Based Compensation and Other Benefit Plans (Detail) - USD ($)
$ in Thousands
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 12, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Severance Costs     $ 500    
Share-based Payment Arrangement, Accelerated Cost     200 $ 600  
Defined Contribution Plan, Cost     900 600 $ 500
Share-based compensation (equity-classified) $ 3,800   4,082 4,618 3,809
Restricted Stock Units (RSUs)          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount     $ 5,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     13,175    
Stock Options          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition     1 year 1 month 6 days    
Other Pension, Postretirement and Supplemental Plans [Member]          
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]          
Liability, Defined Benefit Plan, Noncurrent     $ 1,400 $ 1,400  
Pension and Other Postretirement Benefits Cost (Reversal of Cost)   $ 100 $ 100   $ 100