Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Benefit Plans - Additional Information (Detail)

v3.20.4
Share-Based Compensation and Other Benefit Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
4 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Accelerated Cost   $ 700 $ 200 $ 600
Share-based compensation (equity-classified) $ (4,600) (3,284) (4,082) (4,618)
Defined Contribution Plan, Cost   900 900 600
Compensation   4,222 5,272  
Pension and Other Postretirement Benefits Cost (Reversal of Cost)   100 $ 100 100
Officer Severance Costs   500    
Executive Transition Costs   $ 1,200    
Time Vested Restricted Stock Units [Domain]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   641,997    
Performance Restricted Stock Units [Domain]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   145,399 15,066  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   258,991    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 1,500    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 3 months 18 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   145,399    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 7.79    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years    
Performance Restricted Stock Units [Domain] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares expected to vest at grant date   0.00%    
Performance Restricted Stock Units [Domain] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares expected to vest at grant date   200.00%    
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount   $ 3,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   281,382    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 4.49    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 2,800 $ 3,000 3,300
Share-based Payment Arrangement, Tranche One [Member] | Performance Restricted Stock Units [Domain]        
Share-based Compensation Arrangement by Share-based Payment Award [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     $ 34.02  
Share-based Payment Arrangement, Tranche One [Member] | Performance Restricted Stock Units [Domain] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [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   $ 2.40    
Share-based Payment Arrangement, Tranche One [Member] | Performance Restricted Stock Units [Domain] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [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   $ 16.02    
Other Pension, Postretirement and Supplemental Plans [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pension and Other Postretirement Benefits Cost (Reversal of Cost)   $ 100 $ 100 100
Liability, Defined Benefit Plan, Noncurrent   $ 1,300 1,300 $ 1,300
Pension Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   6.00%    
Compensation   $ 200 $ 300  
Employees and Directors [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   1,424,600