Annual report pursuant to Section 13 and 15(d)

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

v3.19.3.a.u2
Share-Based Compensation and Other Benefit Plans - Additional Information (Detail) - USD ($)
$ / shares in Units, $ 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Separation Agreement, Consulting Fees       $ 300  
Share-based Payment Arrangement, Accelerated Cost     $ 200 600  
Share-based compensation (equity-classified) $ (3,800)   (4,082) (4,618) $ (3,809)
Defined Contribution Plan, Cost     900 600 $ 500
Compensation     $ 5,272 4,489  
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     360,615    
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, Award Requisite Service Period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     15,066   98,526
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     113,592    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     15,066    
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 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 1 month 6 days    
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     $ 5,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     13,175    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 30.35    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 3,000 3,300 $ 800
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         $ 47.70
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     $ 34.02   $ 65.28
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     $ 1,400 1,400  
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     $ 300 $ 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