Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Performance Stock Units - Additional Information (Detail)

v3.19.3.a.u2
Stock-Based Compensation - Performance Stock Units - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance stock, shares granted   1,977,594    
Stock-based compensation expenses   $ 9,175,000 $ 4,385,000 $ 12,092,000
2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   6 years    
Performance stock, shares granted   2,544,107    
Performance Stock Units [Member] | 2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 3 years      
Increase in common stock starting price $ 12.48      
Stock-based compensation expenses   $ 225,000    
Unrecognized stock-based compensation expense related to performance stock units   $ 2,000,000    
Unrecognized stock-based compensation expense, expected recognition weighted-average period   54 months    
Performance Stock Units [Member] | Tranche One [Member] | 2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 50.00%      
Performance Stock Units [Member] | Tranche Two [Member] | 2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 100.00%      
Performance Stock Units [Member] | Tranche Three [Member] | 2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 120.00%      
Performance Stock Units [Member] | Three Executive Officers [Member] | 2017 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance stock, shares granted 311,667