Quarterly report pursuant to Section 13 or 15(d)

Share-based Compensation - Additional Information (Detail)

v3.21.2
Share-based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
$ / shares
Jun. 30, 2021
USD ($)
$ / shares
Restricted Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares vested $ 2,595,000 $ 3,117,000
Unrecognized compensation cost 30,047,000 $ 30,047,000
Restricted Shares [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense, weighted-average recognition period   4 years
Restricted Shares [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense, weighted-average recognition period   5 years
Market Condition Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense, weighted-average recognition period   2 years 7 months 6 days
Unrecognized compensation cost 2,649,000 $ 2,649,000
Share-based compensation expense $ 1,155,000 $ 1,403,000
Share-based compensation fair value per share | $ / shares $ 10.76 $ 10.76
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 1,194,000,000 $ 1,194,000,000