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 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Restricted Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 3,668,000 $ 6,785,000
Unrecognized stock-based compensation expense, weighted-average recognition period   3 years 7 months 2 days
Unrecognized compensation cost 26,438,000 $ 26,438,000
Market Condition Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense 374,000 $ 1,772,000
Unrecognized stock-based compensation expense, weighted-average recognition period   1 year 6 months 3 days
Unrecognized compensation cost 2,372,000 $ 2,372,000
Additional Share based compensation expense 54,000 54,000
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 2,896,000 $ 4,090,000