Post-effective amendment to a registration statement that is not immediately effective upon filing

Share-based Compensation - Summary of Activity of Restricted Shares (Detail)

v3.21.2
Share-based Compensation - Summary of Activity of Restricted Shares (Detail) - $ / shares
 1 Months Ended 9 Months Ended
Dec. 31, 2020
Sep. 30, 2021
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Restricted Shares, Opening balance   1,250,000
Number of Restricted Shares, Granted 1,300,000 1,320,700
Number of Restricted Shares, Vested (50,000) (5,000)
Number of Restricted Shares, Vested   (268,400)
Number of Restricted Shares, Ending balance 1,250,000 2,297,300
Weighted Average Grant Date Fair Value, Opening balance   $ 15.28
Weighted Average Grant Date Fair Value, Granted $ 15.30 13.48
Weighted Average Grant Date Fair Value, Vested 15.70 10.66
Weighted Average Grant Date Fair Value, Forfeited 0 13.92
Weighted Average Grant Date Fair Value, Ending balance $ 15.28 $ 14.37
Performance Condition Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Non-vested Opening balance   950,000
Shares, Granted 950,000 783,700
Shares, Forfeited 0 (148,400)
Shares, Non-vested Ending balance 950,000 1,585,300
Weighted Average Grant Date Fair Value, Beginning balance   $ 15.70
Weighted Average Grant Date Fair Value, Granted $ 15.70 15.49
Weighted Average Grant Date Fair Value, Forfeited 0 16.15
Weighted Average Grant Date Fair Value, Ending balance $ 15.70 $ 15.54
Service Condition Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Restricted Shares, Vested   (5,000)
Weighted Average Grant Date Fair Value, Vested   $ 10.66
Shares, Non-vested Opening balance   200,000
Shares, Granted   77,000
Shares, Non-vested Ending balance 200,000 272,000
Weighted Average Grant Date Fair Value, Beginning balance   $ 15.70
Weighted Average Grant Date Fair Value, Granted   14.37
Weighted Average Grant Date Fair Value, Ending balance $ 15.70 $ 15.42
Market Condition Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Non-vested Opening balance   100,000
Shares, Granted 100,000 460,000
Shares, Forfeited 0 (120,000)
Shares, Non-vested Ending balance 100,000 440,000
Weighted Average Grant Date Fair Value, Beginning balance   $ 10.45
Weighted Average Grant Date Fair Value, Granted $ 10.45 9.91
Weighted Average Grant Date Fair Value, Forfeited 0 11.17
Weighted Average Grant Date Fair Value, Ending balance $ 10.45 $ 9.50