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Summary of Activity of RSU and PSU Awards Under the 2019 Plan (Detail) - 2019 Plan - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
RSU and PSU      
Beginning Balance 721,901 657,620 640,750
Share units granted during the period 207,790 384,428 309,192
Share units vested during the period (285,688) [1] (300,404) (281,377)
Share units forfeited during the period (18,753) (19,743) (10,945)
Ending Balance 625,250 721,901 657,620
Total share units outstanding and expected to vest at period end 590,615    
RSU      
RSU and PSU      
Beginning Balance 538,341 657,620 640,750
Share units granted during the period 102,956 200,868 309,192
Share units vested during the period (278,684) [1] (300,404) (281,377)
Share units forfeited during the period (18,753) (19,743) (10,945)
Ending Balance 343,860 538,341 657,620
PSU      
RSU and PSU      
Beginning Balance [2] 183,560    
Share units granted during the period [2] 104,834 183,560  
Share units vested during the period [1],[2] (7,004)    
Ending Balance [2] 281,390 183,560  
RSU and PSU      
Weighted average grant date fair value      
Beginning Balance $ 14.55 $ 11.95 $ 14.20
Share units granted during the period 44.62 16.96 9.20
Share units vested during the period 12.32 [1] 12.08 13.97
Share units forfeited during the period 12.70 12.62 14.32
Ending Balance 25.37 $ 14.55 $ 11.95
Total share units outstanding and expected to vest at December 31, 2021 $ 25.12    
[1] As of December 31, 2021, an incremental fair value expense of $577 was recognized for certain awards that were modified to accelerate vesting upon retirement.
[2]

The grant date fair value of PSU awards granted during 2021 and 2020 were $55.85 per share and $22.06 per share, respectively. On the settlement date for each measurement period of market-based awards, grantees may receive shares equal to 0% to 200% of the awards granted depending upon the achievement of certain market criteria based on the Company’s TSR relative to the peer group during the three-year performance period.