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Stock-based Compensation Plans - TSR - PSUs Activities (Detail) - Performance Based TSR - PSUs
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Summary of Performance Share Unit Awards outstanding, Number of Units  
Outstanding, Beginning Balance | shares 1,249,524
Granted | shares 223,687 [1]
Vested and issued | shares (325,217) [2]
Forfeited | shares 0
Outstanding, Ending Balance | shares 1,147,994
Summary of Performance Share Unit Awards outstanding, Weighted Average Grant Date Fair Value  
Outstanding, Beginning Balance, weighted average grant date fair value | $ / shares $ 9.55
Granted, weighted average grant date fair value | $ / shares 12.58
Vested and issued, weighted average grant date fair value | $ / shares 18.51
Forfeited, weighted average grant date fair value | $ / shares 0
Outstanding, Ending Balance, weighted average grant date fair value | $ / shares $ 7.60
[1]

These amounts reflect the number of performance units granted. The actual payout of shares may be between zero and 200% of the performance units granted depending on the total shareholder return ranking compared to our peer companies at the vesting date.

[2]

Includes TSR-PSUs awards issued related to the 2018 performance period where the return on our common stock was negative and therefore, the performance multiple and actual payout was reduced to 100%.