Stock-based Compensation Plans - TSR - PSUs Activities (Detail) - Performance Based TSR - PSUs	12 Months Ended
	Dec. 31, 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	[1]
Vested, weighted average grant date fair value | $ / shares	18.51	[2]
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 performances multiple and actual payout was reduced to 100%.