Share-Based Compensation and Other Employee Benefit Plans - Summary of Changes in the Nonvested Restricted Stock Units (Detail) - Restricted Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Shares
Nonvested balance at beginning of period (in shares) | shares	965
Granted during the year (in shares) | shares	344
Vested during the year (in shares) | shares	(437)
Forfeited during the year (in shares) | shares	(1)
Dividend equivalents adjustment (in shares) | shares	40
Nonvested balance at end of period (in shares) | shares	911
Weighted Average Grant-Date Fair Value
Nonvested balance at beginning of period (in dollars per share) | $ / shares	$ 14.07
Granted during the year (in dollars per share) | $ / shares	17.14
Vested during the year (in dollars per share) | $ / shares	16.31
Forfeited during the year (in dollars per share) | $ / shares	12.62
Dividend equivalents adjustment (in dollars per share) | $ / shares	14.48
Nonvested balance at end of period (in dollars per share) | $ / shares	$ 14.18