Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator for EPS:
Net income	$ 20,067	$ 40,148
Less: Preferred stock dividends	(3)	(3)
Income available to common stockholders	$ 20,064	$ 40,145
Denominator for EPS:
Weighted average common shares outstanding (in shares)	32,591	34,741
Plus: Assumed conversion of share-based compensation	115	440
Assumed conversion of preferred stock	25	25
Weighted average diluted common shares outstanding (in shares)	32,731	35,206
Basic earnings per common share (in dollars per share)	$ 0.62	$ 1.16
Diluted earnings per common share (in dollars per share)	$ 0.61	$ 1.14