Earnings Per Share and Weighted-Average Shares Outstanding - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Basic earnings per share
Net income available to common stockholders	[1]	$ 5,737	$ 13,680
Basic weighted-average shares of common stock outstanding (in shares)		177,545	178,611
Basic earnings per share (in usd per share)		$ 0.03	$ 0.08
Reduction for dividends on preferred stock or units		$ 2,400	$ 3,200

[1] Includes a reduction for dividends on preferred stock or units in the amount of $2.4 million and $3.2 million for the three months ended March 31, 2020 and 2019, respectively.