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		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic earnings per share
Net income available to common stockholders	[1]	$ 72,101	$ 85,475	$ 75,703	$ 118,599
Basic weighted-average shares of common stock outstanding (in shares)		179,501	177,020	178,527	178,122
Basic earnings per share (in usd per share)		$ 0.40	$ 0.48	$ 0.42	$ 0.67
Reduction for dividends on preferred stock or units		$ 3,200	$ 3,200	$ 8,100	$ 9,700

[1] Includes a reduction for dividends on preferred stock or exchangeable preferred partnership units in the amount of $3.2 million and $8.1 million for the three and nine months ended September 30, 2020, respectively, and $3.2 million and $9.7 million for the three and nine months ended September 30, 2019, respectively (see Note 1 — “Organization and Basis of Presentation”).