Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Basic earnings (loss) per share:
Net income (loss) available to common stockholders	$ (11,402)	$ 8,850	$ 47,554	$ 49,091
Basic weighted-average shares of common stock outstanding (in shares)	387,121	363,244	382,161	360,629
Basic earnings (loss) per share (in dollars per share)	$ (0.03)	$ 0.02	$ 0.12	$ 0.14