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Earnings Per Share - Calculation of Basic Earnings Per Share from Continuing and Discontinued Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Basic earnings (loss) per share
Net income (loss) from continuing operations available to common stockholders									$ 48,908	$ 47,562	$ 76,855
Net income (loss) from discontinued operations available to common stockholders											121,963
Net income (loss) available to common stockholders	$ (2,338)	$ 9,653	$ 27,919	$ 13,674	$ (20,561)	$ (6,305)	$ 13,972	$ 60,456	$ 48,908	$ 47,562	$ 198,818
Basic weighted-average shares of common stock outstanding	365,259	363,244	360,614	358,001	351,431	346,060	341,272	338,403	361,736	344,332	322,141
Continuing operations									$ 0.14	$ 0.14	$ 0.24
Discontinued operations											0.38
Basic earnings (loss) per share	$ (0.01)	$ 0.03	$ 0.08	$ 0.04	$ (0.06)	$ (0.02)	$ 0.04	$ 0.18	$ 0.14	$ 0.14	$ 0.62

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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