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Earnings Per Share - Calculation of Fully Diluted Earnings Per Share from Continuing 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
Fully diluted earnings (loss) per share from continuing operations
Net income (loss) from continuing operations available to common stockholders									$ 48,908	$ 47,562	$ 76,855
Net income (loss) for fully diluted shares									$ 70,430	$ 62,054	$ 76,855
Weighted-average shares:
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
Fully diluted weighted-average shares of common stock outstanding	365,259	549,244	546,123	538,442	351,431	346,060	522,984	516,066		459,743
Fully diluted earnings (loss) per share from continuing operations									$ 0.13	$ 0.13	$ 0.24
Continuing Operations [Member]
Fully diluted earnings (loss) per share from continuing operations
Net income (loss) from continuing operations available to common stockholders									$ 48,908	$ 47,562	$ 76,855
Allocations of net income (loss) to limited partnership interests, net of tax									21,522	14,492
Net income (loss) for fully diluted shares									$ 70,430	$ 62,054	$ 76,855
Weighted-average shares:
Common stock outstanding									361,736	344,332	322,141
Partnership units									183,130	114,006
RSUs (Treasury stock method)									737	38	368
Other									1,245	1,367	1,335
Fully diluted weighted-average shares of common stock outstanding									546,848	459,743	323,844
Fully diluted earnings (loss) per share from continuing operations									$ 0.13	$ 0.13	$ 0.24

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