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Earnings Per Share - Calculation of Fully Diluted Earnings Per Share from Discontinued Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fully diluted (loss) earnings per share
Net income (loss) from discontinued operations available to common stockholders		$ 14,776
Weighted-average shares:
Common stock outstanding	338,403	307,728
Discontinued Operations [Member]
Fully diluted (loss) earnings per share
Net income (loss) from discontinued operations available to common stockholders		$ 14,776
Allocations of net income (loss) to limited partnership interests, net of tax		9,113
Net income (loss) for fully diluted shares		$ 23,889
Weighted-average shares:
Common stock outstanding		307,728
Partnership units		169,218
RSUs (Treasury stock method)		604
Other		1,385
Fully diluted weighted-average shares of common stock outstanding		478,935
Fully diluted earnings (loss) per share from discontinued operations		$ 0.05

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