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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fully diluted (loss) earnings per share
Net income (loss) from discontinued operations available to common stockholders		$ 87,254		$ 117,068
Weighted-average shares:
Common stock outstanding	346,060	327,932	341,940	319,027
Discontinued Operations [Member]
Fully diluted (loss) earnings per share
Net income (loss) from discontinued operations available to common stockholders		$ 87,254		$ 117,068
Allocations of net income (loss) to limited partnership interests, net of tax		21,648
Net income (loss) for fully diluted shares		$ 108,902		$ 117,068
Weighted-average shares:
Common stock outstanding		327,932		319,027
Partnership units		107,555
RSUs (Treasury stock method)		300		412
Other		1,300		1,298
Fully diluted weighted-average shares of common stock outstanding		437,087		320,737
Fully diluted earnings (loss) per share from discontinued operations		$ 0.25		$ 0.36