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Earnings Per Share - Calculation of Fully Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fully diluted (loss) earnings per share
Net income (loss) available to common stockholders	$ 58,774	$ 36,825
Allocations of net income (loss) to limited partnership interests, net of tax	29,983	19,809
Net income (loss) for fully diluted shares	$ 88,757	$ 56,634
Weighted-average shares:
Common stock outstanding	307,728	283,399
Partnership units	169,218	159,271
RSUs (Treasury stock method)	604	677
Other	1,385	1,479
Fully diluted weighted-average shares of common stock outstanding	478,935	444,826
Fully diluted earnings (loss) per share	$ 0.19	$ 0.13

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