Earnings Per Share - Calculation of Fully Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fully diluted (loss) earnings per share
Net income (loss) available to common stockholders	$ 118,864	$ 81,529	$ 212,677	$ 171,274
Allocations of net income (loss) to limited partnership interests, net of tax	52,856	45,966	98,245	94,727
Net income (loss) for fully diluted shares	$ 171,720	$ 127,495	$ 310,922	$ 266,001
Weighted-average shares:
Common stock outstanding	327,932	288,308	319,027	286,200
Partnership units	158,104	167,287	161,974	163,325
RSUs (Treasury stock method)	300	539	412	505
Other	1,300	1,207	1,298	1,318
Fully diluted weighted-average shares of common stock outstanding	487,636	457,341	482,711	451,348
Fully diluted earnings (loss) per share	$ 0.35	$ 0.28	$ 0.64	$ 0.59