Earnings Per Share - Calculation of Fully Diluted Earnings Per Share from Continuing Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fully diluted earnings (loss) per share:
Net income (loss) from continuing operations available to common stockholders	$ 55,707	$ 73,704	$ (124,803)
Net income (loss) for fully diluted shares	$ 83,531	$ 73,704	$ (124,803)
Weighted-average shares:
Common stock outstanding	344,332	322,141	287,378
Fully diluted earnings (loss) per share from continuing operations	$ 0.16	$ 0.23	$ (0.43)
Continuing Operations [Member]
Fully diluted earnings (loss) per share:
Net income (loss) from continuing operations available to common stockholders	$ 55,707	$ 73,704	$ (124,803)
Allocations of net income (loss) to limited partnership interests, net of tax	27,824
Net income (loss) for fully diluted shares	$ 83,531	$ 73,704	$ (124,803)
Weighted-average shares:
Common stock outstanding	344,332	322,141	287,378
Partnership units	178,813
RSUs (Treasury stock method)	38	368
Other	1,367	1,335
Fully diluted weighted-average shares of common stock outstanding	524,550	323,844	287,378
Fully diluted earnings (loss) per share from continuing operations	$ 0.16	$ 0.23	$ (0.43)