Schedule I - Parent Company Only Financial Statements - Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Other income		$ 15,563	$ 9,570	$ 2,504
Interest income		18,319	14,404	14,557
Total revenues		2,104,231	1,937,810	1,750,951
Expenses:
Interest expense		59,077	41,733	76,958
Total expenses		2,021,606	1,815,838	1,777,866
Gains (losses) on equity method investments		4,115	7,377	4,627
Provision (benefit) for income taxes		53,171	76,120	92,772
Net income (loss) available to common stockholders		55,707	197,520	51,475
Net income (loss) available to common stockholders:
Net income (loss) from discontinued operations			120,438	176,278
Net income (loss) available to common stockholders		$ 55,707	$ 194,142	$ 51,475
Basic earnings (loss) per share:
Continuing operations		$ 0.16	$ 0.23	$ (0.43)
Discontinued operations			0.37	0.61
Basic earnings (loss) per share		$ 0.16	$ 0.60	$ 0.18
Basic weighted-average shares of common stock outstanding		344,332	322,141	287,378
Fully diluted earnings (loss) per share:
Net income for fully diluted shares from continuing operations		$ 83,531	$ 73,704	$ (124,803)
Fully diluted earnings (loss) per share from continuing operations		$ 0.16	$ 0.23	$ (0.43)
Fully diluted weighted-average shares of common stock outstanding		524,550	323,844	287,378
Parent Company [Member]
Revenues:
Other income			$ 36,944
Interest income		$ 55,044	68,382	$ 98,819
Total revenues		55,044	105,326	98,819
Expenses:
Interest expense		55,044	68,382	98,819
Total expenses		55,044	68,382	98,819
Income from operations before income taxes			36,944
Gains (losses) on equity method investments		58,819	49,472	(76,350)
Equity income of discontinued operations, net			123,816	176,278
Provision (benefit) for income taxes		3,112	12,712	48,453
Net income (loss) available to common stockholders		55,707	197,520	51,475
Net income (loss) available to common stockholders:
Net income (loss) from continuing operations		55,707	73,704	(124,803)
Net income (loss) from discontinued operations	[1]		120,438	176,278
Net income (loss) available to common stockholders	[1]	$ 55,707	$ 194,142	$ 51,475
Basic earnings (loss) per share:
Continuing operations		$ 0.16	$ 0.23	$ (0.43)
Discontinued operations			0.37	0.61
Basic earnings (loss) per share		$ 0.16	$ 0.60	$ 0.18
Basic weighted-average shares of common stock outstanding		344,332	322,141	287,378
Fully diluted earnings (loss) per share:
Net income for fully diluted shares from continuing operations		$ 83,531	$ 73,704	$ (124,803)
Fully diluted earnings (loss) per share from continuing operations		$ 0.16	$ 0.23	$ (0.43)
Fully diluted weighted-average shares of common stock outstanding		524,550	323,844	287,378
Net income for fully diluted shares from discontinued operations			$ 120,438	$ 176,278
Fully diluted earnings (loss) per share from discontinued operations			$ 0.37	$ 0.61
Fully diluted weighted-average shares of common stock outstanding			323,844	287,378

[1] In Accordance with ASC 260, includes a reduction for dividends on preferred stock or units, when applicable.