Schedule I - Parent Company Only Financial Statements - Statements of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended		12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Other revenues			$ 19,917	$ 16,371	$ 18,907
Interest and dividend income			45,422	21,007	21,977
Total revenues			2,025,401	1,795,302	2,015,364
Expenses:
Interest expense			77,231	57,932	69,329
Total expenses			1,992,830	1,717,115	2,178,215
Gains (losses) on equity method investments			9,152	10,920	6,706
Provision (benefit) for income taxes			18,934	38,584	23,013
Net income available to common stockholders			36,265	48,712	124,007
Basic earnings (loss) per share
Net income attributable to common stockholders			$ 34,070	$ 48,712	$ 124,007
Basic weighted-average shares of common stock outstanding (in shares)			426,436	371,561	379,215
Fully diluted earnings (loss) per share
Net income (loss) for fully diluted shares			$ 33,943	$ 63,479	$ 173,995
Fully diluted earnings (loss) per share (in dollars per share)			$ 0.07	$ 0.13	$ 0.32
Fully diluted weighted-average shares of common stock outstanding (in shares)			489,989	499,414	540,020
Parent Company
Revenues:
Other revenues	$ 394	$ 797		$ 263	$ 552
Interest and dividend income	17,528	30,700		53,652	60,772
Total revenues	17,922	31,497		53,915	61,324
Expenses:
Interest expense	17,528	30,700		53,652	60,772
Total expenses	17,528	30,700		53,652	60,772
Income from operations before income taxes	394	797		263	552
Gains (losses) on equity method investments	(6,397)	(9,767)		42,207	114,971
Provision (benefit) for income taxes	(42,994)	(8,244)		(6,242)	(8,484)
Net income available to common stockholders	36,991	(726)		48,712	124,007
Basic earnings (loss) per share
Net income attributable to common stockholders	$ 34,796	$ (726)		$ 48,712	$ 124,007
Basic earnings (loss) per share (in dollars per share)	$ 0.08	$ (0.00)		$ 0.13	$ 0.33
Basic weighted-average shares of common stock outstanding (in shares)	426,436	383,528		371,561	379,215
Fully diluted earnings (loss) per share
Net income (loss) for fully diluted shares	$ 34,669	$ (726)		$ 63,479	$ 173,995
Fully diluted earnings (loss) per share (in dollars per share)	$ 0.07	$ 0.00		$ 0.13	$ 0.32
Fully diluted weighted-average shares of common stock outstanding (in shares)	489,989	383,528		499,414	540,020