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, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Other revenues			$ 20,658	$ 19,917	$ 16,371
Interest and dividend income			56,223	45,422	21,007
Total revenues			2,262,818	2,025,401	1,795,302
Expenses:
Total expenses			2,182,263	1,992,830	1,717,115
Gains (losses) on equity method investments			8,430	9,152	10,920
Provision (benefit) for income taxes			49,915	18,934	38,584
Net income (loss) available to common stockholders			126,988	36,265	48,712
Basic earnings (loss) per share
Net income (loss) attributable to common stockholders			$ 121,215	$ 34,070	$ 48,712
Basic weighted-average shares of common stock outstanding (in shares)			473,390	426,436	371,561
Fully diluted earnings (loss) per share
Net income (loss) for fully diluted shares			$ 121,268	$ 33,943	$ 63,479
Fully diluted earnings (loss) per share (in dollars per share)			$ 0.25	$ 0.07	$ 0.13
Fully diluted weighted-average shares of common stock outstanding (in shares)			479,142	489,989	499,414
Parent Company
Revenues:
Other revenues	$ 394	$ 797	$ 1,062		$ 263
Interest and dividend income	17,528	30,700	81,066		53,652
Total revenues	17,922	31,497	82,128		53,915
Expenses:
Interest expense	17,528	30,700	81,066		53,652
Total expenses	17,528	30,700	81,066		53,652
Income from operations before income taxes	394	797	1,062		263
Gains (losses) on equity method investments	(6,397)	(9,767)	58,426		42,207
Provision (benefit) for income taxes	(42,994)	(8,244)	(67,500)		(6,242)
Net income (loss) available to common stockholders	36,991	(726)	126,988		48,712
Basic earnings (loss) per share
Net income (loss) attributable to common stockholders	$ 34,796	$ (726)	$ 121,215		$ 48,712
Basic earnings (loss) per share (in dollars per share)	$ 0.08	$ 0.00	$ 0.26		$ 0.13
Basic weighted-average shares of common stock outstanding (in shares)	426,436	383,528	473,390		371,561
Fully diluted earnings (loss) per share
Net income (loss) for fully diluted shares	$ 34,669	$ (726)	$ 121,268		$ 63,479
Fully diluted earnings (loss) per share (in dollars per share)	$ 0.07	$ 0.00	$ 0.25		$ 0.13
Fully diluted weighted-average shares of common stock outstanding (in shares)	489,989	383,528	479,142		499,414