Schedule I - Condensed Statements of Financial Condition (Parent Company Only) (Parenthetical) (Detail) - $ / shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	112,766,091	112,766,091
Common stock held by subsidiaries, shares	26,814,213	12,046,140
Series A Preferred Stock [Member]
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0	0
Series B Preferred Stock [Member]
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0	0
Parent Company [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	15,000,000	15,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	112,766,091	112,766,091
Common stock held by subsidiaries, shares	26,814,213	12,046,140
Parent Company [Member] | Series A Preferred Stock [Member]
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Parent Company [Member] | Series B Preferred Stock [Member]
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0