ALLOWANCE FOR RISK-SHARING OBLIGATIONS AND GUARANTY OBLIGATION - Summary of Allowance for Risk-Sharing Obligations (Detail) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) loan	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) loan
Allowance for Risk-Sharing Contracts
Beginning balance	$ 30,477	$ 32,410	$ 31,601	$ 44,057	$ 44,057
Provision (benefit) for risk-sharing obligations	(150)	555	(1,274)	(11,092)
Write-offs	(468)	(2,008)	(468)	(2,008)
Ending balance	29,859	30,957	$ 29,859	30,957	$ 31,601
Number of defaulted loans | loan			7		3
Amount of specific reserves placed on defaulted at risk loans	6,500		$ 6,500		$ 2,800
Weighted average remaining life of the at risk servicing portfolio			5 years 9 months 18 days		6 years 4 months 24 days
Fannie Mae DUS program
Allowance for Risk-Sharing Contracts
Maximum quantifiable contingent liability associated with guarantees	$ 12,500,000	$ 11,800,000	$ 12,500,000	$ 11,800,000