OFFSETTING OF ASSETS AND LIABILITIES - Offsetting of financial assets and liabilities (Detail) - USD ($) $ in Thousands	Feb. 12, 2021	Dec. 31, 2020	Dec. 31, 2019
Offsetting [Abstract]
Gross amount recognized of derivative asset		$ 89	$ 11
Gross amount of derivatives assets offset		0	0
Net asset amount of assets presented in the Statement of Financial Condition		89	11
Obligation to return Financial instrument, derivatives assets		0	0
Obligation to return Cash Collateral, derivative assets		(89)	(11)
Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral		0	0
Gross amount recognized of derivative liabilities		1,919
Gross amount of derivative liabilities offset		0
Net derivative liability amount offset presented		1,919
Right to claim Financial instrument, derivatives liabilities		(1,919)
Right to claim Cash Collateral, derivatives liabilities		0
Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral		0
Gross amount recognized of repurchase agreements		300,000	300,000
Gross amount of repurchase agreements offset		0	(200,000)
Net repurchase agreements amount offset presented		300,000	100,000
Right to claim Financial instrument, repurchase agreements		(300,000)	(100,000)
Right to claim Cash Collateral, repurchase agreements		0	0
Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral		0	0
Securities Purchased Under Agreements To Resell Gross		0	200,000
Securities Purchased Under Agreements To Resell Liability		0	(200,000)
Securities Purchased Under Agreements To Resell Not Offset		0	0
Securities Purchased Under Agreements To Resell Collateral Obligation To Return Securities		0	0
Securities Purchased Under Agreements To Resell Collateral Obligation To Return Cash		0	0
Securities Purchased Under Agreements To Resell Amount Offset Against Collateral		0	0
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Gross		89	200,011
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability		0	(200,000)
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Liability Not Offset		89	11
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Collateral Obligation To Return Securities		0	0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash		(89)	(11)
Derivative Asset Securities Purchased Under Agreements To Resell Securities Borrowed Amount Offset Against Collateral		$ 0	$ 0
Gross amount recognized of liabilities	$ 301,919
Gross amount of liabilties offset	0
Net liabilities amount offset presented	301,919
Right to claim Financial instrument, liabilities	(301,919)
Right to claim Cash Collateral, liabilties	0
Net liability amount not offset	$ 0