SHAREHOLDER'S EQUITY (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	Apr. 22, 2021 $ / shares shares	Apr. 13, 2021 $ / shares shares	Dec. 31, 2021 USD ($) item $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 shares
SHAREHOLDER'S EQUITY
Number of classes of limited partner interests | item			2
Number of units vested			0
Repurchase right | $			$ 0
Common stock, shares authorized	900,000,000	500,000,000	900,000,000	500,000,000
Common stock, par value | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Stock split ratio		109,673.709
Number of restricted shares issued upon conversion of units				7,843,107	3,692,699
Preferred stock shares authorized	100,000,000		100,000,000	0
Preferred stock par value | $ / shares			$ 0.0001	$ 0.0001
Total authorized shares under certificate of incorporation	1,000,000,000
Common stock issued and outstanding			113,642,487	118,854,249
Latham Investment Holdings, LP
SHAREHOLDER'S EQUITY
Ownership interest of parent before reorganization			100.00%
Class A Units
SHAREHOLDER'S EQUITY
Number of units converted	194,207,115
Number of shares issued upon conversion of units	97,187,596
Class B Units
SHAREHOLDER'S EQUITY
Number of units converted	26,158,894
Number of shares issued upon conversion of units	4,145,987
Number of restricted shares issued upon conversion of units	8,340,126