ORGANIZATION - Additional Information (Details) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended				7 Months Ended	9 Months Ended
	Oct. 01, 2021 USD ($) shares	Jun. 12, 2020 USD ($)	Mar. 31, 2021 USD ($) shares	Sep. 30, 2021 USD ($) shares	Jun. 30, 2021 shares	Mar. 31, 2021 shares	Dec. 31, 2020 shares	Jun. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) Vessel Resort Employee	Nov. 05, 2021 USD ($)	Dec. 07, 2020 USD ($) $ / shares
Number of operating vessel | Vessel									78
Resort spas closed date									Mar. 26, 2020
Total number of cruise ship personnel re-embarked | Employee									1,653
Spa personnel furloughed									96.00%
Terminated employment, percentage									66.00%
Percentage of salary reductions for corporate personnel									38.00%
Number of salary reductions for corporate personnel | Employee									0
Dividend declared date									Feb. 26, 2020
Dividends payable				$ 2.4					$ 2.4
Credit Facility [Member]
Proceeds from credit facility, net									7.0
Credit facility, available and undrawn				$ 13.0					$ 13.0
U.S. and Caribbean [Member]
Number of reopened and operating resort spas | Resort									45
2020 Private Placement [Member]
Common stock and warrants sold		$ 75.0
At-the- Market Equity Offering [Member] | Common Stock [Member]
Common shares, par value | $ / shares											$ 0.0001
Common stock, shares sold | shares			1,711,003	551,690	551,690	1,711,003	1,259,195
Proceeds from the issuance of common shares			$ 18.5	$ 5.5				$ 35.1
Remaining available under sales agreement				$ 14.0					$ 14.0
At-the- Market Equity Offering [Member] | Common Stock [Member] | Subsequent Event [Member]
Common stock, shares sold | shares	350,000
Proceeds from the issuance of common shares	$ 3.5
Remaining available under sales agreement										$ 10.0
At-the- Market Equity Offering [Member] | Common Stock [Member] | Maximum [Member]
Aggregate offering price											$ 50.0