Long-Term Debt - Additional Information (Details) $ / shares in Units, € in Millions	1 Months Ended			3 Months Ended			9 Months Ended
	Sep. 30, 2025 USD ($) $ / shares shares	Apr. 30, 2025 USD ($) $ / shares shares	Jan. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Jun. 30, 2025 USD ($) item	Mar. 31, 2025 USD ($)	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Jul. 31, 2025 EUR (€)	May 31, 2025 USD ($)	Mar. 31, 2025 EUR (€)	Dec. 31, 2024 USD ($) $ / shares
Debt Instrument [Line Items]
Repayments of long-term debt							$ 7,723,694,000	$ 1,268,605,000
Loss on extinguishment of debt							$ (187,491,000)	$ (29,267,000)
Equity offering shares \| shares	3,313,868
Shares issued, price per share \| $ / shares	$ 24.53	$ 19.06		$ 24.53			$ 24.53
Ordinary shares, par value (in dollars per share) \| $ / shares	0.0012			$ 0.0012			$ 0.0012					$ 0.0012
Equity Offering
Debt Instrument [Line Items]
Equity offering shares \| shares		3,358,098
Series A-3
Debt Instrument [Line Items]
Shares issuable upon exchange \| shares				96,012
Senior Secured Notes Due 2028
Debt Instrument [Line Items]
Interest rate			8.375%
Debt instrument redemption amount			$ 600,000,000
Senior Secured Revolving Loan Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,700,000,000		$ 2,500,000,000					$ 1,700,000,000		$ 1,200,000,000
Number of vessels \| item					9
Senior Secured Revolving Loan Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee percentage			0.15%
Senior Secured Revolving Loan Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee percentage			0.30%
Senior Secured Revolving Loan Facility \| Maturity Date Earlier to January 22, 2030
Debt Instrument [Line Items]
Debt instrument outstanding, threshold			$ 400,000,000
Senior Secured Revolving Loan Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			0.00%
Senior Secured Revolving Loan Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Senior Secured Revolving Loan Facility \| SOFR \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Senior Secured Revolving Loan Facility \| SOFR \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate			2.00%
Senior Unsecured Notes Due 2026
Debt Instrument [Line Items]
Interest rate			5.875%
Debt instrument redemption amount			$ 1,200,000,000
Norwegian Aqua Term Loan
Debt Instrument [Line Items]
Principal amount \| €											€ 1,000.0
Interest rate											1.83%
Export credit facility financing as percentage of contract price											80.00%
Oceania Allura Term Loan
Debt Instrument [Line Items]
Principal amount \| €									€ 570.4
Interest rate									1.50%
Export credit facility financing as percentage of contract price									80.00%
Exchangeable Notes
Debt Instrument [Line Items]
Debt instrument, principal amount denomination for conversion into preferences shares							$ 1,000
Ordinary shares, par value (in dollars per share) \| $ / shares	$ 1,000			$ 1,000			$ 1,000
Re-designated shares \| shares							833,333
1.125% Exchangeable Senior Notes Due 2027
Debt Instrument [Line Items]
Effective interest rate	6.28%			6.28%			6.28%
Debt instrument redemption amount	$ 958,000,000
Debt instrument repurchase amount	$ 1,009,500,000			$ 1,009,500,000			$ 1,009,500,000
2.5% Exchangeable Senior Notes Due 2027
Debt Instrument [Line Items]
Effective interest rate	7.88%			7.88%			7.88%
Debt instrument redemption amount	$ 449,000,000
Debt instrument repurchase amount	$ 480,500,000			$ 480,500,000			$ 480,500,000
Senior Unsecured Notes Due 2032
Debt Instrument [Line Items]
Principal amount			$ 1,800,000,000
Interest rate			6.75%
Senior Unsecured Notes Due 2032 \| Call Date, Scenario One
Debt Instrument [Line Items]
Redemption price as a percentage of face amount			100.00%
Senior Unsecured Notes Due 2032 \| Call Date, Scenario Two
Debt Instrument [Line Items]
Percentage of principal amount of debt redeemed			40.00%
Redemption price as a percentage of face amount			106.75%
Percentage of threshold, after percentage			60.00%
Senior Unsecured Notes Due 2032 \| Interest expense, net
Debt Instrument [Line Items]
Loss on extinguishment of debt						$ 49,500,000
Exchangeable Senior Notes Due 2025
Debt Instrument [Line Items]
Principal amount		$ 353,900,000
Aggregate cash payment, premium		64,000,000
Exchangeable Senior Notes Due 2025 \| Interest expense, net
Debt Instrument [Line Items]
Loss on extinguishment of debt					$ 69,600,000
0.875% Exchangeable Senior Notes Due 2030
Debt Instrument [Line Items]
Principal amount		$ 353,900,000
Effective interest rate	5.04%			5.04%			5.04%
Interest rate		0.875%
Debt instrument, principal amount denomination for conversion into preferences shares		$ 1,000
Ordinary share exchange rate		38.157
Initial exchange price \| $ / shares		$ 26.21
0.875% Exchangeable Senior Notes Due 2030 \| Maximum
Debt Instrument [Line Items]
Ordinary share exchange rate		52.4658
0.750% Exchangeable Senior Notes Due 2030
Debt Instrument [Line Items]
Principal amount	$ 1,400,000,000			$ 1,400,000,000			$ 1,400,000,000
Effective interest rate	6.45%			6.45%			6.45%
Interest rate	0.75%			0.75%			0.75%
Debt instrument, principal amount denomination for conversion into preferences shares	$ 1,000
Ordinary share exchange rate	29.1189
Initial exchange price \| $ / shares	$ 34.34			$ 34.34			$ 34.34
0.750% Exchangeable Senior Notes Due 2030 \| Maximum
Debt Instrument [Line Items]
Ordinary share exchange rate	40.7664
0.750% Exchangeable Senior Notes Due 2030 \| Call Date, Scenario One
Debt Instrument [Line Items]
Percentage of threshold, after percentage	60.00%
Senior Unsecured Notes Due 2031
Debt Instrument [Line Items]
Principal amount	$ 1,200,000,000			$ 1,200,000,000			$ 1,200,000,000
Interest rate	5.875%			5.875%			5.875%
Senior Unsecured Notes Due 2031 \| Call Date, Scenario One
Debt Instrument [Line Items]
Percentage of principal amount of debt redeemed	40.00%
Redemption price as a percentage of face amount	100.00%
Senior Unsecured Notes Due 2031 \| Call Date, Scenario Two
Debt Instrument [Line Items]
Redemption price as a percentage of face amount	105.875%
Senior Unsecured Notes Due 2033
Debt Instrument [Line Items]
Principal amount	$ 850,000,000			$ 850,000,000			$ 850,000,000
Interest rate	6.25%			6.25%			6.25%
Senior Unsecured Notes Due 2033 \| Call Date, Scenario One
Debt Instrument [Line Items]
Percentage of principal amount of debt redeemed	40.00%
Redemption price as a percentage of face amount	100.00%
Percentage of threshold, after percentage	60.00%
Senior Unsecured Notes Due 2033 \| Call Date, Scenario Two
Debt Instrument [Line Items]
Redemption price as a percentage of face amount	106.25%
2027 1.125% Exchangeable Notes, 2027 2.5% Exchangeable Notes, 2026 Notes, 2027 Notes and 2029 Notes
Debt Instrument [Line Items]
Loss on extinguishment of debt				$ 83,400,000

NCL CORP Ltd. 10-Q