Summary of Significant Accounting Policies	9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Revenues and Expenses Historically, we recognized revenues and cruise operating costs for our shorter voyages (voyages of ten days or less) upon voyage completion while we recognized revenues and cruise operating costs for voyages in excess of ten days on a pro-rata basis. We followed this completed voyage recognition approach on our shorter voyages because the difference between prorating revenue from such voyages and recognizing such revenue at the completion of the voyage was immaterial to our consolidated financial statements. As of September 30, 2014, we have changed our methodology and recognized passenger ticket revenues, revenues from onboard and other goods and services and all associated cruise operating costs for all of our uncompleted voyages on a pro-rata basis. We believe that recognizing revenues and cruise operating costs on a pro-rata basis for all voyages is preferable as revenues and expenses are recorded in the period in which the revenue generating activities are performed. The effect of this change was an increase to net income of $16.3 million for each of the quarter and nine months ended September 30, 2014 and was immaterial to these periods. In addition, the change has not been retrospectively applied to prior periods, as the impact of prorating all voyages was immaterial to the respective periods presented. Recent Accounting Pronouncements In January 2014, amended guidance was issued regarding the accounting for service concession arrangements. The new guidance defines a service concession as an arrangement between a public-sector entity grantor and an operating entity under which the operating entity operates and maintains the grantor’s infrastructure for a specified period of time and in return receives payments from the grantor and or third party user for use of the infrastructure. The guidance prohibits the operating entity from accounting for a service concession arrangement as a lease and from recording the infrastructure used in the arrangement within property plant and equipment. This guidance must be applied using a modified retrospective approach and will be effective for our interim and annual reporting periods beginning after December 15, 2014. Early adoption is permitted. The adoption of this newly issued guidance is not expected to have a material impact to our consolidated financial statements. In April 2014, amended guidance was issued changing the requirements for reporting discontinued operations and enhancing the disclosures in this area. The new guidance requires a disposal of a component of an entity or a group of components of an entity to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results. The guidance will be effective prospectively for our interim and annual reporting periods beginning after December 15, 2014. The guidance will impact the reporting and disclosures of future disposals, if any. In May 2014, amended guidance was issued to clarify the principles used to recognize revenue for all entities. The guidance is based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires more detailed disclosures and provides additional guidance for transactions that were not comprehensively addressed in the prior accounting guidance. This guidance must be applied using one of two retrospective application methods and will be effective for our interim and annual reporting periods beginning after December 15, 2016. Early adoption is not permitted. We are currently evaluating the impact of the adoption of this newly issued guidance to our consolidated financial statements. In August 2014, guidance was issued requiring management to evaluate, at each annual and interim reporting period, whether there are conditions or events that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date the financial statements are issued and provide related disclosures. This guidance will be effective for our annual reporting period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early adoption is permitted. The adoption of this newly issued guidance is not expected to have an impact to our consolidated financial statements. Other Revenues and expenses include port costs that vary with guest head counts. The amounts of such port costs included in passenger ticket revenues on a gross basis were $232.7 million and $135.8 million for the third quarters of 2014 and 2013, respectively, and $494.5 million and $368.5 million for the nine months ended September 30, 2014 and 2013, respectively.

Summary of Significant Accounting Policies

Revenues and Expenses

Historically, we recognized revenues and cruise operating costs for our shorter voyages (voyages of ten days or less) upon voyage completion while we recognized revenues and cruise operating costs for voyages in excess of ten days on a pro-rata basis. We followed this completed voyage recognition approach on our shorter voyages because the difference between prorating revenue from such voyages and recognizing such revenue at the completion of the voyage was immaterial to our consolidated financial statements. As of September 30, 2014, we have changed our methodology and recognized passenger ticket revenues, revenues from onboard and other goods and services and all associated cruise operating costs for all of our uncompleted voyages on a pro-rata basis. We believe that recognizing revenues and cruise operating costs on a pro-rata basis for all voyages is preferable as revenues and expenses are recorded in the period in which the revenue generating activities are performed.

The effect of this change was an increase to net income of $16.3 million for each of the quarter and nine months ended September 30, 2014 and was immaterial to these periods. In addition, the change has not been retrospectively applied to prior periods, as the impact of prorating all voyages was immaterial to the respective periods presented.

Recent Accounting Pronouncements

In January 2014, amended guidance was issued regarding the accounting for service concession arrangements. The new guidance defines a service concession as an arrangement between a public-sector entity grantor and an operating entity under which the operating entity operates and maintains the grantor’s infrastructure for a specified period of time and in return receives payments from the grantor and or third party user for use of the infrastructure. The guidance prohibits the operating entity from accounting for a service concession arrangement as a lease and from recording the infrastructure used in the arrangement within property plant and equipment. This guidance must be applied using a modified retrospective approach and will be effective for our interim and annual reporting periods beginning after December 15, 2014. Early adoption is permitted. The adoption of this newly issued guidance is not expected to have a material impact to our consolidated financial statements.

In April 2014, amended guidance was issued changing the requirements for reporting discontinued operations and enhancing the disclosures in this area. The new guidance requires a disposal of a component of an entity or a group of components of an entity to be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity's operations and financial results. The guidance will be effective prospectively for our interim and annual reporting periods beginning after December 15, 2014. The guidance will impact the reporting and disclosures of future disposals, if any.

In May 2014, amended guidance was issued to clarify the principles used to recognize revenue for all entities. The guidance is based on the principle that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The standard also requires more detailed disclosures and provides additional guidance for transactions that were not comprehensively addressed in the prior accounting guidance. This guidance must be applied using one of two retrospective application methods and will be effective for our interim and annual reporting periods beginning after December 15, 2016. Early adoption is not permitted. We are currently evaluating the impact of the adoption of this newly issued guidance to our consolidated financial statements.

In August 2014, guidance was issued requiring management to evaluate, at each annual and interim reporting period, whether there are conditions or events that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date the financial statements are issued and provide related disclosures. This guidance will be effective for our annual reporting period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early adoption is permitted. The adoption of this newly issued guidance is not expected to have an impact to our consolidated financial statements.

Other

Revenues and expenses include port costs that vary with guest head counts. The amounts of such port costs included in passenger ticket revenues on a gross basis were $232.7 million and $135.8 million for the third quarters of 2014 and 2013, respectively, and $494.5 million and $368.5 million for the nine months ended September 30, 2014 and 2013, respectively.