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Commitments and Contingencies - Additional Information (Detail) $ in Millions |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 15, 2017 USD ($) | May 26, 2014 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) LegalMatter | Dec. 31, 2013 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2016 USD ($)
Litigation relating to occupancy tax |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes | LegalMatter |  |  |  | 96 |  |  |
Number of lawsuits currently active | LegalMatter |  |  |  | 16 |  |  |
Number of lawsuits dismissed to date | LegalMatter |  |  |  | 42 |  |  |
Dismissal based in finding not subject to tax | LegalMatter |  |  |  | 28 |  |  |
Reserve for legal contingencies |  |  |  | $ 43.0 |  |  | $ 71.0
Estimate of loss |  |  |  | 56.0 |  |  |
Colorado | Litigation Related to Other Taxes |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Estimate of loss |  |  |  | 23.0 |  |  |
Hawaii | Litigation Related to Other Taxes |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Pay-to-play occupancy and other tax payments | $ 16.7 |  |  |  | $ 171.0 |  |
Tax refunds received |  |  | $ 132.0 |  |  |  |
Tax paid, net of refunds |  |  |  | 44.0 |  |  |
Hawaii | Litigation Related to Other Taxes | Orbitz Worldwide, Inc. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax refunds received |  |  | $ 22.0 |  |  |  |
City of San Francisco |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Pay-to-play occupancy and other tax payments |  | $ 25.5 |  |  |  | $ 48.0 |
City of San Francisco | Orbitz Worldwide, Inc. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Payments for occupancy and other tax assessments |  |  |  | $ 4.6 |  |  |

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