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Related Party Transactions - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Mar. 24, 2016 | Jun. 30, 2015
Related Party Transaction [Line Items] |  |  |  |  |  |
Stock issued, aggregate value |  |  | $ 22,575,000 |  |  |
Liberty |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Common stock issued from treasury stock |  | 264,841 |  |  |  |
Treasury stock reissued, price per share |  | $ 85.24 |  |  |  |
Stock issued, aggregate value |  | $ 23,000,000 |  |  |  |
Airplane One | Expedia, Inc |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Airplane ownership interest | 50.00% |  |  |  |  |
Airplane One | Iac |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Airplane ownership interest | 50.00% |  |  |  |  |
Aircraft |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Ownership interest of airplanes | $ 40,000,000 | 30,000,000 |  |  |  |
Airplane Two | Expedia, Inc |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Airplane ownership interest | 50.00% |  |  |  |  |
Airplane Two | Iac |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Airplane ownership interest | 50.00% |  |  |  |  |
Credit Facility |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Credit facility | $ 1,500,000,000 |  |  |  |  |
Reimbursement Agreement | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Proceeds from reimbursement of expenses |  | $ 4,000,000 |  |  |  |
Reimbursement Agreement | Credit Facility | Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Credit facility |  |  |  |  | $ 1,500,000,000.0 |
7.456% Senior Notes Due 2018 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Senior notes, interest rate | 7.456% | 7.456% |  |  |  |
5.95% Senior Notes Due 2020 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Senior notes, interest rate | 5.95% | 5.95% |  | 5.95% |  |
2.5% Senior Notes Due 2022 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Senior notes, interest rate | 2.50% | 2.50% |  | 2.50% |  | 2.50%
4.5% Senior Notes Due 2024 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Senior notes, interest rate | 4.50% | 4.50% |  | 4.50% |  |
5.0% Senior Notes Due 2026 |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Senior notes, interest rate | 5.00% | 5.00% |  | 5.00% |  |

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