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Significant Accounting Policies - Additional Information (Detail) $ in Thousands | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 | Jun. 30, 2015 EUR (€)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loyalty program liability |  |  |  |  |  |  | $ 562,000 |  | $ 442,000 |  |
Advertising expense | $ 3,300,000 | $ 2,700,000 | $ 2,100,000 |  |  |  |  |  |  |  |
Prepaid marketing expenses |  |  |  |  |  |  | $ 38,000 |  | 23,000 |  |
Effect of adoption |  |  |  |  |  |  |  |  | $ (3,011) |  |
2.5% Senior Notes Due 2022 |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Senior unsecured notes principal amount | € |  |  |  |  |  | € 650,000,000 |  | € 650,000,000 |  |  | € 650,000,000
Senior notes, interest rate |  |  |  |  |  | 2.50% | 2.50% | 2.50% | 2.50% | 2.50% | 2.50%
Stock Options |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Definite lived intangible assets, estimated useful life | 1 year |  |  |  |  |  |  |  |  |  |
Minimum | RSUs |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Definite lived intangible assets, estimated useful life | 12 years |  |  |  |  |  |  |  |  |  |
Maximum | RSUs |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |  |  |  |  |  |
Computer equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives | 3 years |  |  |  |  |  |  |  |  |  |
Computer equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives | 5 years |  |  |  |  |  |  |  |  |  |
Software Development | Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives | 3 years |  |  |  |  |  |  |  |  |  |
Software Development | Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives | 5 years |  |  |  |  |  |  |  |  |  |
Furniture and other equipment | Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives | 3 years |  |  |  |  |  |  |  |  |  |
Furniture and other equipment | Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property and equipment, estimated useful lives | 5 years |  |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  |  |  |  |  | $ 7,037 |  |
ASU 2016-09 | Early Adoption |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Excess tax benefits recognized | $ (60,000) | $ (40,000) |  |  |  |  |  |  |  |  |
ASU 2016-09 | Early Adoption | Retained earnings |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  |  |  |  |  | $ 7,037 |  |
Forecast | ASU 2014-09 | Retained earnings | Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  | $ (15,000) |  |  |  |  |  |
Forecast | ASU 2014-09 | Retained earnings | Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  | (25,000) |  |  |  |  |  |
Forecast | ASU 2014-09 | Retained earnings | Loyalty Program | Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  | (45,000) |  |  |  |  |  |
Forecast | ASU 2014-09 | Retained earnings | Loyalty Program | Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  | (55,000) |  |  |  |  |  |
Forecast | ASU 2014-09 | Retained earnings | Variable Consideration | Minimum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  | 30,000 |  |  |  |  |  |
Forecast | ASU 2014-09 | Retained earnings | Variable Consideration | Maximum |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  |  | $ 40,000 |  |  |  |  |  |
Forecast | ASU 2016-16 | Retained earnings |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Effect of adoption |  |  |  | $ (25,000) |  |  |  |  |  |  |

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