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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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