Description of Business (Details)	Dec. 31, 2017
Number of Countries in which Entity Operates	50
Number of Stores	70
Entity Number of Employees	4,600

The number of countries in which the entity operates as of balance sheet date.

No definition available.

Name:	us-gaap_NumberOfCountriesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant