Description of Business (Details)	12 Months Ended
Dec. 31, 2018 employee office country segment
Description of Business [Abstract]
Number of countries in which entity operates \| country	50
Number of stores \| office	70
Number of employees \| employee	4,700
Number of reportable segments \| segment	2

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration