Concentration of Credit Risk (Details)	Jun. 30, 2018 country
Risks and Uncertainties [Abstract]
Number of countries in which entity operates	8

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