General (Details)	Dec. 31, 2012 countries
Organization Consolidation And Presentation Of Financial Statements Abstract
Number of Countries in which Entity Operates	24

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