Company Background Narrative (Details)	Dec. 31, 2012 location country continent employee
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of continents in which entity operates	3
Number of employees	2,700
Number of worldwide locations	27
Number of countries in which entity operates	11

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