Contingencies (Details) (TransWeb [Member], USD $) In Thousands, unless otherwise specified	0 Months Ended
Apr. 21, 2012
TransWeb [Member]
Business Acquisition, Purchase Price Withheld Disclosures [Line Items]
Gain contingency not yet recognized	$ 26,147

Amount of judgment or settlement awarded to (against) the entity in respect of litigation.

No definition available.

Name:	us-gaap_LitigationSettlementAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration