Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Name:	us-gaap_GainContingenciesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Subsequent Event (Details) - TransWeb [Member] - USD ($) $ in Thousands	Mar. 07, 2016	Apr. 21, 2012
Gain Contingencies [Line Items]
Litigation settlement		$ 26,147
Settled Litigation [Member] \| Subsequent Event [Member]
Gain Contingencies [Line Items]
Litigation settlement	$ 27,250