Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

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

Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions	Oct. 07, 2018	Oct. 04, 2018
Common Class B \| RIHI
Subsequent events
Ownership interest percentage	42.00%
Parallaxes \| TRA
Subsequent events
Amount owed under the agreement		$ 21.7