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

Property and Equipment (Details) - Passenger	1 Months Ended
Property and Equipment (Details) - Passenger	Sep. 30, 2017	Jul. 31, 2017	Apr. 30, 2017
Subsequent Event [Line Items]
Passenger capacity of ship sold		1,300	1,550
Subsequent Event
Subsequent Event [Line Items]
Passenger capacity of ship sold	700