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 Event (Details) - Definitive agreement with Jet airline company limited - aircraft			12 Months Ended
	Jan. 08, 2019	Dec. 14, 2018	Dec. 31, 2018
Subsequent events
Number of aircrafts		10
Number of aircrafts where sale and leaseback completed			6
Subsequent event
Subsequent events
Number of aircrafts where sale and leaseback completed	4