Subsequent Event (Details) (Subsequent event, USD $) In Millions, unless otherwise specified	0 Months Ended
Jul. 19, 2013
Subsequent event
Subsequent event
Self-insurance retention for accident occurred at park in Arlington, Texas	$ 2.5

Represents the self-insured retention for the entity.

No definition available.

Name:	six_InsuranceSelfInsuredRetentionValue
Namespace Prefix:	six_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration