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Property and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property and Equipment [Abstract]
Leasehold improvements reimbursed by lessors as lease incentives	$ 0.3	$ 1.1
Fixed assets written off	$ 0.8	$ 12.5

X

- Definition

Increase of leasehold improvements reimbursed by lessors during the period. These reimbursements were capitalized as leasehold improvements and a long-term liability established.

+ References

No definition available.

+ Details

Name:	stra_LeaseholdImprovementsReimbursedByLessorsAsLeaseIncentives
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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

X

- Definition

Amount of divestiture of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentDisposals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration