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Property and Equipment (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Property and Equipment [Abstract] |  |
Leasehold improvements reimbursed by lessors as lease incentives | $ 0.1 stra_LeaseholdImprovementsReimbursedByLessorsAsLeaseIncentives | $ 0.3 stra_LeaseholdImprovementsReimbursedByLessorsAsLeaseIncentives
Fixed assets written off | $ 13.6 us-gaap_PropertyPlantAndEquipmentDisposals | $ 0.8 us-gaap_PropertyPlantAndEquipmentDisposals

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