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Restructuring and Related Charges (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013 Campus
Restructuring Cost and Reserve [Line Items]
Restructuring liabilities	$ 6.0us-gaap_RestructuringReserveCurrent	$ 10.4us-gaap_RestructuringReserveCurrent
Adjustments for lease and related costs primarily	4.1stra_RestructuringAndRelatedCostAdjustmentForLeaseAndRelatedCost
Adjustments of accretion of interest on lease costs	1.3us-gaap_AccretionExpense
Campus location closed		20stra_CampusLocationClosed
Lease term expire		2022
Lease marginal borrowing rate	4.50%stra_MarginalBorrowingRateOfLease
Severance and other employee separation costs		6.9stra_SeveranceAndOtherEmployeeSeparationCosts
Lease and Related Costs, Net [Member]
Restructuring Cost and Reserve [Line Items]
Contractual obligation		$ 36.0us-gaap_ContractualObligation / us-gaap_RestructuringCostAndReserveAxis = stra_LeaseAndRelatedCostsMember

X

- Definition

Campus location closed.

+ References

No definition available.

+ Details

Name:	stra_CampusLocationClosed
Namespace Prefix:	stra_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The last year for which all current leases will expire.

+ References

No definition available.

+ Details

Name:	stra_LeaseTermExpire
Namespace Prefix:	stra_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Marginal borrowing rate of lease.

+ References

No definition available.

+ Details

Name:	stra_MarginalBorrowingRateOfLease
Namespace Prefix:	stra_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Restructuring and related cost adjustment for lease and related cost.

+ References

No definition available.

+ Details

Name:	stra_RestructuringAndRelatedCostAdjustmentForLeaseAndRelatedCost
Namespace Prefix:	stra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

No definition available.

+ Details

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

X

- Definition

Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 35

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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

X

- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 4



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=stra_LeaseAndRelatedCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: