Closing price of stock on date of stock grant.

No definition available.

Name:	stra_ClosingPriceOfStockOnDateOfStockGrant
Namespace Prefix:	stra_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum term of the awards granted under the plan.

+ References

No definition available.

+ Details

Name:	stra_MaximumTermOfAwardsGrantedUnderPlan
Namespace Prefix:	stra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of restricted stock shares for which certain performance criteria more than likely would not be achieved.

+ References

No definition available.

+ Details

Name:	stra_NumberOfSharesNotMeetingPerformanceCriteria
Namespace Prefix:	stra_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Reduction in stock based compensation.

+ References

No definition available.

+ Details

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

- Definition

Restricted stock awarded subject to performance condition.

+ References

No definition available.

+ Details

Name:	stra_RestrictedStockAwardSubjectToPerformanceCondition
Namespace Prefix:	stra_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Share based compensation arrangement by share based payment award award vesting date.

+ References

No definition available.

+ Details

Name:	stra_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingDate
Namespace Prefix:	stra_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BoardOfDirectorsChairmanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock Options, Restricted Stock and Restricted Stock Units (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended	1 Months Ended
	Dec. 31, 2014	Feb. 28, 2014	May 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of the awards granted under the Plan	10 years
Stock-based compensation cost which has not yet been recognized	$ 28.8
Stock-based compensation cost recognized period, in months	42 months
Restricted stock awarded subject to performance condition	398,000
Number of shares not meeting performance criteria	45,920
Reduction in stock based compensation	$ 7.0stra_ReductionInStockBasedCompensation
Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants		46,064
Vesting percentage		100.00%
Vesting date		Feb. 28, 2018
Closing price of stock on date of stock grant		$ 33.65
Board of Directors [Member] \| Vesting over four years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants			46,674
Vesting period, years			4 years
Board of Directors [Member] \| Vesting over three years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares approved for grants			15,868
Vesting period, years			3 years
Closing price of stock on date of stock grant			42.85