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Stock Options, Restricted Stock and Restricted Stock Units (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 9,453us-gaap_ShareBasedCompensation	$ 9,291us-gaap_ShareBasedCompensation	$ 5,464us-gaap_ShareBasedCompensation
Tax benefit	3,734us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3,698us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	2,158us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock-based compensation expense, net of income tax	5,719us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	5,593us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax	3,306us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Instruction and educational support [Member]
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	1,736us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = stra_InstructionAndEducationalSupportMember	1,976us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = stra_InstructionAndEducationalSupportMember	3,273us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = stra_InstructionAndEducationalSupportMember
Marketing [Member]
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense
Admissions advisory [Member]
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense
General and administration [Member]
Schedule of stock-based compensation expense
Stock-based compensation expense included in operating expense	$ 7,717us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 7,315us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember	$ 2,191us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

X

- Definition

The amount of expense, net of income tax, recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

No definition available.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ 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 (h)(1)(i)

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

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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