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

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- 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. + Details
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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 + Details
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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 + Details
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