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Revenue Recognition - Graduation Fund (Details) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($)
Number of free courses | item | 1 |
Number of successfully completed courses | item | 3 |
Consecutive terms of non attendance in which Graduation Fund credits will be lost | item | 1 |
Expected collection period of tuition receivable, current | 12 months |
Graduation fund estimated to be redeemed | $ 20,300 |
Balance at beginning of year | 37,400 | $ 29,499
Revenue deferred | 18,791 | 17,494
Benefit redeemed | (15,792) | (12,551)
Balance at end of year | 40,399 | $ 34,442
Unbilled receivables | $ 2,000 |
Minimum |  |
Expected collection period of tuition receivable, noncurrent | 2 years |
Maximum |  |
Expected collection period of tuition receivable, noncurrent | 4 years |

X
- Definition Current year redemptions of graduation fund credits by students. + References No definition available. + Details
Name: | stra_BenefitRedeemed
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the number of consecutive term of non-attendance in which Graduation Fund credits will be lost. + References No definition available. + Details
Name: | stra_ConsecutiveTermsOfNonAttendanceInWhichGraduationFundCreditsWillBeLost
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated amount of graduation fund to be redeemed in the next twelve months. + References No definition available. + Details
Name: | stra_EstimatedGraduationFundToBeRedeemedNextTwelveMonths
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Expected collection period of tuition receivable current. + References No definition available. + Details
Name: | stra_ExpectedCollectionPeriodOfTuitionReceivableCurrent
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected collection period of tuition receivable noncurrent. + References No definition available. + Details
Name: | stra_ExpectedCollectionPeriodOfTuitionReceivableNoncurrent
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to graduation fund liability. + References No definition available. + Details
Name: | stra_GraduationFundLiability
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of free courses. + References No definition available. + Details
Name: | stra_NumberOfFreeCourses
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of successfully completed courses. + References No definition available. + Details
Name: | stra_NumberOfSuccessfullyCompletedCourses
Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Additional graduation fund liability generated in the current year for services to be performed in the future. + References No definition available. + Details
Name: | stra_RevenueDeferred
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_UnbilledReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |