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v3.8.0.1

Other Long-Term Liabilities - Deferred (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Funds received from investor | $ 2.8 |
Deferred payment arrangements value | $ 3.2 | $ 3.6
Minimum |  |
Leasehold improvements and long-term liability amortization period | 5 years |
Maximum |  |
Leasehold improvements and long-term liability amortization period | 10 years |

X
- Definition The value of the deferred payment arrangement with one of the sellers in connection with an acquisition. + References No definition available. + Details
Name: | stra_DeferredPaymentArrangementValue
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Seller's contribution to the Company representing the seller's continuing interest in the assets acquired. + References No definition available. + Details
Name: | stra_FundsReceivedFromInvestor
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Leasehold improvements, long term liability amortization period. + References No definition available. + Details
Name: | stra_LeaseholdImprovementsLongTermLiabilityAmortizationPeriod
Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |