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v3.19.3

Other Long-Term Liabilities - Additional Information (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Other Liabilities, Noncurrent [Line Items] |  |
Deferred rent and other facility costs | $ 1,880,000 | $ 6,837,000
Deferred payment arrangements value | 2,000,000.0 | 3,100,000
Funds received from investor | 2,800,000 |
Long-term lease incentive liability | $ 0 | 2,300,000
Minimum |  |
Other Liabilities, Noncurrent [Line Items] |  |
Leasehold improvements and long-term liability amortization period (in years) | 5 years |
Maximum |  |
Other Liabilities, Noncurrent [Line Items] |  |
Leasehold improvements and long-term liability amortization period (in years) | 10 years |
Asset Retirement Obligation |  |
Other Liabilities, Noncurrent [Line Items] |  |
Deferred rent and other facility costs | $ 2,000,000.0 | $ 1,900,000

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 Represents non-current deferred rent and other facility costs. + References No definition available. + Details
Name: | stra_DeferredRentAndOtherFacilityCostsNonCurrent
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 Represents non-current lease incentive payable. + References No definition available. + Details
Name: | stra_LeaseIncentivePayableNonCurrent
Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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
- Definition [Line Items] for Other Liabilities, Noncurrent [Table] + References No definition available. + Details
Name: | stra_OtherLiabilitiesNoncurrentLineItems
Namespace Prefix: | stra_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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- Details
Name: | stra_ComponentofDeferredRentAxis=stra_AssetRetirementObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |