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v3.8.0.1

Other Long-Term Liabilities - Deferred (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 13, 2016 USD ($) | Aug. 31, 2016 USD ($) | Apr. 30, 2016 USD ($) | Dec. 31, 2017 USD ($) item | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Minimum |  |  |  |  |  |
Leasehold improvements and long-term liability amortization period |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |
Leasehold improvements and long-term liability amortization period |  |  |  | 10 years |  |
New York Code And Design Academy, Inc. |  |  |  |  |  |
Deferred payment arrangements value |  |  |  | $ 0 |  |
Total potential cash payments for acquisition |  |  |  | 25,000,000 |  |
Contingent consideration payment | $ 4,600,000 | $ 500,000 | $ 6,000,000 | 0 |  |
New York Code And Design Academy, Inc. | Maximum |  |  |  |  |  |
Contingent consideration |  |  |  | 11,500,000 | $ 11,500,000 |
Jack Welch Management Institute |  |  |  |  |  |
Funds received from investor |  |  |  | $ 2,800,000 |  |
Deferred payment arrangement number of sellers | item |  |  |  | 1 |  |
Deferred payment arrangements value |  |  |  | $ 3,600,000 |  | $ 3,400,000

X
- Definition The cash outflow associated with the contingent consideration payment arrangements with the acquiree in connection with the acquisition. + References No definition available. + Details
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Namespace Prefix: | stra_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the number of sellers with which the entity has entered into deferred payment arrangements. + References No definition available. + Details
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Namespace Prefix: | stra_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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 Estimate of the total payments in connection with a business combination, includes contingent consideration arrangements and prepaid compensation. + References No definition available. + Details
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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
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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
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Namespace Prefix: | stra_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
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X
- Details
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Data Type: | na
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X
- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

X
- Details
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