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Business Combinations - Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Aug. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Combination Segment Allocation [Line Items]
Goodwill	$ 732,540		$ 20,744	$ 20,744
Strayer University
Business Combination Segment Allocation [Line Items]
Goodwill	337,381		$ 6,800	$ 6,800
Capella University
Business Combination Segment Allocation [Line Items]
Goodwill	$ 395,159
Capella Merger
Business Combination Segment Allocation [Line Items]
Goodwill		$ 725,740
Capella Merger | Strayer University
Business Combination Segment Allocation [Line Items]
Goodwill		330,600
Capella Merger | Capella University
Business Combination Segment Allocation [Line Items]
Goodwill		$ 395,200

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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