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Debt - Debt Refinancing and Senior Notes Due 2019 Exchange Transaction (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 07, 2019 | Feb. 01, 2019 | Feb. 01, 2018 | Apr. 26, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 14, 2020 | Nov. 16, 2020 | Nov. 12, 2020 | Oct. 13, 2020 | Mar. 31, 2020 | Jun. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase payments of long term debt |  |  |  |  | $ 705,353,000 | $ 2,507,790,000 | $ 867,915,000 |  |  |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing under credit facility |  |  |  |  |  | 121,300,000 |  |  |  |  |  |  |
Revolving Credit Facility | Alternate Base Rate (ABR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing under credit facility |  |  |  |  |  | 81,100,000 |  |  |  |  |  |  |
New Credit Agreement | Term Loan One | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.50% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan One | Alternate Base Rate (ABR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.50% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan Two | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan Two | Alternate Base Rate (ABR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan Three | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 2.00% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan Three | Alternate Base Rate (ABR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan Four | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
New Credit Agreement | Term Loan Four | Alternate Base Rate (ABR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.75% |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility and Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  | $ 340,000,000 | $ 1,239,000 |  |  |  |  |  |  |  |  |  |
Incremental borrowing capacity |  |  |  | $ 565,000,000 |  |  |  |  |  |  |  |  |
Senior Secured Credit Facility | Secured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total senior and other debt |  |  |  |  | 0 | $ 202,400,000 |  |  |  |  |  |  |
Second Amended and Restated Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Second Amended and Restated Credit Agreement | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.61% |  |  |  |  |  |  |
Second Amended and Restated Credit Agreement | Revolving Credit Facility | Alternate Base Rate (ABR) |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 5.75% |  |  |  |  |  |  |
Second Amended and Restated Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to consolidated EBITDA ratio |  |  |  | 275.00% |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total senior and other debt |  |  |  |  | 798,725,000 | $ 800,000,000 |  |  |  |  |  |  |
Senior Notes | The Senior Notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  | $ 800,000,000 |  |  |  |  |  |  |  |  |
Senior Notes | The Senior Notes due 2025 | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 8.25% |  |  |  |  |  |  |  |  |
Repurchase price, percent |  |  |  | 106.188% |  |  |  |  |  |  |  |  |
Senior Notes | The Senior Notes due 2025 | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase price, percent |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Senior Notes | Senior Notes, 8.250%, Due 2025, First Sale Offer |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |
Senior Notes | Senior Notes, 8.250%, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 500,000 | $ 775,000 |  | $ 300,000 |  |
Senior Notes | Senior Notes, 8.250%, Due 2025, Second Asset Sale Offer |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 650,000,000 |  |  |
Lines of credit |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total senior and other debt |  |  |  |  | 59,014,000 | 14,542,000 |  |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 59,014,000 | 14,542,000 |  |  |  |  |  |  |
Lines of credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest rate |  |  |  |  | 2.10% |  |  |  |  |  |  |  |
Lines of credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total interest rate |  |  |  |  | 7.93% |  |  |  |  |  |  |  |
Lines of credit | Secured Credit Facility | Walden University |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Receivables and intangibles pledged as collateral |  |  |  |  | $ 407,267,000 | 400,484,000 |  |  |  |  |  |  |
Lines of credit | Secured Credit Facility | United States Guarantors |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of collateral pledged (no more than) |  |  |  |  | 65.00% |  |  |  |  |  |  |  |
Lines of credit | New Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 410,000,000 | $ 385,000,000
Lines of credit | New Credit Facilities | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000,000
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of debt |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |
Repurchase payments of long term debt |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 2.50% | 3.50% |  |  |  |  |  |  |  |  |
Lines of credit | Second Amended and Restated Credit Agreement | Term Loan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.50% | 4.50% |  |  |  |  |  |  |  |  |
Decrease in basis spread on variable rate |  |  | 0.0100 |  |  |  |  |  |  |  |  |  |
Senior Notes, 8.250%, Due 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total senior and other debt |  |  |  |  | $ 798,725,000 | $ 800,000,000 |  |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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