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Acquisitions - Additional Information (Details) R$ in Thousands, $ in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 24, 2016 | Mar. 10, 2016 USD ($) | Mar. 10, 2016 BRL (R$) | Mar. 27, 2015 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 AUD ($) | Jan. 31, 2017 USD ($) | Jan. 31, 2017 AUD ($) | Jun. 30, 2016 USD ($) | Jan. 31, 2016 USD ($) | Jan. 31, 2016 AUD ($) | Jul. 31, 2015 USD ($) installment | Jul. 31, 2015 AUD ($) installment | Jul. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 BRL (R$) | Apr. 30, 2015
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,705 | $ 835 | $ 0 | $ 6,705 |  |
Debt assumed |  |  |  |  |  |  |  |  |  |  |  |  |  | 772 |  |  |  |  |
Payments to purchase noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,443 | 25,665 | 5,351 |  |
Seller notes and deferred payments |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,927 |  |  |  |  |
Liabilities recorded for tax other-than-income tax contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 571 |  |
Liabilities recorded for labor contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,466 |  |
Long-term indemnification assets |  |  |  |  |  |  |  |  |  |  |  | $ 2,084 |  | $ 2,084 | $ 98,493 | $ 97,607 | $ 2,084 |  |
Careers Australia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  | $ 835 | $ 1,107 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  |  | $ 7,433 | $ 9,850 |  |  |  |  |  |  |  |  |  |  |  |  |
Uni IBMR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred in business combination | R$ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R$ 2,500 |
Payments to acquisition |  | $ 668 | R$ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired in business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |
Chifley Business School |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  |  |  | $ 386 | $ 500 |  | $ 386 | $ 500 | 464 | $ 600 |  |  |  |  |  |
Debt assumed |  |  |  |  |  |  |  |  |  |  |  | $ 772 | $ 1,000 |  |  |  |  |  |
Number of payment tranches | installment |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |  |  |
IADE-Instituto de Artes Visuais Design e Marketing, S.A. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt assumed |  |  |  | $ 3,238 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred in business combination |  |  |  | 10,403 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquisition |  |  |  | 6,476 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Seller notes and deferred payments |  |  |  | $ 689 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,194 |  |
Operating income of acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 971 |  |
Net income of acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 806 |  |
M-Power |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,852 |  |
Ownership percentage acquired in business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00%
INTI Malaysia |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,499 |  |
Ownership percentage acquired in business combinations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.70% |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |
St. Augustine | Puttable Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price multiple of EBITDA | 7.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, interest acquired | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
St. Augustine | Puttable Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, interest acquired |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |
Payments to purchase noncontrolling interests |  |  |  |  |  |  |  |  | $ 24,997 |  |  |  |  |  |  |  |  |  |

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition The amount of indemnification assets (amounts to be reimbursed if and when certain assumed liabilities are paid) recognized at the acquisition date of a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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