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Acquisitions - Additional Information (Details) S/ in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 05, 2018 USD ($) | Nov. 05, 2018 PEN (S/) | Mar. 24, 2016 | Mar. 10, 2016 USD ($) | Mar. 10, 2016 BRL (R$) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 AUD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 BRL (R$)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired |  |  |  |  |  |  |  |  | $ 17,019 | $ 835 | $ 0 |
Payments to purchase noncontrolling interests |  |  |  |  |  |  |  |  | $ 127 | $ 17,443 | $ 25,665 |
Avansys |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred in business combination | $ 19 | S/ 63,000 |  |  |  |  |  |  |  |  |  |
Business acquisitions, net of cash acquired | 17,019 |  |  |  |  |  |  |  |  |  |  |
Debt assumed | $ 874 |  |  |  |  |  |  |  |  |  |  |
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 for acquisition |  |  |  | $ 668 | R$ 2,500 |  |  |  |  |  |  |
Ownership percentage acquired in business combinations |  |  |  |  |  |  |  |  |  |  |  | 10.00%
St. Augustine | Puttable Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, interest acquired |  |  | 20.00% |  |  |  |  |  |  |  |  |
Purchase price multiple of EBITDA |  |  | 7.0 |  |  |  |  |  |  |  |  |
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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