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Commitments and Contingencies - Noncontrolling Interest Holder Put Agreements and Company Call Arrangements (Details) RM in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Jul. 11, 2017 USD ($) | Dec. 31, 2017 USD ($) campus option | Dec. 31, 2017 MYR (RM) campus | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 28, 2016
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Accretion of redeemable noncontrolling interests and equity |  | $ 12,748 |  |  |  |
Purchase of noncontrolling interest |  | $ 917 |  | $ 613 | $ 4,613 |
Disposal Group, Held-for-sale, Not Discontinued Operations | INTI Education Holdings Sdn Bhd |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  | 10.10% |  |  |  |
INTI Education Holdings Sdn Bhd |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Number of campuses of higher education institutions (campus) | campus |  | 5 | 5 |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  | 10.00% |  |  |  |
Pearl Retail Solutions Private Limited and Creative Arts Education Society |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  |  |  |  |  | 45.00%
Pearl Retail Solutions Private Limited |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  | 10.00% |  |  |  |
Puttable Non-controlling Interest |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Total redeemable noncontrolling interests and equity |  | $ 11,435 |  |  |  |
Total noncontrolling interest holder put arrangements |  | 11,435 |  |  |  |
Puttable Common Stock |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Total redeemable noncontrolling interests and equity |  | 9,436 |  |  |  |
Puttable Common Stock | INTI Education Holdings Sdn Bhd |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Total redeemable noncontrolling interests and equity |  | 9,436 |  |  |  |
Total noncontrolling interest holder put arrangements |  | $ 9,436 |  |  |  |
Number of options (option) | option |  | 1 |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  | 10.10% |  |  |  |
Option exercise term |  | 30 days | 30 days |  |  |
Purchase price multiple of EBITDA |  | 8 | 8 |  |  |
Income before income tax, depreciation and amortization |  | $ 9,800 | RM 40,000 |  |  |
Additional purchase price multiple of EBITDA |  | 6 | 6 |  |  |
Option expiration term |  | 30 days | 30 days |  |  |
Puttable Common Stock | Pearl Retail Solutions Private Limited and Creative Arts Education Society |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent | 10.00% |  |  |  |  | 45.00%
Noncontrolling interest, noncontrolling owners, interest acquired | 35.00% |  |  |  |  |
Purchase of noncontrolling interest | $ 11,400 |  |  |  |  |
Puttable Common Stock | Pearl Retail Solutions Private Limited |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Total redeemable noncontrolling interests and equity |  | $ 1,938 |  |  |  |
Total noncontrolling interest holder put arrangements |  | 1,938 |  |  |  |
Callable Noncontrolling Interest, Common Stock | Pearl Retail Solutions Private Limited and Creative Arts Education Society |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Noncontrolling interest, noncontrolling owners, ownership percent |  |  |  |  |  | 35.00%
Percentage of noncontrolling interest of ownership percentage by noncontrolling owners |  |  |  |  |  | 78.00%
Puttable common stock - not currently redeemable |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Total redeemable noncontrolling interests and equity |  | 2,286 |  | $ 3,125 |  |
Total noncontrolling interest holder put arrangements |  | $ 0 |  |  |  |

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