Commitments and Contingencies - Summary of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jul. 11, 2017	Jun. 30, 2017	Dec. 31, 2016
INTI Education Holdings Sdn Bhd
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, noncontrolling owners, ownership percent allowed to be sold	10.00%
Pearl Retail Solutions Private Limited and Creative Arts Education Society
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, noncontrolling owners, ownership percent allowed to be sold	10.00%		45.00%
Puttable Common Stock | INTI Education Holdings Sdn Bhd
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	$ 10,016
Reported Value	10,016
Puttable Common Stock | Pearl Retail Solutions Private Limited and Creative Arts Education Society
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	1,835
Reported Value	1,835
Noncontrolling interest, noncontrolling owners, ownership percent allowed to be sold		10.00%	45.00%
Puttable Preferred Stock | Stamford International University
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	60
Reported Value	60
Puttable Non-controlling Interest
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	11,911
Reported Value	11,911
Puttable common stock - currently redeemable
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	4
Reported Value	4
Puttable common stock - not currently redeemable
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	0
Reported Value	2,300
Puttable Arrangements - Common and Preferred Stock
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of September 30, 2017 redeemable within 12-months:	11,915
Reported Value	$ 14,215			$ 23,876