Commitments and Contingencies - Summary of Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
INTI Education Holdings Sdn Bhd
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, noncontrolling owners, ownership percent	10.10%
Pearl Retail Solutions Private Limited
Redeemable Noncontrolling Interest [Line Items]
Noncontrolling interest, noncontrolling owners, ownership percent	10.00%
Puttable Common Stock | INTI Education Holdings Sdn Bhd
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of March 31, 2018 redeemable within 12-months:	$ 9,979
Reported Value	9,979
Puttable Common Stock | Pearl Retail Solutions Private Limited
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of March 31, 2018 redeemable within 12-months:	1,972
Reported Value	1,972
Puttable Preferred Stock | Stamford International University
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of March 31, 2018 redeemable within 12-months:	64
Reported Value	64
Puttable Non-controlling Interest
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of March 31, 2018 redeemable within 12-months:	12,015
Reported Value	12,015
Puttable common stock - not currently redeemable
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of March 31, 2018 redeemable within 12-months:	0
Reported Value	2,279
Puttable Arrangements - Common and Preferred Stock
Redeemable Noncontrolling Interest [Line Items]
Estimated Value as of March 31, 2018 redeemable within 12-months:	12,015
Reported Value	$ 14,294	$ 13,721