Business and Geographic Segment Information - Additional Information (Details)	6 Months Ended	9 Months Ended
	Jun. 30, 2017 segment	Sep. 30, 2017 campus state licensed_institution educational_institution
Segment Reporting Information [Line Items]
Number of additional operating segments created (segment) | segment	3
Brazil
Segment Reporting Information [Line Items]
Number of postsecondary educational institutions (educational institution) | educational_institution		13
Number of states in which entity operates (state) | state		8
Mexico
Segment Reporting Information [Line Items]
Number of postsecondary educational institutions (educational institution) | educational_institution		2
Number of campuses of postsecondary educational institutions (campus) | campus		40
Saudi Arabia
Segment Reporting Information [Line Items]
Number of licensed institutions managed through joint venture arrangements (licensed institution) | licensed_institution		9
China
Segment Reporting Information [Line Items]
Number of licensed institutions managed through joint venture arrangements (licensed institution) | licensed_institution		1