Regulation (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) item	Dec. 31, 2014 state item
Minimum [Member]
Regulation [Line Items]
Average of median annual earning percentage	8.00%
Average of median discretionary percentage	20.00%
Maximum
Regulation [Line Items]
Average of median annual earning percentage	12.00%
Average of median discretionary percentage	30.00%
Strayer University
Regulation [Line Items]
Number of debt-to-earnings measures	2
Number of ineligible years	3 years
Number of current associate degree programs in the Zone	2
Number of consecutive years program has to fail both metrics to become ineligible	2 years
Number of consecutive years program has to fail one metric to become ineligible	4 years
Number of metric that can't failed for consecutive years	1
Number of guidance documents	2
Number of conducted compliance reviews		2
Number of reviews in which no further action was required		3
Number of on-site reviews conducted		4
Number of states in which compliance reviews were conducted | state		3
Strayer University | Maximum
Regulation [Line Items]
Amount due to department of education | $	$ 500