Other Long-Term Liabilities - Deferred (Details) $ in Millions	1 Months Ended		6 Months Ended
	Apr. 30, 2016 USD ($)	Jun. 30, 2007 USD ($) Asset	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Other Long Term Liabilities [Line Items]
Sale price of one of campus buildings		$ 5.8
Gain on sale and lease back of one of campus buildings before tax		$ 2.8
Funds received from investor			$ 2.8
Sale and lease back term		10 years
Number of assets sold | Asset		1
Deferred payment arrangements value			$ 3.1	$ 3.3
Minimum [Member]
Other Long Term Liabilities [Line Items]
Leasehold improvements and long-term liability amortization period			5 years
Maximum [Member]
Other Long Term Liabilities [Line Items]
Leasehold improvements and long-term liability amortization period			10 years
New York Code And Design Academy, Inc.
Other Long Term Liabilities [Line Items]
Deferred payment arrangements value			$ 8.5
Contingent consideration payment	$ 6.0		4.6
New York Code And Design Academy, Inc. | Maximum [Member]
Other Long Term Liabilities [Line Items]
Deferred payment arrangements value			$ 11.5