Other Long-Term Liabilities - Deferred (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Deferred payment arrangements value		$ 2.9		$ 3.6
Funds received from investor		$ 2.8
Minimum
Leasehold improvements and long-term liability amortization period		5 years
Maximum
Leasehold improvements and long-term liability amortization period		10 years
New York Code And Design Academy, Inc.
Adjustment in fair value of contingent consideration	$ 5.5		$ 7.8