Nature of Business and Significant Accounting Policies - Deferred Revenue and Student Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Sales Revenue, Services, Net
Deferred Revenue Arrangement [Line Items]
Scholarship assistance	$ 7,583	$ 2,589	$ 2,855

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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