Revenue - Narrative (Details) - USD ($)	6 Months Ended
Jun. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Remaining performance obligations recognition period	12 months
Accounts and notes receivable	$ 618,301,000	$ 535,176,000
Accounts receivable held for sale	4,353,000	34,744,000
Deferred revenue and student deposits, current	351,951,000	312,422,000
Revenue recognized	256,000,000
Capitalized contract cost	7,780,000	0
Capitalized contract cost, accumulated amortization	2,021,000	0
Amortization of capitalized costs	2,021,000
Disposal Group, Held-for-sale, Not Discontinued Operations
Disaggregation of Revenue [Line Items]
Deferred revenue and student deposits	$ 35,379,000	$ 94,951,000
Minimum
Disaggregation of Revenue [Line Items]
Contract cost, amortization period	2 years
Maximum
Disaggregation of Revenue [Line Items]
Contract cost, amortization period	4 years

Contract with Customer, Liability, Current, Held-for-Sale

No definition available.

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- Definition

The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

+ References

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- Definition

Amount of accumulated amortization of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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- Definition

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.

+ References

No definition available.

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- Definition

The face amount of all receivables that will be sold to other entities, including trade and loan receivables.

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- Definition

Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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