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Significant Accounting Policies - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 10, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Jan. 01, 2019
Accounting Policies [Abstract] |  |  |  |  |  |  |
Unpaid obligations record as restricted assets |  | $ 2,000 | $ 0 | $ 2,000 | $ 0 | $ 5,000 |
Minimum protective endowment held in an interest-bearing account |  | $ 500,000 | $ 500,000 | $ 500,000 | $ 500,000 |  |
Authorized shares of common stock |  | 32,000,000 |  | 32,000,000 |  | 32,000,000 |
Common stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01 |  | $ 0.01 |
Issued shares of common stock |  | 21,948,563 |  | 21,948,563 |  | 21,743,498 |
Outstanding shares of common stock |  | 21,948,563 |  | 21,948,563 |  | 21,743,498 |
Authorized shares of preferred stock |  | 8,000,000 |  | 8,000,000 |  | 8,000,000 |
Issued shares of preferred stock |  | 0 |  | 0 |  | 0 |
Outstanding shares of preferred stock |  | 0 |  | 0 |  | 0 |
Dividends paid per share (in dollars per share) | $ 0.50 |  |  |  |  |  |
Amount of antidilutive securities excluded from computation of earnings per share (in shares) |  | 0 | 0 | 29,000 | 0 |  |
Accumulated other comprehensive income net of tax |  | $ 449,000 |  | $ 449,000 |  | $ 32,000 |
Tax from unrealized gains and losses on marketable securities |  |  |  | 156,000 |  | 10,000 |
Reclassifications from AOCI |  | 0 |  | 0 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Lease liability |  | 113,832,000 |  | 113,832,000 |  |  |
Right-of-use asset |  | 97,484,000 |  | 97,484,000 |  |  |
Other Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Tuition receivable, noncurrent |  | $ 1,200,000 |  | $ 1,200,000 |  | $ 1,100,000 |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Lease liability |  |  |  |  |  |  | $ 123,000,000
Right-of-use asset |  |  |  |  |  |  | $ 107,000,000

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