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Significant Accounting Policies - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 16, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Accounting Policies [Abstract] |  |  |  |
Unpaid obligations record as restricted assets |  | $ 850,000 | $ 5,000 | $ 300,000
Minimum protective endowment held in an interest-bearing account |  | $ 500,000 | $ 500,000 |
Authorized shares of common stock |  | 32,000,000 |  | 32,000,000
Common stock, par value (in dollars per share) |  | $ 0.01 |  | $ 0.01
Issued shares of common stock |  | 22,213,587 |  | 21,964,809
Outstanding shares of common stock |  | 22,213,587 |  | 21,964,809
Authorized shares of preferred stock |  | 8,000,000 |  | 8,000,000
Issued shares of preferred stock |  | 0 |  | 0
Outstanding shares of preferred stock |  | 0 |  | 0
Common stock dividends (in dollar per share) | $ 0.60 |  |  |
Amount of antidilutive securities excluded from computation of earnings per share (in shares) |  | 3,000 | 59,000 |
Accumulated other comprehensive income net of tax |  | $ 253,000 |  | $ 233,000
Tax from unrealized gains and losses on marketable securities |  | 98,000 |  | 90,000
Reclassifications from AOCI |  | 0 |  |
Other Assets |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Tuition receivable, noncurrent |  | $ 3,100,000 |  | $ 1,000,000.0

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