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Federal Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Minimum distribution percentage of annual taxable income to qualify as REIT | 90.00% |
Maximum percentage of total assets consisting of securities of taxable REIT subsidiaries | 20.00% |
Deferred tax assets, additional tax basis in RCP Investments | $ 0.0 | $ 1.0
Deferred tax assets, capital loss carryforwards | 0.1 | 0.0
Deferred tax assets, operating loss carryforwards | $ 2.0 | $ 1.1

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