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Fair Value Measurements - Additional Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Fair Value Option Quantitative Disclosures [Line Items] |  |
Real estate impairment loss | $ 42,000,000 | $ 46,000,000
Level 3 [Member] | Fair Value Nonrecurring [Member] |  |
Fair Value Option Quantitative Disclosures [Line Items] |  |
Estimated fair value of real estate assets | $ 94,251,000 |

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