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Accounts Payable and Accrued Liabilities - Additional Information (Detail) - Basic Management Inc And LandWell - Real Estate Management And Development - Deferred Payment $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2014 | Dec. 31, 2013 USD ($)
Accounts Payable And Accrued Liabilities [Line Items] |  |  |  |
Interest rate |  |  | 3.00% |
Early repayment of obligation |  | $ 9.6 |  |
Recognized accretion expense | $ 0.2 | $ 0.8 |  |
Debt instrument principal amount | $ 1.5 |  |  |
Face Value |  |  |  |
Accounts Payable And Accrued Liabilities [Line Items] |  |  |  |
Business combination consideration transferred, deferred payment obligation |  |  |  | $ 11.1
Present Value | Measurement Input, Discount Rate |  |  |  |
Accounts Payable And Accrued Liabilities [Line Items] |  |  |  |
Discount rate |  |  | 3 |

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