Fair Value - Non-financial Assets Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Minimum | Measurement Input, Cap Rate | Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investment property, measurement input	0.055
Real estate investment property, discount rate	8.50%
Real estate investment property, restaurant multiple	8.3
Maximum | Measurement Input, Cap Rate | Discounted Cash Flow
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Real estate investment property, measurement input	0.0675
Real estate investment property, discount rate	13.30%
Real estate investment property, restaurant multiple	11.8
Seaport Net investment in real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	$ 321,180
Seaport Net investment in real estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	0
Seaport Net investment in real estate | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	0
Seaport Net investment in real estate | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	321,180
Seaport Investments in unconsolidated ventures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	40,225
Seaport Investments in unconsolidated ventures | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	0
Seaport Investments in unconsolidated ventures | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	0
Seaport Investments in unconsolidated ventures | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value disclosure	$ 40,225