Significant Accounting Policies - Additional Information (Details)		12 Months Ended
	Jan. 01, 2019 USD ($) property lease	Dec. 31, 2019 USD ($) business_segment extension shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Jan. 01, 2020 USD ($)
Accounting Policies [Line Items]
Business segments | business_segment		4
Accrued straight-line rental adjustment		$ 3,402,000	$ 2,731,000	$ 1,222,000
Contingent rents included in revenue		300,000	300,000	400,000
Leasing incentive amortization		700,000	700,000	800,000
Interest capitalized		5,900,000	5,000,000.0	1,300,000
Indirect project costs		3,100,000	3,100,000	$ 2,400,000
Capitalized preacquisition development costs		6,472,000	1,214,000
Impairment charges			1,500,000
Accounts receivable, net		23,470,000	19,016,000
Allowance for doubtful accounts		$ 300,000	$ 600,000
Percentage of taxable income for distributions to stockholders		90.00%
Dilutive shares outstanding (in shares) | shares		0	0	0
Number of ground leases | lease	6
Number of properties subject to ground leases | property	5
Maximum optional ground lease extension term	70 years
Operating lease right-of-use assets		$ 33,088,000
Operating lease liabilities		$ 41,474,000
Weighted average discount rate		5.40%	0.00%
Option to extend, number | extension		1
Adjustment for uncollectable accounts		$ 511,000	$ 419,000	$ 564,000
Allowances for loan losses		0	0
Accrued Straight-line Rental Revenue
Accounting Policies [Line Items]
Accounts receivable, net		$ 17,900,000	$ 15,200,000
Accounting Standards Update 2016-02
Accounting Policies [Line Items]
Operating lease right-of-use assets	$ 32,200,000
Operating lease liabilities	$ 41,400,000
Weighted average discount rate	5.40%
Adjustment for uncollectable accounts	$ 200,000
Minimum
Accounting Policies [Line Items]
Lease term	20 years
Renewal term		1 year
Maximum
Accounting Policies [Line Items]
Lease term	65 years
Renewal term		15 years
Forecast | Subsequent Event | Minimum | Accounting Standard Update 2016-13
Accounting Policies [Line Items]
Allowances for loan losses					$ 2,300,000
Forecast | Subsequent Event | Maximum | Accounting Standard Update 2016-13
Accounting Policies [Line Items]
Allowances for loan losses					$ 3,300,000