Real Estate - Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
STATEMENTS OF INCOME
Gain on disposition of properties	$ 683	$ 30,324	$ 5,140
Disposal Group, Not Discontinued Operations
STATEMENTS OF INCOME
Revenues	724	9,786	14,010
Expenses	(1,018)	(8,561)	(11,946)
Gain on disposition of properties	683	30,324	5,140
Net income attributable to noncontrolling interests	(127)	(10,770)	(5,131)
Net income attributable to Acadia	$ 262	$ 20,779	$ 2,073

Amount after tax of income (loss) from a discontinued operation attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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