Real Estate - Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
STATEMENTS OF INCOME
Gain on disposition of properties	$ 0	$ 24	$ 10,521	$ 509
Disposal Group, Not Discontinued Operations
STATEMENTS OF INCOME
Revenues	0	2,070	3,522	7,488
Expenses	0	(1,872)	(3,868)	(7,164)
Gain on disposition of properties	0	24	10,521	509
Net income attributable to noncontrolling interests	0	(124)	(4,281)	(475)
Net income attributable to Acadia	$ 0	$ 98	$ 5,894	$ 358

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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