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	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
STATEMENTS OF INCOME
Gain on disposition of properties	$ 12,056	$ 5,107	$ 14,070	$ 5,140
Disposal Group, Not Discontinued Operations
STATEMENTS OF INCOME
Revenues	1,071	2,919	5,652	7,542
Expenses	(1,322)	(2,192)	(4,595)	(6,368)
Gain on disposition of properties	12,056	5,107	14,070	5,140	$ 5,140
Net income attributable to noncontrolling interests	(8,675)	(4,089)	(11,045)	(4,155)
Net income attributable to Acadia	$ 3,130	$ 1,745	$ 4,082	$ 2,159

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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