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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
STATEMENTS OF INCOME
Gain on disposition of properties, net of tax	$ 5,107	$ 12,972	$ 5,140	$ 12,972
Disposal Group, Not Discontinued Operations
STATEMENTS OF INCOME
Rental revenues	451	5,067	1,966	14,112
Expenses	(525)	(4,722)	(1,853)	(16,593)
Loss (income) from continuing operations of disposed properties before gain on disposition of properties	(74)	345	113	(2,481)
Gain on disposition of properties, net of tax	5,107	12,972	5,140	12,972	$ 48,886
Net (income) loss attributable to noncontrolling interests	(3,540)	(9,440)	(3,381)	(7,429)
Net loss attributable to Acadia	$ 1,493	$ 3,877	$ 1,872	$ 3,062

Amount after tax of income (loss) from a discontinued operation including the portion 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.

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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