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Segment Reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
Revenues | $ 66,081 | $ 62,678 | $ 59,504 | $ 61,999 | $ 54,121 | $ 43,855 | $ 43,918 | $ 48,045 | $ 250,262 | $ 189,939 | $ 199,063
Depreciation and amortization |  |  |  |  |  |  |  |  | (104,934) | (70,011) | (60,751)
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | (79,798) | (57,391) | (58,482)
Impairment charges | (10,600) | (3,800) |  |  |  |  |  |  | (14,455) | 0 | (5,000)
General and administrative expenses |  |  |  |  |  |  |  |  | (33,756) | (40,648) | (30,368)
Operating income |  |  |  |  |  |  |  |  | 17,319 | 21,889 | 44,462
Gain on disposition of properties |  |  |  |  |  |  |  |  | 48,886 | 81,965 | 89,063
Interest income |  |  |  |  |  |  |  |  | 29,143 | 25,829 | 16,603
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 23,371 | 39,449 | 37,330
Other |  |  |  |  |  |  |  |  |  |  | 1,596
Interest expense |  |  |  |  |  |  |  |  | (58,978) | (34,645) | (37,297)
Gain on change in control |  |  |  |  |  |  |  |  | 5,571 | 0 | 0
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (1,004) | 105 | (1,787)
Net income | 24,944 | 13,285 | 6,108 | 19,971 | 34,236 | 326 | 26,155 | 73,875 | 64,308 | 134,592 | 149,970
Net income attributable to noncontrolling interests | (4,032) | (418) | 5,952 | (4,340) | (14,415) | 5,786 | (8,237) | (44,950) | (2,838) | (61,816) | (84,262)
Net income attributable to Acadia | 20,912 | $ 12,867 | $ 12,060 | $ 15,631 | 19,821 | $ 6,112 | $ 17,918 | $ 28,925 | 61,470 | 72,776 | 65,708
Real estate at cost | 3,466,482 |  |  |  | 3,382,000 |  |  |  | 3,466,482 | 3,382,000 | 2,736,283
Total assets | 3,960,247 |  |  |  | 3,995,960 |  |  |  | 3,960,247 | 3,995,960 | 3,032,319
Cash paid for acquisition of real estate |  |  |  |  |  |  |  |  | 200,429 | 495,644 | 338,700
Cash paid for development and property improvement costs |  |  |  |  |  |  |  |  | 115,455 | 149,434 | 164,315
Operating segments | Core Portfolio |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 169,975 | 150,211 | 150,015
Depreciation and amortization |  |  |  |  |  |  |  |  | (61,705) | (54,582) | (46,223)
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | (45,349) | (39,598) | (37,259)
Impairment charges |  |  |  |  |  |  |  |  | 0 |  | (5,000)
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  | 62,921 | 56,031 | 61,533
Gain on disposition of properties |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 3,735 | 3,774 | 1,169
Other |  |  |  |  |  |  |  |  |  |  | 0
Interest expense |  |  |  |  |  |  |  |  | (28,618) | (27,435) | (27,945)
Gain on change in control |  |  |  |  |  |  |  |  | 5,571 |  |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 43,609 | 32,370 | 34,757
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (1,107) | (3,411) | (140)
Net income attributable to Acadia |  |  |  |  |  |  |  |  | 42,502 | 28,959 | 34,617
Real estate at cost | 2,032,485 |  |  |  | 1,982,763 |  |  |  | 2,032,485 | 1,982,763 | 1,572,681
Total assets | 2,305,663 |  |  |  | 2,271,620 |  |  |  | 2,305,663 | 2,271,620 | 1,662,092
Cash paid for acquisition of real estate |  |  |  |  |  |  |  |  | 0 | 323,880 | 181,884
Cash paid for development and property improvement costs |  |  |  |  |  |  |  |  | 49,339 | 13,434 | 16,505
Operating segments | Funds |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 80,287 | 39,728 | 49,048
Depreciation and amortization |  |  |  |  |  |  |  |  | (43,229) | (15,429) | (14,528)
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | (34,449) | (17,793) | (21,223)
Impairment charges |  |  |  |  |  |  |  |  | (14,455) |  | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  | (11,846) | 6,506 | 13,297
Gain on disposition of properties |  |  |  |  |  |  |  |  | 48,886 | 81,965 | 89,063
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 19,636 | 35,675 | 36,161
Other |  |  |  |  |  |  |  |  |  |  | 0
Interest expense |  |  |  |  |  |  |  |  | (30,360) | (7,210) | (9,352)
Gain on change in control |  |  |  |  |  |  |  |  | 0 |  |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 26,316 | 116,936 | 129,169
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (1,731) | (58,405) | (84,122)
Net income attributable to Acadia |  |  |  |  |  |  |  |  | 24,585 | 58,531 | 45,047
Real estate at cost | 1,433,997 |  |  |  | 1,399,237 |  |  |  | 1,433,997 | 1,399,237 | 1,163,602
Total assets | 1,500,755 |  |  |  | 1,448,177 |  |  |  | 1,500,755 | 1,448,177 | 1,223,039
Cash paid for acquisition of real estate |  |  |  |  |  |  |  |  | 200,429 | 171,764 | 156,816
Cash paid for development and property improvement costs |  |  |  |  |  |  |  |  | 66,116 | 136,000 | 147,810
Operating segments | Structured Financing |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment charges |  |  |  |  |  |  |  |  | 0 |  | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on disposition of properties |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 29,143 | 25,829 | 16,603
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  |  |  | 1,596
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on change in control |  |  |  |  |  |  |  |  | 0 |  |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 29,143 | 25,829 | 18,199
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Acadia |  |  |  |  |  |  |  |  | 29,143 | 25,829 | 18,199
Real estate at cost | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Total assets | 153,829 |  |  |  | 276,163 |  |  |  | 153,829 | 276,163 | 147,188
Cash paid for acquisition of real estate |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash paid for development and property improvement costs |  |  |  |  |  |  |  |  | 0 | 0 | 0
Unallocated |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Property operating expenses, other operating and real estate taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Impairment charges |  |  |  |  |  |  |  |  | 0 |  | 0
General and administrative expenses |  |  |  |  |  |  |  |  | (33,756) | (40,648) | (30,368)
Operating income |  |  |  |  |  |  |  |  | (33,756) | (40,648) | (30,368)
Gain on disposition of properties |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other |  |  |  |  |  |  |  |  |  |  | 0
Interest expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gain on change in control |  |  |  |  |  |  |  |  | 0 |  |
Income tax (provision) benefit |  |  |  |  |  |  |  |  | (1,004) | 105 | (1,787)
Net income |  |  |  |  |  |  |  |  | (34,760) | (40,543) | (32,155)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income attributable to Acadia |  |  |  |  |  |  |  |  | (34,760) | (40,543) | (32,155)
Real estate at cost | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0
Total assets | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0
Cash paid for acquisition of real estate |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cash paid for development and property improvement costs |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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