Condensed consolidating financial information Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Condensed Income Statements
Revenue	$ 325,034	$ 273,059	$ 645,173	$ 543,936
Expenses:
Rental operations	91,908	76,980	183,679	154,067
General and administrative	22,939	19,234	45,360	38,463
Interest	38,097	31,748	75,012	61,532
Depreciation and amortization	118,852	104,098	233,071	201,281
Impairment of real estate	6,311	203	6,311	203
Loss on early extinguishment of debt	0	0	0	670
Total expenses	278,107	232,263	543,433	456,216
Equity in earnings of unconsolidated real estate joint ventures	1,090	589	2,234	950
Equity in earnings of affiliates	0	0	0	0
Investment income	12,530	0	98,091	0
Gain (loss) on sale of real estate - rental properties	0	0	0	270
Gain (loss) on sale of real estate - land parcels	0	111	0	111
Net income	60,547	41,496	202,065	89,051
Net income attributable to noncontrolling interests	(5,817)	(7,275)	(11,705)	(13,119)
Net income attributable to Alexandria Real Estate Equities, Inc.’s stockholders	54,730	34,221	190,360	75,932
Dividends on preferred stock	(1,302)	(1,278)	(2,604)	(5,062)
Preferred stock redemption charge	0	0	0	(11,279)
Net income attributable to unvested restricted stock awards	(1,412)	(1,313)	(2,765)	(2,300)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	52,016	31,630	184,991	57,291
Eliminations
Condensed Income Statements
Revenue	(5,837)	(4,960)	(10,402)	(9,597)
Expenses:
Rental operations	0	0	0	0
General and administrative	(5,837)	(4,960)	(10,402)	(9,597)
Interest	0	0	0	0
Depreciation and amortization	0	0	0	0
Impairment of real estate	0	0	0	0
Loss on early extinguishment of debt			0	0
Total expenses	(5,837)	(4,960)	(10,402)	(9,597)
Equity in earnings of unconsolidated real estate joint ventures	0	0	0	0
Equity in earnings of affiliates	(207,290)	(145,034)	(494,294)	(315,985)
Investment income	0		0
Gain (loss) on sale of real estate - rental properties				0
Gain (loss) on sale of real estate - land parcels		0		0
Net income	(207,290)	(145,034)	(494,294)	(315,985)
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Alexandria Real Estate Equities, Inc.’s stockholders	(207,290)	(145,034)	(494,294)	(315,985)
Dividends on preferred stock	0	0	0	0
Preferred stock redemption charge				0
Net income attributable to unvested restricted stock awards	0	0	0	0
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	(207,290)	(145,034)	(494,294)	(315,985)
Alexandria Real Estate Equities, Inc. (Issuer)
Condensed Income Statements
Revenue	4,965	4,124	9,089	8,107
Expenses:
Rental operations	0	0	0	0
General and administrative	23,001	19,428	44,891	38,674
Interest	32,139	21,831	63,234	48,949
Depreciation and amortization	1,647	1,721	3,324	3,430
Impairment of real estate	0	0	0	0
Loss on early extinguishment of debt			0	670
Total expenses	56,787	42,980	111,449	91,723
Equity in earnings of unconsolidated real estate joint ventures	0	0	0	0
Equity in earnings of affiliates	106,552	73,077	292,720	159,548
Investment income	0		0
Gain (loss) on sale of real estate - rental properties				0
Gain (loss) on sale of real estate - land parcels		0		0
Net income	54,730	34,221	190,360	75,932
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Alexandria Real Estate Equities, Inc.’s stockholders	54,730	34,221	190,360	75,932
Dividends on preferred stock	(1,302)	(1,278)	(2,604)	(5,062)
Preferred stock redemption charge				(11,279)
Net income attributable to unvested restricted stock awards	(1,412)	(1,313)	(2,765)	(2,300)
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	52,016	31,630	184,991	57,291
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)
Condensed Income Statements
Revenue	0	1	0	12
Expenses:
Rental operations	0	0	0	0
General and administrative	0	0	0	0
Interest	0	0	0	0
Depreciation and amortization	0	0	0	0
Impairment of real estate	0	0	0	0
Loss on early extinguishment of debt			0	0
Total expenses	0	0	0	0
Equity in earnings of unconsolidated real estate joint ventures	0	0	0	0
Equity in earnings of affiliates	98,795	70,597	197,677	153,445
Investment income	(97)		376
Gain (loss) on sale of real estate - rental properties				0
Gain (loss) on sale of real estate - land parcels		0		0
Net income	98,698	70,598	198,053	153,457
Net income attributable to noncontrolling interests	0	0	0	0
Net income attributable to Alexandria Real Estate Equities, Inc.’s stockholders	98,698	70,598	198,053	153,457
Dividends on preferred stock	0	0	0	0
Preferred stock redemption charge				0
Net income attributable to unvested restricted stock awards	0	0	0	0
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	98,698	70,598	198,053	153,457
Combined Non- Guarantor Subsidiaries
Condensed Income Statements
Revenue	325,906	273,894	646,486	545,414
Expenses:
Rental operations	91,908	76,980	183,679	154,067
General and administrative	5,775	4,766	10,871	9,386
Interest	5,958	9,917	11,778	12,583
Depreciation and amortization	117,205	102,377	229,747	197,851
Impairment of real estate	6,311	203	6,311	203
Loss on early extinguishment of debt			0	0
Total expenses	227,157	194,243	442,386	374,090
Equity in earnings of unconsolidated real estate joint ventures	1,090	589	2,234	950
Equity in earnings of affiliates	1,943	1,360	3,897	2,992
Investment income	12,627		97,715
Gain (loss) on sale of real estate - rental properties				270
Gain (loss) on sale of real estate - land parcels		111		111
Net income	114,409	81,711	307,946	175,647
Net income attributable to noncontrolling interests	(5,817)	(7,275)	(11,705)	(13,119)
Net income attributable to Alexandria Real Estate Equities, Inc.’s stockholders	108,592	74,436	296,241	162,528
Dividends on preferred stock	0	0	0	0
Preferred stock redemption charge				0
Net income attributable to unvested restricted stock awards	0	0	0	0
Net income attributable to Alexandria Real Estate Equities, Inc.’s common stockholders	108,592	74,436	296,241	162,528
Rental revenues
Condensed Income Statements
Revenue	250,635	211,942	495,120	419,135
Rental revenues \| Eliminations
Condensed Income Statements
Revenue	0	0	0	0
Rental revenues \| Alexandria Real Estate Equities, Inc. (Issuer)
Condensed Income Statements
Revenue	0	0	0	0
Rental revenues \| Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)
Condensed Income Statements
Revenue	0	0	0	0
Rental revenues \| Combined Non- Guarantor Subsidiaries
Condensed Income Statements
Revenue	250,635	211,942	495,120	419,135
Tenant recoveries
Condensed Income Statements
Revenue	72,159	60,470	145,329	121,816
Tenant recoveries \| Eliminations
Condensed Income Statements
Revenue	0	0	0	0
Tenant recoveries \| Alexandria Real Estate Equities, Inc. (Issuer)
Condensed Income Statements
Revenue	0	0	0	0
Tenant recoveries \| Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)
Condensed Income Statements
Revenue	0	0	0	0
Tenant recoveries \| Combined Non- Guarantor Subsidiaries
Condensed Income Statements
Revenue	72,159	60,470	145,329	121,816
Other income
Condensed Income Statements
Revenue	2,240	647	4,724	2,985
Other income \| Eliminations
Condensed Income Statements
Revenue	(5,837)	(4,960)	(10,402)	(9,597)
Other income \| Alexandria Real Estate Equities, Inc. (Issuer)
Condensed Income Statements
Revenue	4,965	4,124	9,089	8,107
Other income \| Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)
Condensed Income Statements
Revenue	0	1	0	12
Other income \| Combined Non- Guarantor Subsidiaries
Condensed Income Statements
Revenue	$ 3,112	$ 1,482	$ 6,037	$ 4,463

Gain (Loss) on Sale of Rental Properties, Net of Applicable Income Taxes

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