Condensed consolidating financial information Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 25,008us-gaap_ProfitLoss	$ 40,749us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	58,920	50,421
Impairment of Real Estate	14,510us-gaap_ImpairmentOfRealEstate	0us-gaap_ImpairmentOfRealEstate
Equity in earnings of affiliates	(574)	0
Distributions of earnings from unconsolidated joint ventures	491	0
Amortization of loan fees and costs	2,834us-gaap_AmortizationOfFinancingCosts	2,561us-gaap_AmortizationOfFinancingCosts
Amortization of debt premiums/discounts	(82)	205
Amortization of above and below Market Leases	(933)	(816)
Deferred rent	(9,901)us-gaap_StraightLineRent	(11,882)us-gaap_StraightLineRent
Stock compensation expense	3,690us-gaap_ShareBasedCompensation	3,228us-gaap_ShareBasedCompensation
Equity in earnings of affiliates	0	0
Investment gains	(5,937)us-gaap_GainOnSaleOfInvestments	(4,040)us-gaap_GainOnSaleOfInvestments
Investment losses	2,225us-gaap_LossOnSaleOfInvestments	1,694us-gaap_LossOnSaleOfInvestments
Changes in operating assets and liabilities:
Restricted cash	(51)	0
Tenant receivables	(102)	(690)
Deferred leasing costs	(7,131)	(7,572)
Other assets	(3,247)	(17,315)
Accounts payable, accrued expenses, and tenant security deposits	27,121	16,716
Net cash (used in) provided by operating activities	106,841	73,259
Investing Activities
Proceeds from sale of properties	67,616	0
Additions to real estate	(104,632)	(111,587)
Purchase of real estate	(93,938)us-gaap_PaymentsToAcquireRealEstate	(42,338)us-gaap_PaymentsToAcquireRealEstate
Change in restricted cash related to construction projects	0	(140)
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	(28,000)	0
Contributions to unconsolidated real estate entity	(2,539)	(747)
Investments in subsidiaries	0	0
Additions to investments	(15,118)us-gaap_PaymentsToAcquireInvestments	(11,905)us-gaap_PaymentsToAcquireInvestments
Sales of investments	2,345	3,998
Repayment of notes receivable	4,214	0
Net cash (used in) provided by investing activities	(170,052)	(162,719)
Financing Activities
Borrowings from secured notes payable	29,585	51,030
Repayments of borrowings from secured notes payable	(7,934)us-gaap_RepaymentsOfSecuredDebt	(210,844)us-gaap_RepaymentsOfSecuredDebt
Principal borrowings from unsecured senior line of credit	167,000	360,000
Repayments of borrowings from unsecured senior line of credit	(50,000)	(58,000)
Transfers to/from parent company	0are_TransfersDueToDueFromParentEntity	0are_TransfersDueToDueFromParentEntity
Change in restricted cash related to financings	(1,369)	1,059
Deferred financing costs paid	(563)us-gaap_PaymentsOfFinancingCosts	(8)us-gaap_PaymentsOfFinancingCosts
Dividends paid on common stock	(53,295)us-gaap_PaymentsOfDividendsCommonStock	(48,714)us-gaap_PaymentsOfDividendsCommonStock
Dividends paid on preferred stock	(6,247)	(6,471)
Proceeds from Noncontrolling Interests	340	19,410
Distributions to noncontrolling interests	(9,846)us-gaap_PaymentsToMinorityShareholders	(988)us-gaap_PaymentsToMinorityShareholders
Net cash provided by (used in) financing activities	67,671	106,474
Effect of foreign exchange rate changes on cash and cash equivalents	170	260
Net increase (decrease) in cash and cash equivalents	4,630	17,274
Cash and cash equivalents at beginning of period	86,011	57,696
Cash and cash equivalents at end of period	90,641	74,970
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	15,514us-gaap_InterestPaidNet	6,093us-gaap_InterestPaidNet
Non-Cash Investing Activities
Change in accrued construction	(7,249)	(6,028)
Assumption of secured notes payable in connection with purchase of properties	(82,000)us-gaap_NotesAssumed1	(48,329)us-gaap_NotesAssumed1
Payable for purchase of noncontrolling interest	(113,967)	0
Alexandria Real Estate Equities, Inc. (Issuer)
Operating Activities
Net income	24,516	39,554
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	1,247	1,471
Impairment of Real Estate	0
Equity in earnings of affiliates	0
Distributions of earnings from unconsolidated joint ventures	0
Amortization of loan fees and costs	1,925	1,770
Amortization of debt premiums/discounts	80	40
Amortization of above and below Market Leases	0	0
Deferred rent	0	0
Stock compensation expense	3,690	3,228
Equity in earnings of affiliates	(52,120)	(62,505)
Investment gains	0	0
Investment losses	0	0
Changes in operating assets and liabilities:
Restricted cash	4
Tenant receivables	0	0
Deferred leasing costs	0	0
Other assets	(3,437)	(748)
Accounts payable, accrued expenses, and tenant security deposits	32,795	13,478
Net cash (used in) provided by operating activities	8,700	(3,712)
Investing Activities
Proceeds from sale of properties	0
Additions to real estate	0	0
Purchase of real estate	0	0
Change in restricted cash related to construction projects		0
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	0
Contributions to unconsolidated real estate entity	0	0
Investments in subsidiaries	(44,375)	(221,513)
Additions to investments	0	0
Sales of investments	0	0
Repayment of notes receivable	0
Net cash (used in) provided by investing activities	(44,375)	(221,513)
Financing Activities
Borrowings from secured notes payable	0	0
Repayments of borrowings from secured notes payable	0	0
Principal borrowings from unsecured senior line of credit	167,000	360,000
Repayments of borrowings from unsecured senior line of credit	(50,000)	(58,000)
Transfers to/from parent company	(14,038)	0
Change in restricted cash related to financings	0	0
Deferred financing costs paid	0	0
Dividends paid on common stock	(53,295)	(48,715)
Dividends paid on preferred stock	(6,247)	(6,471)
Proceeds from Noncontrolling Interests	0	0
Distributions to noncontrolling interests	0	0
Net cash provided by (used in) financing activities	43,420	246,814
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	7,745	21,589
Cash and cash equivalents at beginning of period	52,491	14,790
Cash and cash equivalents at end of period	60,236	36,379
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	10,412	347
Non-Cash Investing Activities
Change in accrued construction	0	0
Assumption of secured notes payable in connection with purchase of properties	0	0
Payable for purchase of noncontrolling interest	0
Alexandria Real Estate Equities, L.P. (Guarantor Subsidiary)
Operating Activities
Net income	45,549	58,306
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	0	0
Impairment of Real Estate	0
Equity in earnings of affiliates	0
Distributions of earnings from unconsolidated joint ventures	0
Amortization of loan fees and costs	0	0
Amortization of debt premiums/discounts	0	0
Amortization of above and below Market Leases	0	0
Deferred rent	0	0
Stock compensation expense	0	0
Equity in earnings of affiliates	(45,590)	(58,306)
Investment gains	0	0
Investment losses	41	0
Changes in operating assets and liabilities:
Restricted cash	0
Tenant receivables	0	0
Deferred leasing costs	0	0
Other assets	0	0
Accounts payable, accrued expenses, and tenant security deposits	(23)	0
Net cash (used in) provided by operating activities	(23)	0
Investing Activities
Proceeds from sale of properties	0
Additions to real estate	0	0
Purchase of real estate	0	0
Change in restricted cash related to construction projects		0
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	0
Contributions to unconsolidated real estate entity	0	0
Investments in subsidiaries	(2,977)	(193,863)
Additions to investments	0	0
Sales of investments	0	0
Repayment of notes receivable	0
Net cash (used in) provided by investing activities	(2,977)	(193,863)
Financing Activities
Borrowings from secured notes payable	0	0
Repayments of borrowings from secured notes payable	0	0
Principal borrowings from unsecured senior line of credit	0	0
Repayments of borrowings from unsecured senior line of credit	0	0
Transfers to/from parent company	3,000	193,863
Change in restricted cash related to financings	0	0
Deferred financing costs paid	0	0
Dividends paid on common stock	0	0
Dividends paid on preferred stock	0	0
Proceeds from Noncontrolling Interests	0	0
Distributions to noncontrolling interests	0	0
Net cash provided by (used in) financing activities	3,000	193,863
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	63	0
Cash and cash equivalents at end of period	63	0
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	0	0
Non-Cash Investing Activities
Change in accrued construction	0	0
Assumption of secured notes payable in connection with purchase of properties	0	0
Payable for purchase of noncontrolling interest	0
Combined Non- Guarantor Subsidiaries
Operating Activities
Net income	53,570	64,848
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	57,673	48,950
Impairment of Real Estate	14,510
Equity in earnings of affiliates	(574)
Distributions of earnings from unconsolidated joint ventures	491
Amortization of loan fees and costs	909	791
Amortization of debt premiums/discounts	(162)	165
Amortization of above and below Market Leases	(933)	(816)
Deferred rent	(9,901)	(11,882)
Stock compensation expense	0	0
Equity in earnings of affiliates	(917)	(1,148)
Investment gains	(5,937)	(4,040)
Investment losses	2,184	1,694
Changes in operating assets and liabilities:
Restricted cash	(55)
Tenant receivables	(102)	(690)
Deferred leasing costs	(7,131)	(7,572)
Other assets	190	(16,567)
Accounts payable, accrued expenses, and tenant security deposits	(5,651)	3,238
Net cash (used in) provided by operating activities	98,164	76,971
Investing Activities
Proceeds from sale of properties	67,616
Additions to real estate	(104,632)	(111,587)
Purchase of real estate	(93,938)	(42,338)
Change in restricted cash related to construction projects		(140)
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	(28,000)
Contributions to unconsolidated real estate entity	(2,539)	(747)
Investments in subsidiaries	(70)	(6,338)
Additions to investments	(15,118)	(11,905)
Sales of investments	2,345	3,998
Repayment of notes receivable	4,214
Net cash (used in) provided by investing activities	(170,122)	(169,057)
Financing Activities
Borrowings from secured notes payable	29,585	51,030
Repayments of borrowings from secured notes payable	(7,934)	(210,844)
Principal borrowings from unsecured senior line of credit	0	0
Repayments of borrowings from unsecured senior line of credit	0	0
Transfers to/from parent company	58,460	227,851
Change in restricted cash related to financings	(1,369)	1,059
Deferred financing costs paid	(563)	(8)
Dividends paid on common stock	0	1
Dividends paid on preferred stock	0	0
Proceeds from Noncontrolling Interests	340	19,410
Distributions to noncontrolling interests	(9,846)	(988)
Net cash provided by (used in) financing activities	68,673	87,511
Effect of foreign exchange rate changes on cash and cash equivalents	170	260
Net increase (decrease) in cash and cash equivalents	(3,115)	(4,315)
Cash and cash equivalents at beginning of period	33,457	42,906
Cash and cash equivalents at end of period	30,342	38,591
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	5,102	5,746
Non-Cash Investing Activities
Change in accrued construction	(7,249)	(6,028)
Assumption of secured notes payable in connection with purchase of properties	(82,000)	(48,329)
Payable for purchase of noncontrolling interest	(113,967)
Eliminations
Operating Activities
Net income	(98,627)	(121,959)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, Depletion and Amortization	0	0
Impairment of Real Estate	0
Equity in earnings of affiliates	0
Distributions of earnings from unconsolidated joint ventures	0
Amortization of loan fees and costs	0	0
Amortization of debt premiums/discounts	0	0
Amortization of above and below Market Leases	0	0
Deferred rent	0	0
Stock compensation expense	0	0
Equity in earnings of affiliates	98,627	121,959
Investment gains	0	0
Investment losses	0	0
Changes in operating assets and liabilities:
Restricted cash	0
Tenant receivables	0	0
Deferred leasing costs	0	0
Other assets	0	0
Accounts payable, accrued expenses, and tenant security deposits	0	0
Net cash (used in) provided by operating activities	0	0
Investing Activities
Proceeds from sale of properties	0
Additions to real estate	0	0
Purchase of real estate	0	0
Change in restricted cash related to construction projects		0
Payments for (Proceeds from) Deposits on Real Estate Acquisitions	0
Contributions to unconsolidated real estate entity	0	0
Investments in subsidiaries	47,422	421,714
Additions to investments	0	0
Sales of investments	0	0
Repayment of notes receivable	0
Net cash (used in) provided by investing activities	47,422	421,714
Financing Activities
Borrowings from secured notes payable	0	0
Repayments of borrowings from secured notes payable	0	0
Principal borrowings from unsecured senior line of credit	0	0
Repayments of borrowings from unsecured senior line of credit	0	0
Transfers to/from parent company	(47,422)	(421,714)
Change in restricted cash related to financings	0	0
Deferred financing costs paid	0	0
Dividends paid on common stock	0	0
Dividends paid on preferred stock	0	0
Proceeds from Noncontrolling Interests	0	0
Distributions to noncontrolling interests	0	0
Net cash provided by (used in) financing activities	(47,422)	(421,714)
Effect of foreign exchange rate changes on cash and cash equivalents	0	0
Net increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of period	0	0
Cash and cash equivalents at end of period	0	0
Supplemental Disclosure of Cash Flow Information
Cash paid during the period for interest, net of interest capitalized	0	0
Non-Cash Investing Activities
Change in accrued construction	0	0
Assumption of secured notes payable in connection with purchase of properties	0	0
Payable for purchase of noncontrolling interest	$ 0

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The cash outflow for loan and debt issuance costs.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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Payments to develop real estate assets is the process of adding improvements on or to a parcel of land. Such improvements may include drainage, utilities, subdividing, access, buildings, and any combination of these elements; and are generally classified as cash flow from investing activities.

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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