Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 67,925us-gaap_ProfitLoss	$ 56,915us-gaap_ProfitLoss	$ 674,993us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, including amortization of debt issuance costs	31,919	31,395	36,363
Straight-lining of rental income	(2,538)us-gaap_StraightLineRent	(3,707)us-gaap_StraightLineRent	(4,475)us-gaap_StraightLineRent
Stock-based compensation expense	394us-gaap_RestrictedStockExpense	394us-gaap_RestrictedStockExpense	300us-gaap_RestrictedStockExpense
Reversal of income tax liability	(420)	(206)	0
Net gain on sale of real estate	0	0	(599,628)
Change in operating assets and liabilities:
Tenant and other receivables, net	712	(972)	234
Other assets	(4,334)	(472)	4,318
Amounts due to Vornado	(42,779)	(3,138)	(2,405)
Accounts payable and accrued expenses	(1,373)	(6,284)	(107)
Other liabilities	(19)	(42)	114
Net cash provided by operating activities	49,487	73,883	109,707
CASH FLOWS FROM INVESTING ACTIVITIES
Construction in progress and real estate additions	(61,964)	(7,671)	(7,351)
Purchases of short-term investments	(24,998)	0	0
Restricted cash	5,442	351	(1,626)
Proceeds from sale of real estate	0	0	714,054
Proceeds from maturing short-term investments	0	0	5,000
Net cash (used in) provided by investing activities	(81,520)	(7,320)	710,077
CASH FLOWS FROM FINANCING ACTIVITIES
Debt repayments	(317,179)us-gaap_RepaymentsOfLongTermDebt	(15,957)us-gaap_RepaymentsOfLongTermDebt	(265,016)us-gaap_RepaymentsOfLongTermDebt
Proceeds from borrowing	300,000	0	0
Dividends paid, including a special dividend of $623,178 in 2012	(66,436)us-gaap_PaymentsOfDividendsCommonStock	(56,197)us-gaap_PaymentsOfDividendsCommonStock	(699,791)us-gaap_PaymentsOfDividendsCommonStock
Debt issuance costs	(4,255)us-gaap_PaymentsOfDebtIssuanceCosts	(87)us-gaap_PaymentsOfDebtIssuanceCosts	(400)us-gaap_PaymentsOfDebtIssuanceCosts
Acquisition of the noncontrolling interest	0	0	(7,800)
Net cash used in financing activities	(87,870)	(72,241)	(973,007)
Net decrease in cash and cash equivalents	(119,903)	(5,678)	(153,223)
Cash and cash equivalents at beginning of period	347,718	353,396	506,619
Cash and cash equivalents at end of period	227,815	347,718	353,396
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments for interest, excluding capitalized interest of $603 in 2014	30,656us-gaap_InterestPaid	42,121us-gaap_InterestPaid	47,932us-gaap_InterestPaid
NON-CASH TRANSACTIONS
Liability for real estate additions included in accounts payable and accrued expenses	13,529alx_NonCashAdditionsToRealEstate	1,084alx_NonCashAdditionsToRealEstate	221alx_NonCashAdditionsToRealEstate
Marketable securities received in connection with the sale of real estate	0alx_CommonStockFromSaleOfRealEstate	0alx_CommonStockFromSaleOfRealEstate	30,000alx_CommonStockFromSaleOfRealEstate
Commission payable to Vornado incurred in connection with the sale of real estate	0	0	7,510
Write-off of fully amortized and/or depreciated assets	$ 10,626	$ 0	$ 648

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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