Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income	$ 31,862us-gaap_ProfitLoss	$ 74,106us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	59,431	57,589
Amortization of deferred financing costs	1,073us-gaap_AmortizationOfFinancingCosts	1,510us-gaap_AmortizationOfFinancingCosts
Impairment - real estate assets	15,739us-gaap_ImpairmentOfRealEstate	0us-gaap_ImpairmentOfRealEstate
Equity in earnings of unconsolidated joint ventures	(6,906)	(4,159)
Gain on property dispositions	(2,271)us-gaap_GainLossOnSaleOfProperties	(46,117)us-gaap_GainLossOnSaleOfProperties
Share-based compensation/Non-cash compensation	7,437us-gaap_ShareBasedCompensation	6,580us-gaap_ShareBasedCompensation
Other	(2,990)	(635)
Changes in operating assets and liabilities:
Restricted cash	489	31,726
Accounts receivable	(3,670)	(4,052)
Deferred rent receivable	(5,504)us-gaap_StraightLineRent	(2,765)us-gaap_StraightLineRent
Prepaid expenses and other assets	(13,058)	(26,557)
Accounts payable	(116)	6,562
Accrued interest	12,178	16,441
Other liabilities	(3,718)	(36,537)
Net cash provided by operating activities	89,976	73,692
INVESTING ACTIVITIES
Investment in operating properties - acquisitions	0us-gaap_PaymentsToAcquireBuildings	(37,635)us-gaap_PaymentsToAcquireBuildings
Investment in operating properties - other	(12,805)us-gaap_PaymentsForCapitalImprovements	(16,522)us-gaap_PaymentsForCapitalImprovements
Investments in and advances to unconsolidated joint ventures	(5,822)	(429)
Distributions from unconsolidated joint ventures	6,098	2,978
Net proceeds from disposition of properties/land	40,998	327,160
Net (advances on) proceeds from public reimbursement receivable/escrow	(1,601)	5,001
Investment in development in progress	(48,001)	(74,478)
Investment in land held for development	(4,045)lry_PaymentsToAcquireAndDevelopLand	(1,967)lry_PaymentsToAcquireAndDevelopLand
Investment in deferred leasing costs	(9,684)us-gaap_PaymentsForLeasingCosts	(9,158)us-gaap_PaymentsForLeasingCosts
Net cash (used in) provided by investing activities	(34,862)	194,950
FINANCING ACTIVITIES
Net proceeds from issuance of common shares	12,579	15,472
Proceeds from unsecured notes	398,576	0
Repayment of unsecured notes	(300,000)us-gaap_RepaymentsOfUnsecuredDebt	0us-gaap_RepaymentsOfUnsecuredDebt
Repayments of mortgage loans	(2,160)us-gaap_RepaymentsOfSecuredDebt	(2,019)us-gaap_RepaymentsOfSecuredDebt
Proceeds from credit facility	390,000	0
Repayments on credit facility	(507,000)	0
Payment of deferred financing costs	(3,551)us-gaap_PaymentsOfFinancingCosts	(3,619)us-gaap_PaymentsOfFinancingCosts
Distribution paid on common shares	(70,562)us-gaap_PaymentsOfDividendsCommonStock	(69,634)us-gaap_PaymentsOfDividendsCommonStock
Distribution paid on units	(1,863)	(1,914)
Net cash used in financing activities	(83,981)	(61,714)
Net (decrease) increase in cash and cash equivalents	(28,867)	206,928
(Decrease) increase in cash and cash equivalents related to foreign currency translation	(1,724)	211
Cash and cash equivalents at beginning of period	69,346	163,414
Cash and cash equivalents at end of period	38,755	370,553
Liberty Property Limited Partnership [Member]
OPERATING ACTIVITIES
Net income	31,862	74,106
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	59,431	57,589
Amortization of deferred financing costs	1,073	1,510
Impairment - real estate assets	15,739	0
Equity in earnings of unconsolidated joint ventures	(6,906)	(4,159)
Gain on property dispositions	(2,271)	(46,117)
Share-based compensation/Non-cash compensation	7,437	6,580
Other	(2,990)	(635)
Changes in operating assets and liabilities:
Restricted cash	489	31,726
Accounts receivable	(3,670)	(4,052)
Deferred rent receivable	(5,504)	(2,765)
Prepaid expenses and other assets	(13,058)	(26,557)
Accounts payable	(116)	6,562
Accrued interest	12,178	16,441
Other liabilities	(3,718)	(36,537)
Net cash provided by operating activities	89,976	73,692
INVESTING ACTIVITIES
Investment in operating properties - acquisitions	0	(37,635)
Investment in operating properties - other	(12,805)	(16,522)
Investments in and advances to unconsolidated joint ventures	(5,822)	(429)
Distributions from unconsolidated joint ventures	6,098	2,978
Net proceeds from disposition of properties/land	40,998	327,160
Net (advances on) proceeds from public reimbursement receivable/escrow	(1,601)	5,001
Investment in development in progress	(48,001)	(74,478)
Investment in land held for development	(4,045)	(1,967)
Investment in deferred leasing costs	(9,684)	(9,158)
Net cash (used in) provided by investing activities	(34,862)	194,950
FINANCING ACTIVITIES
Proceeds from unsecured notes	398,576	0
Repayment of unsecured notes	(300,000)	0
Repayments of mortgage loans	(2,160)	(2,019)
Proceeds from credit facility	390,000	0
Repayments on credit facility	(507,000)	0
Payment of deferred financing costs	(3,551)	(3,619)
Capital contributions	12,579	15,472
Distributions to partners	(72,425)	(71,548)
Net cash used in financing activities	(83,981)	(61,714)
Net (decrease) increase in cash and cash equivalents	(28,867)	206,928
(Decrease) increase in cash and cash equivalents related to foreign currency translation	(1,724)	211
Cash and cash equivalents at beginning of period	69,346	163,414
Cash and cash equivalents at end of period	$ 38,755	$ 370,553

The cash outflow associated with the purchase of or development of land held for investment.

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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The cash outflow for loan and debt issuance costs.

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The cash inflow associated with the collection of other receivables not otherwise defined in the taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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The cash inflow associated with the amount received by a corporation from a shareholder during the period.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

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The cash inflow from the additional capital contribution to the entity.

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-Publisher FASB

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- Definition

The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured 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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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 12

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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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-Publisher FASB

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-Paragraph 19

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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.

+ References

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Difference between actual rental income due and rental income recognized on a straight-line basis.

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