Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
OPERATING ACTIVITIES
Net income	$ 224,163us-gaap_ProfitLoss	$ 219,594us-gaap_ProfitLoss	$ 147,751us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	236,075	205,147	167,421
Amortization of deferred financing costs	4,811	4,084	4,858
Equity in (earnings) loss of unconsolidated joint ventures	(10,314)	(6,067)	681
Distributions from unconsolidated joint ventures	0	844	624
Gain on property dispositions	(91,661)us-gaap_GainLossOnSaleOfProperties	(98,403)us-gaap_GainLossOnSaleOfProperties	(12,426)us-gaap_GainLossOnSaleOfProperties
Share-based and Noncash compensation	12,457us-gaap_ShareBasedCompensation	9,976us-gaap_ShareBasedCompensation	10,057us-gaap_ShareBasedCompensation
Other	(7,935)	(8,311)	(3,256)
Changes in operating assets and liabilities:
Restricted cash	30,286	(18,397)	30,713
Accounts receivable	(1,770)	(4,889)	(799)
Deferred rent receivable	(15,263)us-gaap_StraightLineRent	(9,473)us-gaap_StraightLineRent	(6,363)us-gaap_StraightLineRent
Prepaid expenses and other assets	(28,360)	(22,424)	(10,871)
Accounts payable	5,299	15,703	7,641
Accrued interest	(1,264)	5,613	(3,983)
Other liabilities	(20,040)	22,968	(14,882)
Net cash provided by operating activities	336,484	315,965	317,166
INVESTING ACTIVITIES
Investment in properties - acquisitions	(124,962)us-gaap_PaymentsToAcquireBuildings	(1,429,822)us-gaap_PaymentsToAcquireBuildings	(211,894)us-gaap_PaymentsToAcquireBuildings
Investment in properties - other	(102,466)us-gaap_PaymentsForCapitalImprovements	(74,345)us-gaap_PaymentsForCapitalImprovements	(49,682)us-gaap_PaymentsForCapitalImprovements
Investments in and advances to unconsolidated joint ventures	(22,243)	(16,185)	(1,461)
Distributions from unconsolidated joint ventures	15,330	13,774	6,009
Net proceeds from disposition of properties/land	559,322	526,949	234,686
Net proceeds from (advances on) public reimbursement receivable/escrow	2,504	9,821	(986)
Investment in development in progress	(288,375)	(123,879)	(199,384)
Investment in land held for development	(105,324)lry_PaymentsToAcquireAndDevelopLand	(67,326)lry_PaymentsToAcquireAndDevelopLand	(67,513)lry_PaymentsToAcquireAndDevelopLand
Payment of deferred leasing costs	(40,123)lry_InvestmentInDeferredLeasingCosts	(36,901)lry_InvestmentInDeferredLeasingCosts	(22,444)lry_InvestmentInDeferredLeasingCosts
Net cash used in investing activities	(106,337)	(1,197,914)	(312,669)
FINANCING ACTIVITIES
Net proceeds from issuance of Common Shares	58,473	969,468	58,710
Redemption of preferred units	0	(64,500)	(221,000)
Proceeds from unsecured notes	0	448,646	700,000
Repayments of unsecured notes	(200,000)us-gaap_RepaymentsOfUnsecuredDebt	0us-gaap_RepaymentsOfUnsecuredDebt	(230,100)us-gaap_RepaymentsOfUnsecuredDebt
Proceeds from mortgage loans	0	10,401	34,599
Repayments of mortgage loans	(56,156)us-gaap_RepaymentsOfSecuredDebt	(10,605)us-gaap_RepaymentsOfSecuredDebt	(35,099)us-gaap_RepaymentsOfSecuredDebt
Proceeds from credit facility	517,550	611,550	839,250
Repayments on credit facility	(350,550)	(703,550)	(886,650)
Payment of deferred financing costs	(3,629)us-gaap_PaymentsOfFinancingCosts	(5,866)us-gaap_PaymentsOfFinancingCosts	(7,206)us-gaap_PaymentsOfFinancingCosts
Distribution paid on Common Shares	(280,136)us-gaap_PaymentsOfDividendsCommonStock	(240,340)us-gaap_PaymentsOfDividendsCommonStock	(222,573)us-gaap_PaymentsOfDividendsCommonStock
Distribution paid on units	(7,453)	(9,438)	(17,241)
Net cash (used in) provided by financing activities	(321,901)	1,005,766	12,690
Net (decrease) increase in cash and cash equivalents	(91,754)	123,817	17,187
(Decrease) increase in cash and cash equivalents related to foreign currency translation	(2,314)	1,241	2,965
Cash and cash equivalents at beginning of year	163,414	38,356	18,204
Cash and cash equivalents at end of year	69,346	163,414	38,356
Liberty Property Limited Partnership [Member]
OPERATING ACTIVITIES
Net income	224,163	219,594	147,751
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	236,075	205,147	167,421
Amortization of deferred financing costs	4,811	4,084	4,858
Equity in (earnings) loss of unconsolidated joint ventures	(10,314)	(6,067)	681
Distributions from unconsolidated joint ventures	0	844	624
Gain on property dispositions	(91,661)	(98,403)	(12,426)
Share-based and Noncash compensation	12,457	9,976	10,057
Other	(7,935)	(8,311)	(3,256)
Changes in operating assets and liabilities:
Restricted cash	30,286	(18,397)	30,713
Accounts receivable	(1,770)	(4,889)	(799)
Deferred rent receivable	(15,263)	(9,473)	(6,363)
Prepaid expenses and other assets	(28,360)	(22,424)	(10,871)
Accounts payable	5,299	15,703	7,641
Accrued interest	(1,264)	5,613	(3,983)
Other liabilities	(20,040)	22,968	(14,882)
Net cash provided by operating activities	336,484	315,965	317,166
INVESTING ACTIVITIES
Investment in properties - acquisitions	(124,962)	(1,429,822)	(211,894)
Investment in properties - other	(102,466)	(74,345)	(49,682)
Investments in and advances to unconsolidated joint ventures	(22,243)	(16,185)	(1,461)
Distributions from unconsolidated joint ventures	15,330	13,774	6,009
Net proceeds from disposition of properties/land	559,322	526,949	234,686
Net proceeds from (advances on) public reimbursement receivable/escrow	2,504	9,821	(986)
Investment in development in progress	(288,375)	(123,879)	(199,384)
Investment in land held for development	(105,324)	(67,326)	(67,513)
Payment of deferred leasing costs	(40,123)	(36,901)	(22,444)
Net cash used in investing activities	(106,337)	(1,197,914)	(312,669)
FINANCING ACTIVITIES
Redemption of preferred units	0	(64,500)	(221,000)
Proceeds from unsecured notes	0	448,646	700,000
Repayments of unsecured notes	(200,000)	0	(230,100)
Proceeds from mortgage loans	0	10,401	34,599
Repayments of mortgage loans	(56,156)	(10,605)	(35,099)
Proceeds from credit facility	517,550	611,550	839,250
Repayments on credit facility	(350,550)	(703,550)	(886,650)
Payment of deferred financing costs	(3,629)	(5,866)	(7,206)
Capital contributions	58,473	969,468	58,710
Distributions to partners	(287,589)	(249,778)	(239,814)
Net cash (used in) provided by financing activities	(321,901)	1,005,766	12,690
Net (decrease) increase in cash and cash equivalents	(91,754)	123,817	17,187
(Decrease) increase in cash and cash equivalents related to foreign currency translation	(2,314)	1,241	2,965
Cash and cash equivalents at beginning of year	163,414	38,356	18,204
Cash and cash equivalents at end of year	$ 69,346	$ 163,414	$ 38,356

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The cash outflow for acquisition of buildings (properties) whether for investment or use.

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

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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 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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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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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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