Indebtedness (Credit Facility) (Details)	12 Months Ended
Dec. 31, 2017 USD ($) extension	Dec. 31, 2016 USD ($)
Line of Credit Facility [Line Items]
Amount outstanding	$ 358,939,000	$ 0
Letter of credit obligations	$ 5,100,000
Credit Facility Group Lenders [Member]
Line of Credit Facility [Line Items]
Expiration date	Oct. 20, 2021
Number of maturity extensions \| extension	2
Length of maturity extension	6 months
Competitive bid percentage	50.00%
Borrowed funds for covenant ratio	$ 0.60
Covenant ratio	1.50
Debt covenant percentage	60.00%
Line of Credit Facility, Secured Debt to Total Asset Value, Maximum	35.00%
Unencumbered net operating income to unsecured interest expense value for debt covenant	175.00%
Credit Facility Group Lenders [Member] \| Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.875%
Commitment fee percentage	0.15%
Amount outstanding	$ 355,000,000
Maximum borrowing capacity	$ 800,000,000
Credit Facility Group Lenders [Member] \| Commercial Paper [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.95%
Amount outstanding	$ 0
Maximum borrowing capacity	100,000,000
Credit Facility Group Lenders [Member] \| Letter of Credit [Member]
Line of Credit Facility [Line Items]
Letter of credit obligations	$ 5,100,000
Working Capital Facility Lender [Member] \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.875%
Commitment fee percentage	0.15%
Expiration date	Oct. 20, 2021
Number of maturity extensions \| extension	2
Length of maturity extension	6 months
Amount outstanding	$ 3,900,000
Maximum borrowing capacity	$ 30,000,000

The length of a debt maturity extension in months or years.

No definition available.

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- Definition

Competitive Bid Option % of Facility Amount

+ References

No definition available.

+ Details

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- Definition

Earnings Before Interest, Taxes, Depreciation and Amortization

+ References

No definition available.

+ Details

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Unencumbered Net Operating Income to Unsecured Interest Expense, Minimum Debt Covenant

+ References

No definition available.

+ Details

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Namespace Prefix:	lry_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Unsecured Debt to Unencumbered Asset Value

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility, Secured Debt to Total Asset Value, Maximum

+ References

No definition available.

+ Details

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Namespace Prefix:	lry_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of maturity extensions on long-term debt available to the entity.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	instant

- Details

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- Details

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- Details

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- Details

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