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

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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.

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Amount of decrease in line of credit facility from forgiveness by the holder of the line of credit.

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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.

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Amount of long-term loans payable classified as other.

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Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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BORROWING ARRANGEMENTS (Omega Credit, Omega OP Term and Amended 2015 Term Loan Facilities) (Detail) $ in Thousands, £ in Millions					1 Months Ended		12 Months Ended
	May 17, 2019 USD ($)	May 24, 2017 USD ($)	Apr. 05, 2017 USD ($)	Dec. 16, 2015 USD ($)	Sep. 30, 2019 USD ($)	May 25, 2017 GBP (£)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	May 25, 2017 USD ($)
Debt Instrument [Line Items]
Long-term line of credit							$ 125,000	$ 313,000
Term loans - net							804,738	898,726
Repayment of revolving credit facility							1,980,100	1,268,000	$ 1,587,000
Write-off of deferred financing costs									10,195
Revolving Credit Facility
Debt Instrument [Line Items]
Description of variable rate basis						LIBOR
Senior Unsecured Revolving And Term Loan Credit Facility 2017 [Member]
Debt Instrument [Line Items]
Credit Facility Maximum Capacity										$ 1,800,000
Omega Credit Facilities 2017 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity										2,500,000
Revolving credit facility to be drawn in Alternative Currencies or U.S. Dollars in tranche one										900,000
Revolving credit facility to be drawn in Alternative Currencies or U.S. Dollars in tranche two										350,000
Sterling term loan
Debt Instrument [Line Items]
Description of variable rate basis						LIBOR
Tranche A One Term Loan Member
Debt Instrument [Line Items]
Term loan/facility terminated		$ 200,000
Tranche A Two Term Loan Member
Debt Instrument [Line Items]
Term loan/facility terminated			$ 200,000
Tranche A Three Term Loan Member
Debt Instrument [Line Items]
Term loan/facility terminated		350,000
Senior Unsecured 2014 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term line of credit		$ 1,250,000
Long-term Debt, Gross										550,000
Omega Credit Facilities 2014 [Member]
Debt Instrument [Line Items]
Write-off of deferred financing costs									$ 5,500
Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Description of variable rate basis						LIBOR
Long-term Debt, Gross										150,000
2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Description of variable rate basis						LIBOR
Amount of guaranty of unsecured indebtedness										50,000
Repayment of notes payable					$ 25,000
Interest Rate Swap [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Term loans - net	$ 75,000
Rate	3.29%
Maturity date	Feb. 10, 2022
Interest Rate Swap [Member] \| 2017 Omega OP Term Loan Facility \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	0.45%
Interest Rate Swap [Member] \| 2017 Omega OP Term Loan Facility \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	0.55%
Secured Debt [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Term loans - net							75,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Term loans - net							804,738	898,726
Unsecured debt							$ 4,746,460	4,540,622
Unsecured Debt [Member] \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term line of credit										1,250,000
Maturity date							May 25, 2021
Unsecured Debt [Member] \| Minimum \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate						1.00%
Unsecured Debt [Member] \| Maximum \| Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate						1.95%
Unsecured Debt [Member] \| Revolving Credit Facility
Debt Instrument [Line Items]
Long-term line of credit							$ 125,000	313,000
Rate							2.99%
Unsecured Debt [Member] \| U.S. term loan
Debt Instrument [Line Items]
Term loans - net							$ 350,000	425,000		425,000
Rate							3.25%
Unsecured Debt [Member] \| U.S. term loan \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						0.90%
Unsecured Debt [Member] \| U.S. term loan \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						1.90%
Unsecured Debt [Member] \| US Term Loan And Sterling Term Loan [Member]
Debt Instrument [Line Items]
Description of variable rate basis						LIBOR
Maturity date							May 25, 2022
Unsecured Debt [Member] \| Sterling term loan
Debt Instrument [Line Items]
Term loans - net						£ 100	$ 132,480	127,990
Rate							2.16%
Unsecured Debt [Member] \| Sterling term loan \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						0.90%
Unsecured Debt [Member] \| Sterling term loan \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						1.90%
Unsecured Debt [Member] \| Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Term loans - net				$ 250,000			$ 250,000	250,000		250,000
Rate							3.80%
Maturity date						Dec. 16, 2022
Maximum aggregate principal amount available under credit facility										150,000
Amount of guaranty of unsecured indebtedness										50,000
Unsecured Debt [Member] \| Amended 2015 Term Loan Facility \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						1.40%
Unsecured Debt [Member] \| Amended 2015 Term Loan Facility \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						2.35%
Unsecured Debt [Member] \| 2017 Omega OP Term Loan Facility
Debt Instrument [Line Items]
Term loans - net							$ 75,000	$ 100,000		$ 100,000
Rate							3.29%
Maturity date						May 25, 2022
Unsecured Debt [Member] \| 2017 Omega OP Term Loan Facility \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate						0.90%
Unsecured Debt [Member] \| 2017 Omega OP Term Loan Facility \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate						1.90%
Unsecured Debt [Member] \| Interest Rate Swap [Member] \| Amended 2015 Term Loan Facility
Debt Instrument [Line Items]
Description of variable rate basis				one-month LIBOR
Rate				3.8005%
Maturity date				Dec. 15, 2022
Unsecured Debt [Member] \| Interest Rate Swap [Member] \| Amended 2015 Term Loan Facility \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate				0.40%
Unsecured Debt [Member] \| Interest Rate Swap [Member] \| Amended 2015 Term Loan Facility \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate				0.55%