Area of building acquired.

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Debt defeasance cost associated with the prepayment of debt.

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Debt instrument fixed monthly payment maturity period.

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Debt instrument issued price percentage of principal.

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Debt instrument stated LIBOR floor rate.

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Expected project completion period.

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The additional borrowing capacity under the line of credit facility.

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Mortgage loan maturity date.

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Number of non core government leased properties.

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Number of properties acquired.

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Number of properties pledged.

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Percentage of capital stock of foreign subsidiary secured by pledge under revolving credit facilities.

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Percentage of loan to value of certain specified real property assets secured by first lien under term loan facilities.

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Percentage of senior notes offer price in connection with an asset sale.

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Percentage of senior notes offer price in connection with change in control.

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Represents the selling price of a real estate investment property.

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Sublimit for issuance of standby letters of credit.

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Subsidiary ownership percentage.

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Short-Term financing which is expected to be paid back relatively quickly, such as by a subsequent longer-term loan. Also called swing loan or bridge financing.

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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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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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Amount of payment greater than the preceding installment payments to be paid at final maturity date of debt.

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No definition available.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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

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No definition available.

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

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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 borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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The cash outflow for loan origination associated cost which is usually collected through escrow.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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The cash inflow from the sale of formerly productive land held for sale, anything permanently fixed to it, including buildings, structures on it, and so forth.

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Debt - Additional Information (Detail)									1 Months Ended			12 Months Ended
Debt - Additional Information (Detail)	Dec. 23, 2020 USD ($) Property	Jan. 02, 2020 USD ($) Property	Dec. 18, 2019 USD ($)	Aug. 23, 2018 USD ($) ft²	Jul. 17, 2018 USD ($) Property	Apr. 20, 2018 USD ($)	Apr. 17, 2018 USD ($)	Jan. 19, 2018 USD ($) ft²	Oct. 31, 2017 USD ($)	Sep. 30, 2015 USD ($)	Apr. 30, 2013 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($) Property	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt maturity period							Apr. 30, 2023
Borrowings outstanding under credit facility												$ 219,000,000.0
Revolving Credit Facility letters of credit outstanding												14,800,000		$ 22,300,000
Total debt												1,809,517,000		1,986,865,000
Debt Instrument outstanding balance												1,809,517,000		1,986,865,000
Unamortized original issue discount												10,000,000		12,500,000
Purchase price of real estate		$ 83,200,000			$ 12,000,000.0
Business acquisition assumed in-place financing		$ 52,200,000										52,217,000	$ 157,280,000
Number of properties acquired \| Property	28	28			12								15
Debt assumed on acquisition of property		$ 52,200,000										$ 52,217,000	$ 157,280,000
Real estate investment property aggregate selling price	$ 106,500,000
Percentage of Senior Notes offer price in connection with an asset sale												100.00%
Percentage of Senior Notes offer price in connection with change in control												101.00%
GRES
Debt Instrument [Line Items]
Number of properties acquired \| Property		24
Combined Subsidiary Guarantors
Debt Instrument [Line Items]
Ownership percentage of subsidiaries												100.00%
Capital Commerce Center
Debt Instrument [Line Items]
Area of Building Acquired \| ft²								261,000
Purchase price of real estate								$ 44,700,000
Non-Recourse Mortgage Note \| Capital Commerce Center
Debt Instrument [Line Items]
Debt Instrument outstanding balance														20,900,000
Debt instrument, term								15 years
Stated interest rate								4.50%
Capitalized loan costs								$ 400,000
Amount of acquisition financed with non-recourse mortgage note								$ 24,500,000
Mortgage note maturity date								2033-01
Non-Recourse Senior Secured Notes \| Private Placement
Debt Instrument [Line Items]
Debt maturity date						Jan. 31, 2040
Debt Instrument outstanding balance												$ 157,600,000
Debt instrument, term						20 years
Aggregate principal amount						$ 159,500,000
Stated interest rate						4.43%
Expected project completion period						January 2020
Notes issuance costs						$ 3,400,000
Non-Recourse Senior Secured Notes \| SSA-Baltimore
Debt Instrument [Line Items]
Debt maturity date				Feb. 28, 2034
Debt Instrument outstanding balance												144,500,000
Stated interest rate				4.50%
Area of Building Acquired \| ft²				541,000
Purchase price of real estate				$ 242,000,000
Notes issuance costs				200,000
Business acquisition assumed in-place financing				157,300,000
Balloon payment				40,000,000.0
Debt assumed on acquisition of property				$ 157,300,000
Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 1,000,000,000.0
Debt maturity period							Apr. 30, 2023
Line of credit facility, aggregate principal amount of additional borrowing							$ 350,000,000.0
Percentage of capital stock of foreign subsidiary secured by pledge under Revolving Credit Facilities							65.00%
Credit Agreement \| Term Loan A Due in April 2023
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 200,000,000.0
Term Loan A Due in April 2023
Debt Instrument [Line Items]
Total debt												$ 180,000,000.0
Debt maturity date							Apr. 30, 2023					Apr. 30, 2023
Debt Instrument outstanding balance												$ 180,000,000		190,000,000
Term Loan B Due in December 2024
Debt Instrument [Line Items]
Total debt												$ 237,500,000
Debt maturity date			Dec. 31, 2024									Dec. 31, 2024
Debt Instrument outstanding balance			$ 250,000,000.0									$ 237,500,000		250,000,000
Debt instrument, term			5 years
Percentage of loan to value of certain specified real property assets secured by a first lien			80.00%
Debt instrument, issued price percentage of principal			95.00%
Unamortized original issue discount			$ 12,500,000
Capitalized loan costs			$ 5,100,000
Term Loan B Due in December 2024 \| Base Rate
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate			3.50%
Term Loan B Due in December 2024 \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate			4.50%
Libor floor rate			1.00%
Senior Notes 4.125% Due 2020
Debt Instrument [Line Items]
Aggregate principal amount			$ 325,000,000.0
Stated interest rate			4.125%
Debt instrument redemption percentage of par											100.00%
Senior Notes 4.625% Due 2023
Debt Instrument [Line Items]
Debt maturity date											May 01, 2023	May 31, 2023
Debt Instrument outstanding balance												$ 350,000,000		350,000,000
Aggregate principal amount											$ 350,000,000.0
Stated interest rate											4.625%	4.625%
Debt instrument redemption percentage of par											100.00%
Senior Notes 5.0% Due 2022
Debt Instrument [Line Items]
Debt maturity date										Oct. 15, 2022		Oct. 31, 2022
Debt Instrument outstanding balance												$ 250,000,000		250,000,000
Aggregate principal amount										$ 250,000,000.0
Stated interest rate										5.00%		5.00%
Debt instrument redemption percentage of par										100.00%
Senior Notes 4.75% Due 2027
Debt Instrument [Line Items]
Debt maturity date									Oct. 15, 2027			Oct. 31, 2027
Debt Instrument outstanding balance												$ 250,000,000		$ 250,000,000
Aggregate principal amount									$ 250,000,000.0
Stated interest rate									4.75%			4.75%
Debt instrument redemption percentage of par									100.00%
Government Real Estate Solutions Non-Recourse Mortgage Note 4.91% maturing November 2025
Debt Instrument [Line Items]
Stated interest rate		4.91%
Purchase price of real estate		$ 83,200,000
Business acquisition assumed in-place financing		52,200,000
Balloon payment		$ 46,200,000
Number of properties acquired \| Property		28
Debt assumed on acquisition of property		$ 52,200,000
Debt instrument fixed monthly payment maturity period		Nov. 30, 2025
Number of properties pledged \| Property	24	24
Number of non-core government leased properties \| Property	42
Real estate investment property aggregate selling price	$ 106,500,000
Proceeds from sale of property held for sale	27,800,000
Debt defeasance cost	$ 10,500,000
Government Real Estate Solutions Non-Recourse Mortgage Note 4.91% maturing November 2025 \| GRES
Debt Instrument [Line Items]
Number of properties acquired \| Property		24
Revolving Credit Facility
Debt Instrument [Line Items]
Sublimit swing line loans							$ 30,000,000.0
Percentage of commitment fee to unfunded balance												0.35%
Line of credit facility, remaining borrowing capacity												$ 566,200,000
Sublimit for issuance of standby letters of credit							$ 50,000,000.0
Revolving Credit Facility letters of credit outstanding												$ 14,800,000
Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate												0.50%
Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate							0.00%
Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate							1.00%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate												1.50%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate							1.00%
Revolving Credit Facility \| London Interbank Offered Rate (LIBOR) \| Maximum
Debt Instrument [Line Items]
Debt instrument, percentage points added to reference rate							2.00%
Revolving Credit Facility \| Credit Agreement
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 800,000,000.0