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Debt - Summary of Borrowings (Parenthetical) (Detail)							12 Months Ended
Debt - Summary of Borrowings (Parenthetical) (Detail)	Jan. 23, 2024	May 30, 2023	Feb. 03, 2023 USD ($) Swap	Jan. 26, 2023 USD ($)	Nov. 29, 2022	Oct. 27, 2022 USD ($)	Dec. 31, 2023 USD ($) Swap	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 20, 2023 USD ($)
Debt Instrument [Line Items]
Loan, interest rate		0.10%
Loan, Principal Outstanding							$ 1,299,597,000
Mortgage note obligation							20,002,000	$ 10,899,000	$ 4,233,000
MEPCOM Jacksonville [Member]
Debt Instrument [Line Items]
Mortgage note obligation						$ 5,800,000
DEA Pleasanton [Member]
Debt Instrument [Line Items]
Cash				$ 15,700,000
Mortgage note obligation				$ 15,700,000
Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Amount available under revolving credit facility										$ 50,000,000
Number of forward interest rate swaps \| Swap			2
Forward swaps effective date			Jun. 30, 2023
Aggregate notional value of interest rate swaps			$ 200,000,000				200,000,000			100,000,000
2018 Term Loan Facility [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 200,000,000	150,000,000
Amount available under revolving credit facility										50,000,000
2018 Term Loan Facility [Member] \| Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Number of forward interest rate swaps \| Swap							2
Forward swaps effective date							Jun. 23, 2023
Forward swaps interest rate							5.39%
2016 Term Loan Facility [Member]
Debt Instrument [Line Items]
Loan, interest rate					0.10%
Loan, Principal Outstanding							$ 100,000,000	100,000,000
2016 Term Loan Facility [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Extended maturity date	Jan. 30, 2025
2016 Term Loan Facility [Member] \| Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Aggregate notional value of interest rate swaps							$ 100,000,000
Forward swaps interest rate							5.05%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Amount available under revolving credit facility							$ 370,900,000			$ 50,000,000
Credit facility additional maximum borrowing capacity							$ 250,000,000
Line of Credit Facility, Description							revolving credit facility has two six-month as-of-right extension options subject to certain conditions and the payment of an extension fee.
Revolving Credit Facility [Member] \| Interest Rate Swaps [Member]
Debt Instrument [Line Items]
Number of forward interest rate swaps \| Swap							1
Forward swaps effective date							Sep. 29, 2023
Revolving Credit Facility [Member] \| 2018 Term Loan Facility [Member]
Debt Instrument [Line Items]
Amount available under revolving credit facility							$ 50,000,000.0
Mortgage Notes Payable [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							220,597,000	240,612,000
Mortgage Notes Payable [Member] \| CBP Savannah [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 9,549,000	10,389,000
Effective interest rate							4.12%
Mortgage Notes Payable [Member] \| ICE Charleston [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 11,998,000	13,441,000
Effective interest rate							3.93%
Mortgage Notes Payable [Member] \| USFS II Albuquerque [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 11,603,000	13,438,000
Effective interest rate							3.92%
Mortgage Notes Payable [Member] \| DEA Pleasanton [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding								15,700,000
Mortgage Notes Payable [Member] \| VA Loma Linda [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 127,500,000	127,500,000
Effective interest rate							3.78%
Mortgage Notes Payable [Member] \| VA Golden [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 8,447,000	8,644,000
Effective interest rate							5.03%
Mortgage Notes Payable [Member] \| USCIS – Kansas City
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 51,500,000	$ 51,500,000
Effective interest rate							2.05%
Senior Unsecured Notes [Member] \| 2018 Term Loan Facility [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 200,000,000
Senior Unsecured Notes [Member] \| 2016 Term Loan Facility [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							100,000,000
Senior Unsecured Notes [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Loan, Principal Outstanding							$ 450,000,000
LIBOR [Member]
Debt Instrument [Line Items]
Loan, interest rate							4.39%
SOFR [Member]
Debt Instrument [Line Items]
Loan, interest rate							5.31%
Number of forward interest rate swaps \| Swap			3
Aggregate notional value of interest rate swaps			$ 100,000,000