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Debt - Additional Information (Detail) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 19, 2022 USD ($) | Oct. 07, 2021 USD ($) | Mar. 17, 2021 USD ($) | Mar. 31, 2023 USD ($) Property | Dec. 31, 2022 Property | May 25, 2022 USD ($) | Apr. 15, 2021 | Mar. 16, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Weighted average interest rate on debt |  |  |  | 5.82% |  |  |  |
Initial maximum amount available |  | $ 700 |  |  |  |  |  |
Number of operating properties | Property |  |  |  | 99 |  |  |  |
SSGT II Merger Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of operating properties | Property |  |  |  |  | 10 |  |  |
Key Bank [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial maximum amount available |  |  | $ 850 |  |  |  |  | $ 500
Additional amount available under credit facility |  |  | 350 |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility cross default provision amount |  |  | $ 75 |  |  |  |  |
2032 Private Placement Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate | 4.53% |  |  |  |  |  |  |
Debt instrument, maturity date | Apr. 19, 2032 |  |  |  |  |  |  |
Aggregate principal amount of notes issued | $ 75 |  |  |  |  | $ 75 |  |
Interest Accruing On Notes |  |  |  | 5.28% |  |  |  |
Prepayment of Notes | 100.00% |  |  |  |  |  |  |
Debt Instrument Fixed Rate |  |  |  | 4.53% |  |  |  |
2032 Private Placement Notes | 4.53% Senior Notes[Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issued | $ 150 |  |  |  |  |  |  |
2032 Private Placement Notes | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ratio of Total Indebtedness | 0.0700 |  |  |  |  |  |  |
Leverage Ratio | 7.00% |  |  |  |  |  |  |
2032 Private Placement Notes | Minimum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Ratio of Total Indebtedness | 0.0100 |  |  |  |  |  |  |
Leverage Ratio | 1.00% |  |  |  |  |  |  |
Prepayment of Notes | 5.00% |  |  |  |  |  |  |
Midland North Carolina CMBS Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of operating properties | Property |  |  |  |  | 11 |  |  |
KeyBank SST IV CMBS Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  | Feb. 01, 2030 |  |  |  |  |
SST IV TCF Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of operating properties | Property |  |  |  |  | 5 |  |  |
Credit Facility Revolver |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, annual unused fee |  |  |  | 230.00% |  |  |  |
Line of credit facility, current borrowing capacity |  | 450 |  | $ 450 |  |  |  |
Increased the principal borrowing amount |  | 200 |  |  |  |  |  |
Amount borrowed under the credit facility |  |  |  | $ 393 |  |  |  |
Credit Facility Revolver | Key Bank [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding balance on credit facility |  |  | $ 250 |  |  |  |  |
Maturity date |  |  | Mar. 17, 2024 |  |  |  |  |
Line of credit facility, term of extension options |  |  | 1 year |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  | 185 basis points spread over Daily Simple SOFR plus an additional 10 basis points (the SOFR Index Adjustment) or 30-day CDOR |  |  |  |
Credit Facility Revolver | Maximum | Key Bank [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, annual unused fee |  |  |  | 0.25% |  |  |  |
Credit Facility Revolver | Maximum | Key Bank [Member] | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility sublimits |  |  | $ 25 |  |  |  |  |
Credit Facility Revolver | Maximum | Key Bank [Member] | Swingline Loans |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Credit facility sublimits |  |  | 25 |  |  |  |  |
Credit Facility Revolver | Minimum | Key Bank [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, annual unused fee |  |  |  | 0.15% |  |  |  |
Credit Facility Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, annual unused fee |  |  |  | 225.00% |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  | $ 250 |  |  |  |
Amount borrowed under the credit facility |  |  |  | $ 250 |  |  |  |
Credit Facility Term Loan | Key Bank [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding balance on credit facility |  |  | $ 250 |  |  |  |  |
Maturity date |  |  | Mar. 17, 2026 |  |  |  |  |
Line of credit facility, term of extension options |  |  | 0 years |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  | 180 basis points spread over daily simple SOFR plus an additional 10 basis points (the "SOFR Index Adjustment") or 30-day Canadian dollar offered rate ("CDOR") |  |  |  |
Accordion Feature |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial maximum amount available |  | 1,050 |  |  |  |  |  |
Additional amount available under credit facility |  | $ 350 |  |  |  |  |  |
BMO Loan | Oakville III Property | CDOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 2.25% |
Credit facility agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, annual unused fee |  |  |  | 60.00% |  |  |  |

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