Represents the maximum amount that can converted to term loans under the revolving credit facility.

No definition available.

Name:	sho_LineOfCreditFacilityRevolvingCreditConversionToTermLoan
Namespace Prefix:	sho_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the number of extension periods available for unsecured debt.

+ References

No definition available.

+ Details

Name:	sho_NumberOfExtensionPeriodsForUnsecuredDebt
Namespace Prefix:	sho_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the number of hotel subsidiaries whose interests are pledged to the credit facility.

+ References

No definition available.

+ Details

Name:	sho_NumberOfHotelSubsidiariesWhoseInterestsArePledgedToCreditFacility
Namespace Prefix:	sho_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the term of an unsecured debt's extension period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	sho_TermOfExtensionPeriodForUnsecuredDebt
Namespace Prefix:	sho_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDateRangeEnd1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityIncreaseDecreaseNetAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

+ Details

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

- Definition

The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is uncollateralized (where debt is not backed by the pledge of collateral).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromUnsecuredLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfUnsecuredDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Period Type:

Notes payable - Credit Facility (Details)			1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
Notes payable - Credit Facility (Details)	Jun. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) item	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) item	Jun. 30, 2020 USD ($) item property	Dec. 31, 2019 USD ($)
Unsecured revolving credit facility
Proceeds from credit facility						$ 300,000,000
Payment on credit facility						$ 250,000,000
Interest rate added to base rate (as a percent)					1.40%
Interest rate on credit facility	1.57%		1.57%		1.57%	1.57%
Unsecured revolving credit facility
Unsecured revolving credit facility
Proceeds from credit facility				$ 300,000,000.0
Payment on credit facility			$ 250,000,000.0
Outstanding balance on credit facility	$ 50,000,000.0		$ 50,000,000.0		$ 50,000,000.0	$ 50,000,000.0
Interest rate, description of reference rate				one-month LIBOR		one-month LIBOR
Credit facility expiration date					Apr. 14, 2023	Apr. 14, 2023	Apr. 14, 2023
Number of credit facility extension periods	2	2	2		2	2	2
Term of extension period for unsecured debt	6 months	6 months			6 months
Credit facility expiration date after extensions	Apr. 14, 2024	Apr. 14, 2024			Apr. 14, 2024
Remaining borrowing capacity available	$ 450,000,000.0		$ 450,000,000.0		$ 450,000,000.0	$ 450,000,000.0
Maximum amount of term loans available	$ 115,000,000.0
Number of hotel subsidiaries whose interests are pledged to the credit facility \| property						14
Unsecured revolving credit facility \| Minimum
Unsecured revolving credit facility
Interest rate added to base rate (as a percent)						1.40%
Unsecured revolving credit facility \| Maximum
Unsecured revolving credit facility
Interest rate added to base rate (as a percent)						2.25%