Commitments and Contingencies - Concentration of Risk and Other (Details) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017 USD ($) property	Mar. 31, 2017 USD ($) property
Concentration of Risk
Number of hotels which are held for investment	27	27
Other
Term of unsecured environmental indemnities	0 years
Damage limitation of unsecured environmental indemnities \| $	$ 0
California
Concentration of Risk
Number of hotels which are held for investment	7	7
Illinois
Concentration of Risk
Number of hotels which are held for investment	3	3
Massachusetts
Concentration of Risk
Number of hotels which are held for investment	3	3
Greater Washington DC Area
Concentration of Risk
Number of hotels which are held for investment	3	3
Percentage of total rooms \| California
Concentration of Risk
Concentration risk (as a percent)	29.00%
Percentage of total rooms \| Illinois
Concentration of Risk
Concentration risk (as a percent)	9.00%
Percentage of total rooms \| Massachusetts
Concentration of Risk
Concentration risk (as a percent)	15.00%
Percentage of total rooms \| Greater Washington DC Area
Concentration of Risk
Concentration risk (as a percent)	14.00%
Percentage of total revenue generated by hotels \| California
Concentration of Risk
Concentration risk (as a percent)		34.00%
Percentage of total revenue generated by hotels \| Illinois
Concentration of Risk
Concentration risk (as a percent)		7.00%
Percentage of total revenue generated by hotels \| Massachusetts
Concentration of Risk
Concentration risk (as a percent)		15.00%
Percentage of total revenue generated by hotels \| Greater Washington DC Area
Concentration of Risk
Concentration risk (as a percent)		14.00%
Workers' compensation insurance programs
Other
Outstanding irrevocable letters of credit \| $	$ 500	$ 500
Draws on letters of credit \| $	$ 0

Represents the damage limitation of unsecured environmental indemnities.

No definition available.

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

- Definition

Represents the term of unsecured environmental indemnities.

+ References

No definition available.

+ Details

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

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

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

+ References

No definition available.

+ Details

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

- References

No definition available.

+ Details

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

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for the settlement of obligation drawn 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 maturities due beyond one year or the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585

+ Details

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

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=stpr_IL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=stpr_MA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=sho_GreaterWashingtonDCAreaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=sho_NumberOfRoomsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueServicesNetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LossContingenciesByNatureOfContingencyAxis=sho_WorkersCompensationInsuranceProgramsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: