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Related Party Transactions - Narrative (Details) - Pillarstone OP [Member] $ in Millions	Dec. 08, 2016 USD ($)
Related Party Transaction [Line Items]
Financed receivable due from related party	$ 15.4
Minimum [Member] | LIBOR Rate
Related Party Transaction [Line Items]
Financing receivable, basis spread on variable rate	1.40%
Maximum [Member] | LIBOR Rate
Related Party Transaction [Line Items]
Financing receivable, basis spread on variable rate	1.95%

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- Definition

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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No definition available.

+ Details

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

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- Definition

Financing Receivable, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

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Namespace Prefix:	wsr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Financing Receivable, Related Parties

+ References

No definition available.

+ Details

Name:	wsr_FinancingReceivableRelatedParties
Namespace Prefix:	wsr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: