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

Transactions With Parkway Properties, Inc. (Additional Information) (Details)	Oct. 07, 2016 Rate	Oct. 06, 2016 Rate
Business Acquisition [Line Items]
Stock conversion ratio	12.50%
Parkway
Business Acquisition [Line Items]
Stock conversion ratio		163.00%