Summary of Significant Accounting Policies - Rental Revenue (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Straight line rent receivable, net	$ 56,702	$ 47,599
Allowance against straight line rent	$ 200	$ 4,900

Represents the straight line rent receivable as of the reporting date.

No definition available.

Name:	doc_StraightLineRentReceivable
Namespace Prefix:	doc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant