Segment Information - Reconciliation of GAAP Net Income to NOI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting [Abstract]
Net income applicable to Piedmont	$ 7,966	$ 9,947	$ 67,930	$ 19,291
Management fee revenue	(203)	(247)	(565)	(637)
Depreciation and amortization	53,852	50,691	107,619	101,706
General and administrative expenses	7,027	8,211	14,622	15,462
Interest expense	13,775	12,345	27,673	24,925
Other income	273	(2,162)	(1,536)	(4,302)
Gain on sale of real estate assets	(1)	0	(50,674)	0
Net loss applicable to noncontrolling interests	(1)	(3)	(1)	(4)
NOI	$ 82,688	$ 78,782	$ 165,068	$ 156,441