Consolidated Statement Of Equity - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Paid-In Capital [Member]	Cumulative Net Income [Member]	Cumulative Distributions [Member]	Total PS Business Parks, Inc.'s Shareholders' Equity [Member]	Noncontrolling Interests [Member]	Total
Balances, value at Dec. 31, 2014	$ 995,000	$ 268	$ 709,008	$ 1,244,946	$ (1,235,941)	$ 1,713,281	$ 194,928	$ 1,908,209
Balances, shares at Dec. 31, 2014	39,800	26,919,161
Exercise of stock options, value			2,000			2,000		$ 2,000
Exercise of stock options, shares		39,500						39,500
Stock compensation, net, value			4,229			4,229		$ 4,229
Stock compensation, net, shares		13,224
Net income				61,285		61,285	8,379	69,664
Distributions:
Preferred stock					(30,244)	(30,244)		(30,244)
Common stock					(26,948)	(26,948)		(26,948)
Noncontrolling interests							(7,305)	(7,305)
Adjustment to noncontrolling interests in underlying operating partnership			(1,055)			(1,055)	1,055
Balances, value at Jun. 30, 2015	$ 995,000	$ 268	$ 714,182	$ 1,306,231	$ (1,293,133)	$ 1,722,548	$ 197,057	$ 1,919,605
Balances, shares at Jun. 30, 2015	39,800	26,971,885