Capital and Financing Transactions (Details) (USD $)	9 Months Ended									9 Months Ended		9 Months Ended				9 Months Ended			9 Months Ended					9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 30, 2012	Dec. 31, 2011	Jan. 09, 2012 111 East Wacker [Member]	Sep. 30, 2012 Hayden Ferry Lakeside II [Member] sqft	May 31, 2012 The Pinnacle at Jackson Place [Member]	Sep. 30, 2012 Mortgages [Member]	Jan. 09, 2012 Mortgages [Member] 111 East Wacker [Member]	Sep. 30, 2012 Mortgages [Member] The Pointe [Member]	Jan. 11, 2012 Mortgages [Member] The Pointe [Member]	Sep. 30, 2012 Mortgages [Member] Hayden Ferry Lakeside II [Member]	Feb. 10, 2012 Mortgages [Member] Hayden Ferry Lakeside II [Member] sqft	Mar. 09, 2012 Mortgages [Member] Bank of America Plaza [Member] sqft	May 31, 2012 Mortgages [Member] The Pinnacle at Jackson Place [Member]	Sep. 30, 2012 Mortgages [Member] Fund I Assets [Member]	Sep. 30, 2012 Minimum [Member]	Feb. 10, 2012 Minimum [Member] Mortgages [Member] Hayden Ferry Lakeside II [Member]	Sep. 30, 2012 Maximum [Member]	Feb. 10, 2012 Maximum [Member] Mortgages [Member] Hayden Ferry Lakeside II [Member]	Sep. 30, 2012 New Facilities [Member]	Sep. 30, 2012 New Facilities [Member] Minimum [Member]	Sep. 30, 2012 New Facilities [Member] Maximum [Member]	Sep. 30, 2012 Term Loan [Member]	Sep. 30, 2012 Term Loan [Member] Minimum [Member]	Sep. 30, 2012 Term Loan [Member] Maximum [Member]	Sep. 30, 2012 Senior Unsecured Revolving Credit Facility [Member]	Sep. 30, 2012 Working Capital Revolving Credit Facility [Member]	Oct. 10, 2012 Accordion Feature [Member]	Sep. 30, 2012 Accordion Feature [Member] Minimum [Member]	Sep. 30, 2012 Accordion Feature [Member] Maximum [Member]
Line of Credit Facility [Line Items]
Number of banks in the consortium	9		8
Maximum borrowing capacity	$ 215,000,000																				$ 200,000,000			$ 125,000,000			$ 190,000,000	$ 10,000,000
Expiration date prior to modification	Jan. 31, 2014
Expiration date subsequent to modification	Mar. 29, 2016																							Sep. 27, 2017
Optional period to extend term of facility	1 year 0 months 0 days
Size of the accordion feature																								250,000,000						50,000,000	160,000,000
Amount of accordion feature exercised																													25,000,000
Variable rate basis	LIBOR											LIBOR
Basis spread on variable rate (in hundredths)																		250.00%		350.00%		160.00%	235.00%		150.00%	225.00%
Commitment fee (in hundredths)																	25.00%		35.00%
Amount outstanding under credit facilities	125,000,000
Debt Instrument [Line Items]
Mortgage notes payable	549,429,000			498,012,000
Mortgage notes payable footnote disclosure								549,400,000			23,500,000		50,000,000	16,300,000	29,500,000
Weighted average interest rate (in hundredths)								5.50%
Interest rate on mortgage (in hundredths)									6.30%		4.00%			7.10%	5.20%			4.00%		5.00%
Gross Sales Price					150,600,000		29,500,000
Debt assumed by buyer on sale of real estate									147,900,000							76,700,000
Maturity Date of Debt									July 2016		February 2019		July 2018	May 2012
Interest only period of mortgage (in months)										0 years 42 months 0 days
Proportionate share of mortgage loan													15,000,000
Area of real estate property (in square feet)						300,000							300,000	337,000
Variable rate basis	LIBOR											LIBOR
Basis spread on variable rate (in hundredths)																		250.00%		350.00%		160.00%	235.00%		150.00%	225.00%
Repayments of non-recourse mortgage loan	22,390,000	103,792,000
Number of Fund assets sold																4
Parkway's portion of debt assumed by buyer																$ 19,200,000