Stockholders' Equity (Details) (USD $)	1 Months Ended	6 Months Ended		1 Months Ended			6 Months Ended		1 Months Ended	6 Months Ended
	Nov. 30, 2010	Jun. 30, 2011	Dec. 31, 2010	Mar. 31, 2005 Series A and B Cumulative Redeemable Preferred Stock	Apr. 30, 2011 Series A Cumulative Redeemable Preferred Stock	Apr. 30, 2006 Series A Cumulative Redeemable Preferred Stock	Jun. 30, 2011 Series A Cumulative Redeemable Preferred Stock	Mar. 17, 2010 Series A Cumulative Redeemable Preferred Stock	Apr. 30, 2011 Series D Cumulative Redeemable Preferred Stock	Jun. 30, 2011 Series D Cumulative Redeemable Preferred Stock	Apr. 06, 2016 Series D Cumulative Redeemable Preferred Stock	Jun. 30, 2011 Entity that owns Hilton San Diego Bayfront	Apr. 30, 2011 Entity that owns Hilton San Diego Bayfront	Jun. 30, 2011 Doubletree Guest Suites Times Square	Mar. 31, 2011 Doubletree Guest Suites Times Square	Jan. 31, 2011 Doubletree Guest Suites Times Square	Jun. 30, 2011 BuyEfficient, LLC
Stockholders' equity
Aggregate cumulative redeemable preferred shares sold (in shares)				4,850,000					4,600,000
Number of shares of stock issued (in shares)	19,500,000				2,200,000
Dividend rate (as a percent)				8.00%			8.00%			8.00%
Liquidation preference (in dollars per share)				$ 25.00		$ 25.00	$ 25.00		$ 25.00	$ 25.00
Gross proceeds from sale of preferred stock				$ 121,300,000		$ 55,000,000			$ 115,000,000
Underwriting and other costs of the offering		4,062,000		3,800,000					4,062,000
Net proceeds from issuance of preferred stock				117,500,000					110,900,000
Gross proceeds from issuance of stock		115,000,000				54,200,000
Ownership interest acquired (as a percent)												75.00%	75.00%	62.00%	62.00%	62.00%	50.00%
Redemption price (in dollars per share)							$ 25.00	$ 25.00			$ 25.00
Number Of days after first date of change of control within which the entity may redeem the preferred stock										120
Number of quarters preferred stock dividends must be in arrears before preferred stockholders have certain voting rights							6			6
Number of additional directors preferred stockholders will be entitled to vote for if dividends are in arrears for six or more quarterly periods							2			2
Maximum number of common shares into which preferred shares can be converted (in shares)										22,571,280
Common Stock
Number of shares of common stock issued (in shares)		117,242,818	116,950,504
Number of shares of stock issued (in shares)	19,500,000				2,200,000
Ownership interest acquired (as a percent)												75.00%	75.00%	62.00%	62.00%	62.00%	50.00%
Proceeds from issuance of common stock	$ 190,600,000