Stockholders' Equity (Details) (USD $)	3 Months Ended	1 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Jun. 30, 2012 Hyatt Chicago Magnificent Mile	Mar. 31, 2013 Series A Cumulative Redeemable Preferred Stock	Mar. 31, 2013 Series A Cumulative Redeemable Preferred Stock	Dec. 31, 2012 Series A Cumulative Redeemable Preferred Stock	Mar. 31, 2013 Series D Cumulative Redeemable Preferred Stock item	Dec. 31, 2012 Series D Cumulative Redeemable Preferred Stock	Mar. 31, 2013 Series D Cumulative Redeemable Preferred Stock Maximum	Mar. 31, 2013 Series D Cumulative Redeemable Preferred Stock Minimum Q	Feb. 28, 2013 Common Stock	Jun. 30, 2012 Common Stock
Stockholders' equity
Number of shares redeemed			7,050,000	7,050,000
Number of shares of stock issued			0	0	7,050,000	4,600,000	4,600,000
Dividend rate (as a percent)					8.00%	8.00%	8.00%
Amount paid to redeem Series A preferred stock			$ 178,600,000	$ 178,600,000
Accrued dividends paid on redemption			2,300,000	2,300,000
Additional redemption charges				4,600,000
Preferred stock, outstanding shares			0	0	7,050,000	4,600,000	4,600,000
Liquidation preference (in dollars per share)					$ 25.00	$ 25.00	$ 25.00
Future redemption price (in dollars per share)						$ 25.00
Number of days after first date of change of control within which the entity may redeem the preferred stock								120 days
Number of quarters preferred stock dividends must be in arrears before preferred stockholders have certain voting rights									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
Number of common shares which preferred stockholders may convert their shares into upon a change of control								22,571,280
Number of shares issued		5,454,164
Underwriting and other costs of the offering	376,000	100,000
Net proceeds from issuance of common stock	$ 294,875,000									$ 294,900,000	$ 126,200,000
Issuance of common stock, net (in shares)										25,300,000	12,143,273
Number of shares of the underwriters' over-allotment issued (in shares)										3,300,000