Summary of Significant Accounting Policies (Details) (Marriott)	3 Months Ended
	Dec. 31, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010
Marriott
Reporting Periods
Weeks reported in quarter (in weeks)		12	12		12	12	12
Weeks reported in fourth quarter, low end of range (in weeks)	16			16
Weeks reported in fourth quarter, high end of range (in weeks)	17