Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			12 Months Ended				1 Months Ended		1 Months Ended			1 Months Ended
	Sep. 30, 2012 Property	Jun. 30, 2012 Property	Mar. 31, 2012 Property	Dec. 31, 2011 Property	May 16, 2012 Hilton Garden Inn	Feb. 28, 2012 Hilton Garden Inn	May 25, 2011 Hilton Garden Inn	Oct. 02, 2012 Subsequent Event	Oct. 23, 2012 Subsequent Event Hilton Garden Inn Room	Oct. 30, 2012 Subsequent Event Hyatt Place	Oct. 05, 2012 Subsequent Event Business Acquisitions Property Room	Oct. 11, 2012 Subsequent Event Compass Bank Loan	Oct. 03, 2012 Subsequent Event Public Offering
Subsequent Event [Line Items]
Common Units redeemed								858,433
Shares issued through public offering													13,800,000
Net proceeds form shares issued through public offering													$ 107.0
Principal balance of the Compass Bank loan, hedged amount												12.1
Fixed interest rate												4.57%
Number of guestrooms									98		1,043
Number of hotels acquired	1	3	3	5							8
Purchase price of acquired entity					11.5	11.5	13.4		7.2		87.4
Loans receivable										$ 20
Property conversion, estimated completion year										2013