Contractual Obligations (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012
Contingencies And Commitments [Line Items]
2012	$ 2.0
2013	8.2
2014	7.7
2015	81.6
2016	1.2
2017	1.2
Thereafter	10.7
Total	112.6
Mortgage notes payable and related interest
Contingencies And Commitments [Line Items]
2012	1.8
2013	7.5
2014	7.5
2015	81.4
2016	1.0
2017	1.0
Thereafter	10.3
Total	110.5
Base Service Fee Obligations
Contingencies And Commitments [Line Items]
2012	0.1	[1]
2013	0.5	[1]
2014		[1]
2015		[1]
2016		[1]
2017		[1]
Thereafter		[1]
Total	0.6	[1]
Operating Lease Obligations
Contingencies And Commitments [Line Items]
2012	0.1	[2]
2013	0.2	[2]
2014	0.2	[2]
2015	0.2	[2]
2016	0.2	[2]
2017	0.2	[2]
Thereafter	0.4	[2]
Total	$ 1.5	[2]

[1] TREIT base service fee, subject to increase or decrease based on changes in shareholders' equity. The termination fee payable to TREIT in the event of non-renewal of the Services Agreement by the Company is not fixed and determinable and is therefore not included in the table.

[2] Minimum rental obligations for Company office lease.